Tampilkan postingan dengan label London Marathon. Tampilkan semua postingan
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Minggu, 17 April 2011

London Marathon Live

London 2011: Mutai and Keitany dominate

Emmanuel Mutai and Mary Keitany have won the 2011 London Marathon.  Mutai shattered the course record in running 2:04:40, which makes him the fourth fastest man in history (with the 5th fastest performance), while Keitany broke 2:20 in her second run.  For both, it was the manner in which the victory was achieved that was so impressive.

Men's race summary

The men's race, as is typical, was started with talk of a world record.  That prospect seemed doomed as early as 15km, when the 5km split was 15:03. That was followed by another 15:03 up to 20km, and the pace was never as fast as had been promised.

Halfway was hit in 62:44, projecting a 2:05:28, which was fast, but even this was a little misleading because the first 5km had been so quick.  Apart from those first 5km, the elite men were running closer to 2:06:30 pace.  In fact, the section from 5km to 30km was run at 2:59.4/km, or 2:06:11 pace, so the fast first 5km and a truly exceptional final 10km were responsible for that time!

The race was really shaken up around 30km though.  That's when Mutai hit the front, and the table below tells the story.  He burned up the roads of London, running 5km splits of 14:26 and 14:19 between 30 and 40km.  It was brutally fast, and no one was able to survive.  Martin Lel fought bravely with Patrick Makau in second, but Mutai opened 20 seconds at 35km and was 53 seconds clear at 40km.  The rest of the elite group was even more fragmented, pre-race favourite Kebede slipping over 2 minutes behind in this 10km stretch.

Mutai's final 12km were covered in 35:20, which is 2:54/km and 2:02 marathon pace!  That surge was enough to bring the overall time down enormously, and contribute to a 61:56 second half, which was the only negative split of the elite men's race.  Lel and Makau ran 63 minutes for the second half, everyone else was 64 minutes or longer.  Admittedly, many will have shut off having seen the win go away, exaggerating these times slightly.  So Mutai, who was second in London and New York last year, has gone one better by winning and a lot better by breaking 2:05 and joining a select group of marathon superstars. 

Women's race summary

Keitany, meanwhile, exploded onto the marathon scene, having started in New York last year, she's now established herself as perhaps THE woman to beat.  This is always the case when such a great half-marathon runner comes up, but the question mark is always whether they'll be able to translate their performances up.  Keitany answered that question with a resounding yes today, running an exceptional second half to win in 2:19:19.

The women hit halfway in 1:10:37, which was fast, but gave no indication of what was to happen.  It was pre-race Shobukhova who surged at halfway, but all that did was ignite Keitany, who went to the front and then never looked back.  A 16:09, 16:01 and a 16:14 followed for the next three 5km splits, and the gap was over 1 minute.

Keitany slowed slightly at the end, and Shobukhova bravely clawed back some of the time she'd lost, finishing in a PB of 2:20:15.  But it was an emphatic win for Keitany, who ran with such confidence.  Her second half was an incredible 68:42, a massive negative split set up by the fast section from 20 to 35km.  It also suggests more to come from Keitany, who must surely be capable of a sub-2:19, and it makes her the marathon runner to beat among the women.  With London 2012 on the horizon, the rest of the world will be taking notice!

Below are the splits, and below those tables are my "in-race" thoughts, as the race developed in chronological order.  As always, we'll be doing the same for Boston tomorrow, where ideal conditions should help set up another great race!  So join us then!

Splits


Men's Race
Distance Time Interval time Pace for interval Projected time
5 14:34 14:34 2:55 2:02:56
10 29:23 14:49 2:58 2:03:59
15 44:26 15:03 3:01 2:04:59
20 59:29 15:03 3:01 2:05:30
Halfway 1:02:44 2:05:28
25 1:14:16 14:47 2:57 2:05:21
30 1:29:20 15:04 3:01 2:05:39
35 1:43:36 14:26 2:53 2:05:06
40 1:58:08 14:19 2:52 2:04:34
Finish 2:04:40





Women's Race
Distance Time Interval time Pace for interval Projected time
5 16:16 16:16 3:15 2:17:16
10 32:54 16:38 3:20 2:18:49
15 49:50 16:56 3:23 2:20:11
20 1:07:01 17:11 3:26 2:21:23
Halfway 1:10:37 2:21:14
25 1:23:10 16:09 3:14 2:20:22
30 1:39:11 16:01 3:12 2:19:30
35 1:55:25 16:14 3:15 2:19:19
40 2:12:07 16:42 3:20 2:19:22
Finish 2:19:19
 
In-race commentary time line

Women start

The women are running 5:15 to 5:20 per mile early on, which is a reasonable start - projects just under 2:20.  But, they're just through 4km now, so a long way to go.  The elite group is maybe 10 to 12 large.  The commentator keeps saying that Keitany is running her first marathon - she's not.  She came 3rd in New York last year.  She's showing very aggressively at the front so far, but everyone is in touch.

5km in 16:16.  2:17 projected, so that's quick, but the start of London is slightly down (from 3km to 4km - the mile there was 5:05) so it's always reasonably quick.  Expect it to slow down between 5km and 10km.

10km in 32:54, so it has slowed a little - 16:38 for the last 5km, including a slow mile of 5:48.  Mikitenko dropped off just around 5km, but other than that, all the major contenders are there.  Keitany running off to the side, Shobukova paying close attention to the pace-maker (and there is only one, which is strange)

Last mile in 5:02, so that must presumably be a downhill mile following the slight uphill.  Either that or the pace is fast-slow, but that's less likely.

Men start

The men are about to start.  What an incredible field.  Makau vs Kebede is probably the big battle, Makau being the World # 1 last year, and Kebede being beaten only by Wanjiru in that epic Chicago race.  But there are maybe 6 men with a good chance of winning.  Martin Lel is the dangerous unknown - the most incredible racer in the marathon a few years ago, he's returning from injuries that have forced withdrawals from his last few races, so I don't expect, but hope for something from him.

At 15km, the women are on course for 2:20:11, so it is slowing.  It's gone 3:15/km to 3:20/km to 3:23/km. The pacemaker has been joined by Shobukhova, who is probably more responsible for the pace than the official pacemaker.  Very confident way to run.  Keitany and Kiplagat, the big Kenyan challengers are in the pack now.

Men at 5km in 14:34.  Very fast, projecting a 2:02, but don't get too excited - as we said for the women, the 4th kilometer is downhill so the first 5km are very quick.  But it's a good sign of aggressive running so far.  17 men in the lead group, excluding 5 pacemakers.

The front men's group has now split, and of the five pacemakers, there are now only two in the front group.  There was a plan for a second paced group to run for around 2:06 - 2:07 (compared to a 62 min through halfway for the first group), so they have now separated into the "hierarchies".  There are nine in the group at the front, excluding those two pacemakers.

Women at 20km, and the progressive decline in speed has continued - the last 5km were at 3:26/km, so it's gotten slower by around 3sec/km since the start.  The projection is now for 2:21:23, and given her finishing speed, this will suit Shobukhova nicely.  Keitany may also enjoy the slower pace, given her half marathon credentials.

Shobukhova drives very hard through the halfway mark, which is reached in 1:10:37.  That move didn't achieve too much, maybe she was just testing the Kenyans behind her.  Very aggressive, that's a long way out to be driving at the front.  She obviously feels good.  Given how quick her finish is, it's a bit surprising to see that early push.  The pacemaker is gone, so now it's a race.

Men at 10km, and it has slowed just a little, but that was expected.  The last 5km were in 14:49, and the overall projected time is now 2:03:59, which happens to be the World Record.  The 14:49 is a touch slower though, if they were to maintain that, they'll do just inside 2:05.  The next 10km will tell us...

Mary Keitany has come to the front of the women's race now, and she's the big danger.  Shobukhova's move has been the catalyst for an overall increase in the aggression of the race.  The lead group is now seven, Keitany at the front and Shobukhova following her.  Remember that Shobukhova ran the final 2.2km of Chicago faster than the men's winner did, so she has serious speed at the end of the marathon.  A race between her and the half-marathon record holder is a great prospect!

Keitany is actually about 4 m clear.  She's driving very hard.  Shobukhova is gradually pulling the group back towards Keitany.  It's all happening very early in the women's race.  The 20-25km split will be very interesting.  This pace is doing some serious damage to the group behind her, they're in a long line and gaps are appearing everywhere!  She's surged again and opened a lead on Shobukhova.

Keitany has about 30 m on the chasers now.  And Shobukhova is no longer doing the leading in the chase group.  This is a serious move, it's opened the race up completely!  This is the kind of racing not seenin women's marathon running.

At 25km, Keitany is six seconds clear.  Her last 5km was in 16:09, the fastest of the race and that's what has done the damage.  The group behind are split and this is the race's big move.  Kiplagat is chasing, followed by Kebede, Bekele and Shobukhova, who started the racing at halfway and now being severely tested!

The men are at 15km in 44:26, having covered the last 5km in 15:03.  That will disappoint the race organizers, having asked for a 62 at halfway.  The pace is considerably slower than that now, and so any thoughts of the world record are fading fast.

Around 28km, and Shobukhova has moved into second, but Keitany has a gap of maybe 30 seconds.  She's out of sight as they go through a twisty section and Keitany is looking superb, so fluid.  The only danger for Keitany now is the distance and whether she'll pay for this surge.  The pace hasn't slowed behind, and so Keitany is still holding a pace of around 3:15/km, which is incredible running.  Last year's winning time was 2:21:59 by Shobukhova, this should be substantially faster.

Keitany has reached 30 km in 1:39:11, with a last 5km of 16:01, so she's actually gotten even faster!  It's extra-ordinary front running.  And while it's not entirely unchartered territory, to move this far out in only your second major marathon is exceptional running.  The projected time has now dropped to 2:19:30, and the way Keitany is running, even 2:18 is not out of the question.  The gap to the chasing Shobukhova & co is 33 seconds, and so they're running 16:25 for the last 5km, which is good pace, but Keitany is soaring at the front!

The men at 20km, and the pace is still pretty slow.  15:03 for the last 5km, and so that's 30:06 from 10km to 20km.  And that's not what the agreed pace was.  The halfway split is 62:44, and the commentators are projecting 2:05:30.  That's a bit misleading, because the first 5km was so quick.

The truth is that given the last 10km, unless the pace picks up, they'll run around 2:06:20.  Interesting to see how the racing in the second half affects this.  Expect it to get quicker, but the sub 2:05 is looking out of reach for now.  It'll take serious racing to bring them under that barrier.

All the main protagonists are there.  Mo Trafeh has dropped off, 14 seconds down at halfway, but he was running above himself to be there, and now will try to settle one something around 2:07 pace.  The lead group is 10 men, Makau, Kebede, Lel, Kwambai and Gharib are all still in that group.

Keitany has hit 35km, and the pace is still strong, though understandably has slowed somewhat.  The last 5km were covered in 16:14.  The lead has grown - Shobukhova and Kiplagat are now 1:09 behind, so she's opened up another 36 seconds in the last 5km!  She's unlikely to be coming back and marathon running has a new star!

The men have increased the pace, and at 25km, they're speeding up again.  The last 5km were in 14:47, which is 2:57/km pace and brings the projected time down.  The group is still 10 deep, one pacemaker there.  Kebede and Makau paying closer attention now.

Keitany through 40km in 2:12:07, so she has slowed - the last 5km has been covered at 3:20/km.  The gap to Shobukhova, who is now clear in second, is 1:07, so that hasn't changed since the 35km mark (it was 1:09 then.  She'll break 2:20 as well, comfortably - right now it's projected at 2:19:22, so expect 2:19:30-something.

The men are at 30km  - 1:29:20, and it's just outside 15 for the last 5km.  So again, slower than we all thought it would be.  Martin Lel is still there, and looking so smooth.  If his training was not quite geared towards London, it'll start to tell soon.  But if he's there at 40km, then his finishing ability (assuming three years haven't eroded it) will be hard to match.

The race has now begun though, the pacemaker is gone and the big guns are to the front.  The elite group is down to six men - Mutai, Kebede, Lel, Makau, dos Santos.

Keitany wins!  2:19:19!  Women's marathon running has a new superstar!  Whenever a super quick half-marathon athlete steps up, you expect great things, and Keitany is a fearsome half marathon athlete, so she is delivering on her promise now!  She'll be a big favourite in London next year, and the rest of the world will have taken notice!

Shobukhova coming in second with a super quick finish, she'll run a PB in 2:20:15 and a great run, but put into the shade by an amazing performance from Mary Keitany.

And now we get to see the rest of the women finish while the men's race is being decided.  This happens every year.  Let's see who finishes 18th in the women's race, forget the men's winners...

The men's race is on!  Mutai is pushing the pace and it's Martin Lel following!  Lel is there, and challenging.  Kebede is in third, Makau in fourth, but gapped from the front three just slightly, and we're coming up to 35 km.

No wait, we're going to see the women again.  We'll wait for Jo Pavey, I'm sure.  I appreciate the local interest, of course, but this is a lot like having a car dealership and putting the Ferraris and Porsches in the back, with the Toyotas and Volkswagens out front.  This is a global event, they need to cater to it - you can't grow the sport by "hiding" the superstars.  Very ordinary.

Ok, she's done now for the love of marathon running, can we PLEASE see the men's race!  No?  Ok, let's stick with the 20th best women for a little longer, and NOT watch the men...  London, you have truly outdone yourself this year.

Oh, there is a men's race after all.  They're at 35km, and Emmanuel Mutai is clear.  He covered the last 5km in 14:26, an exceptional surge in pace.  That was enough to drop Lel, who was "last man standing", and Mutai is 20 seconds clear!  That gap was created very quickly - at 32 km, they were together, and so Lel may have hit something of a wall.

This is the race's decisive move, with mile splits of 4:30 and 4:31 (2:47 per kilometer for 3km).  Lel is second, 20 seconds down at 35km, and Makau a second back of him.  The pre-race favourite, Tsegay Kebede, who spoke a good game of a world record before the race, has been pushed right back.  At 35km, he's 36 seconds down in 5th place.  In fourth is Dos Santos of Brazil, but we'll get a much clearer picture at 40km in a few minutes' time.

From the camera shots, no one will catch Mutai, he has clear road behind and ahead, and he'll win this race with about 12 minutes to go.  Meanwhile, we'll switch back to the women, and watch the women finishing in 2:38 or slower.  And we'll stay with these pictures, to see a 2:41 marathon runner, while the elite men running 2:05 are ignored.  Go London coverage!  It's not difficult to split the feeds, the international feed can easily be separated from what is shown locally.

Mutai at 40km, and the time is 1:58:05, and Mutai is flying!  He's going to break the course record, and run one of the fastest marathons in history!  And that's off the back of a relatively conservative period from 5km to 30km - 62:44 at halfway, and the section 5km to 30km was run at 2:06:11 pace.  So Mutai is going to go under 62 minutes for the second half!

Exceptional running!  Martin Lel has hung in there and is second, 53 seconds down, with Makau just behind him in third.  Makau will probably catch him.  That means that Lel and Makau have maintained the pace and are on course for around 2:05:30, which is exactly what the halfway split predicted. So Mutai has been the man to emerge from the pack today with an outrageously fast second half.  His last 5km were covered in 14:19, following on from a 14:26, and that's 2:52/km.

Mutai has won in 2:04:40, making him the fourth fastest man in history, behind Gebrselassie, Kibet and Kwambai (Geb has run faster twice, incidentally).  It's a course record, and it's been achieved with a second half of 61:56, which is super quick.  The final 12km, incidentally, from 30km, were covered in 35:20, which is 2:54 pace, or a 2:02 marathon!

Martin Lel has won a sprint for second in 2:05:45, and that is an exceptional comeback from the multiple London champion.  Makau is third only a second behind, and dos Santos has finished fourth.  Tsegay Kebede, meanwhile, has finished fifth in 2:07:47.  That's pretty disappointing for him, given the pre-race talk and his last few performances.  It's made more so by the fact that the halfway split of 62:44 was not that quick, so his second half was 65:03, which he'll be disappointed with.  A bad day at the office.

The pacing - only one faster second half


An interesting note on pacing - the halfway split was reached in 62:44, which predicts at 2:05:28.  And so the only elite athlete in the race to negative split was Mutai.  That's unusual, but what's more amazing is the size of his negative split, compared to the positive split in some of the other elites.


For example, Mutai's difference was 62:44 - 61:56, a 48 second differential faster!  Lel and Makau ran the second half in 62:51, so 7 seconds slower.  dos Santos was 63:50 or 66 seconds slower, and Kebede ran his second half 2:19 slower (65:03 vs 62:44).  

So a race of attrition for all but the top 3, and especially for Mutai, who aided by his final 12km in 2:54/km was absolutely exceptional.  The large spread across the top 8 was the result of Mutai's amazing surge, combined with a big drop-off in pace by almost everyone else.  One would not have thought that the men finishing in 5th or lower would run 65 minutes for the second half...



Ross

Minggu, 13 April 2008

London Marathon 2008 Results & Report

Martin Lel: The greatest marathon runner in the world - London Marathon Champion 2008

The London Marathon, every year the deepest and most competitive marathon in the world, lived up to the hype today, and it was Martin Lel who defended his title and confirmed his status as the greatest racer in the world - he won in a time of 2:05:21, winning the highest quality marathon in history. Three men broke 2:06, three more broke 2:07, but it was Lel who retained his crown as the greatest runner in the world with another royal performance.

The table below shows how Lel put his race together, depicting the splits and paces at various distance intervals. It is followed by a graph showing the pace per 5km interval, along with some highlights indicated on the graph.



How the race unfolded - superhuman early pace, too fast too soon

The early pace was incredibly fast. Last week's Paris Marathon saw about 20 men together until halfway. This race broke up almost from the start. And given that the field was so deep and full of quality, to see a group of only 12 men well clear of the field after only 3km was a surprise - that group, which included Lel, Limo, Goumri, Wanjiru and Hall (all our favourites from yesterday's preview), was clearly moving quickly.

The first split of note was at 5km - 14:21, which is absolutely incredible. It works out to 2:52min/km, which projects a time of 2:01 for the marathon, and also explains why such a large split would occur in such a quality race.

The 10km mark was reached in 29:10 - still a projected world record time of 2:03:04, though the pace had dropped somewhat between 5km and 10km - "only" 2:58 for this interval. All the big names were there - Kibet and Baldini were absent, but realistically, they were never going to feature in a sub-2:06 race, never mind a sub-2:03! (Incidentally, Kibet was 30 seconds down at 10km, perhaps a more sensible strategy)

Pacemakers gone but the relentless pace continues

Often, the problem with the super-human early pace (apart from the fact that I don't believe it's physiologically possible at this stage for anyone to run under 2:03), is that the pace setters are likely to drop out sooner than they might on a reasonable (2:05-something) pace. And in a race with 11 superstars, that would cause a drop-off in the second half pace, as everyone starts watching everyone else, biding their time, and recovering from the early explosion.

That didn't happen in London, at least at first! It's difficult to say when the pacemakers did drop out, but it was sometime between 22 and 27km (we got to watch the mediocre British women running 2:30 during this time). At about 30km, the race split, and a select group of five went off the front. Lel, Wanjiru and Mutai of Kenya were accompanied by Goumri of Morocco and Deriba Merga of Ethiopia. Ryan Hall, the great USA hope, had been dropped off, perhaps a victim of the early pace, along with Felix Limo of Kenya

That split was caused by a subtle increase in pace - 2:56/km between 25 and 30km. Absolutely incredible that the pace could increase at all, but once the pacemakers dropped off, the big five moved clear and then it was race on.

I then did not see any of the elite men's race for about 10 minutes, as once again, the world feed focused on either the women's minor placings, or the footage of Dan Robinson catching up to Stefano Baldini. Not to take anything away from Dan Robinson, but when a 2:05 race is going on in the front, watching the 2:12 finishers at the 35 km mark was a somewhat frustrating experience!

In any event, some drama was being missed, because when we finally cut back to the race at the 35km point, Mutai of Kenya had dropped off, and Ryan Hall was beginning to catch up. That was caused by quite a dramatic slowing in the pace - the 5km interval from 30 to 35 km was covered in 15:25 - only 3:05/km. That allowed Hall a look in, but then Lel pressed on and the pace increased again.

The final 2km - Lel's territory and a spectacular finish

At 40km, the lead group was down to 3, Merga having been dropped off. Lel was looking majestic, Wanjiru looked strong, and Goumri, tucked in in third place, didn't look overly distressed. What must have been going through Goumri's mind at this stage - he'd run two marathons, and twice been in this exact situation, and twice had been destroyed by Lel's finishing kick. In the end, it didn't matter, because with 1km to go, Goumri was gapped - not by much, but 5m at this stage is telling.

And so it was down to two. I am a huge fan of Lel's, I think he is the royalty of world distance running. And with 1km to go, he looked every bit the king of the road. He glanced at his watch, looked over his shoulder, and looked more like a world class runner who was passing a weekend jogger. And with 400 yards to go, they swept right onto the final straight, and Lel moved clear, with almost no effort. Wanjiru was pulled apart in the final 300m, and Lel was glancing at his watch for the time....That's how easy it was - Martin Lel, the greatest marathon runner in the world, destroyed the best field ever assembled and did it looking comfortable. Absolutely majestic - in a paced time-trial, the kind that Gebrselassie likes to run, Lel would break the world record, I have no doubt.

The women's race: Irina Mikitenko claims her first London title

In the absence of Paula Radcliffe, the Japenese and the Chinese, including last year's champion, Chou Zhonxiu, the women's race was always going to be wide open. Before the race, the two big favourites were the two Ethiopians, Gete Wami and Berhane Adere.

In the end, it was Mikitenko who took it out, winning what was a somewhat weaker women's race, thanks to the absence of those big names.

How it unfolded

The women's race was without pacemakers, which had major implications for the race strategy. With perhaps five or six big favourites who were content to sit in the group for the first part of the race, the early pace was relatively sedate. All the big names had recently put in good performances over the shorter distances, and so the indications were there that they might wait out the first half and then push on in the second.

And so it turned out, the early pace relatively slow. After about 5km, Constantina Dita of Romania, one of the more experienced runners in the field took up the pace. At 10km, the runners were on course for a 2:27 - very slow by big marathon standards. However, it was getting faster and faster, and a time that slow was never going to happen once the real racing began.

From 10km to 15km, the pace was really ramped up, a series of 3:20 kilometers bringing a split in the lead group, which broke up into 10 runners. At 15km, the projected time was 2:25:48, testimony to how much the speed had increased.

Soon after halfway, the pace increased as Irina Mikitenko pressed on, and the group was cut to seven women - Adere and Wami were there, though in Wami's case, her reaction to the move was a little sluggish. The pace was still 2:25, which is not remarkable, but it was up and down, according to the mile splits provided.

Disaster struck for Gete Wami at about the 30km mark, when she fell at a drinks station. She lost about 60m, but valiantly closed the gap. She then settled on the shoulder of Mikitenko, and soon became part of a break of three athletes. Adere was dropped, surprisingly, with about 5 km to run, and the gaps opened rapidly under the pressure of Mikitenko's surge.

At this stage, it was still Wami's race, though she kept holding her hip, perhaps affected by the fall. And then with a few kilometers to run, it was Mikitenko who emerged from a tunnel with a gap of 20m over Zakharova. Wami was in third, even further behind, and her bid for the London title was disapparing fast. The pace from 35km to the finish averaged 3:18, which is how the gaps were created. It was surprising that gaps were created and that Wami and Adere, in particular, were dropped off this pace, but Wami will cite her fall as the reason.

In the end, it was Mikitenko who took that title in a time of 2:24:14, in what must be described as a mediocre race. The times were mediocre, the racing not especially tight, and were it not for Wami's fall, a race lacking excitement on the whole.

For the rest, there was not much that Paula Radcliffe will be concerned about - her attention will be on the Japanese and Chinese runners who were not in London, along with the Kenyans.

Summary

So another fantastic men's race in London, Martin Lel confirming his status as the greatest racer in the world. A real shame that Gebrselassie was not there, but I suspect he'd have had his work cut out to match this performance. Lel is now lined up for Beijing, where he'll be the big favourite, and few would bet against him, barring the heat and its effects. I'd love to see Lel race in a non-competitive, paced marathon, where he has the support of pacemakers and no competition, to try to break that world record. He certainly has the credentials.

Join us again tomorrow for more analysis and insight into the race

Ross

Sabtu, 12 April 2008

London Marathon Preview

Our crystal ball: London Marathon preview: Majestic Martin to make it three out of three

Tomorrow sees the year's biggest marathon in London - well, OK, I'll concede that the Olympic Marathon later this year in Beijing may have more significance this year, but London brings together what is arguably a stronger field - no limits of three athletes per country, for example.

About a week ago, we took a look at the men's field, and it seems that every year, London's organizers outdo themselves by bringing together the very best in the world. Since about 2002, London has brought together the top 10 marathon runners, with only a few exceptions - this year, it's a big name, Haile Gebrselassie, who opted to run in Dubai earlier this year, and will probably race Berlin later this year (which may well be the real reason he's opted out of Beijing, but that's another story altogether!).

But the rest are all there - Martin Lel, the greatest marathoner in the world at the moment in a competitive race, a majestic runner who I believe will win the race on Sunday, despite the problems he's faced in recent months back in Kenya. In fact, the Kenyan violence got so bad that he had to leave his normal training base and travel to Namibia in order to train. Just how this will affect him on Sunday is anyone's guess - my personal take is that Lel has, over the last 3 years, proved beyond a shadow of a doubt that he is the best in the world at getting it right on the day.

This of course, is what sets Lel apart - physiologically, the margins for error in the marathon are so small, and so much can go wrong on the day - any number of factors can derail even the best training. But Lel has put together a string of performances over the last 3 years that no other runner in the world can match.

He won London in 2005, was 2nd in 2006, won it in 2007, and went on to win New York last year as well. His explosive finishing speed - 63 seconds for the final 400m in New York - is unmatched in the field, and he also has the ability to run fast - a 2:06:41 PB, but more significant, a string of 60min half marathons, including last year's Great North Run, where he comfortably dismissed Sammy Wanjiru, who is a 58-something 21km runner!

So Lel has every weapon he needs, on the day, to win this race and make it three big wins in a row - London, New York and London again. Gebrselassie is the best time-trialler in the world, but in a race, I'd back Lel every time. The only lingering doubt is his fitness thanks to the violence in Kenya, and of course, there's the small matter of the rest of the field....!

The competition - names to look out for

Lel certainly will not defend his crown without an effort. Also in the field are (in order of my picks for the race):

Sammy Wanjiru of Kenya, Abderrahim Goumri of Morocco, Felix Limo of Kenya, and Ryan Hall of the USA. And that's not even mentioning any of the "dark horses" in the event, including Luke Kibet (world champion, but only 11th fastest in the field with 2:08:52 - that's how good the field is)and Emmanuel Mutai (2:06:29 marathon last year, 2nd only to Gebrselassie on the rankings).

I believe that Sammy Wanjiru has the best shot at challenging Lel - his 21km credentials stand out, even in this field, and given that the race is likely to be fast, though not WR pace I don't think, he'll be a factor. He also has a 2:06 debut last year in Fukuoka, and will certainly go on to win a Major race in the next 2 years. Whether it will be Sunday, who knows?

Goumri of Morocco must be sick of the sight of the back of Martin Lel. He's run two marathons, and Lel has beaten him twice, first in London, then in New York. In New York, Lel was so spectacular that he put a nine second gap onto Goumri in about 300m, and so Goumri may be the man who has to force the pace from 38km, because he's twice been burned by Lel, and will also be concerned about Limo and particularly Wanjiru. Goumri will therefore be a major player in race strategy - he'll take it up with 5km to go, and he will feature for a podium, but won't quite win it. He'll have to wait another race for that to come around.

Felix Limo of Kenya has a CV that no other runner can quite match, with the exception of Lel. He won Berlin in 2004, then went on to win Chicago and London in 2005, so like Lel, has shown the ability to get it right on the day. He also came third in London last year, and I believe he'll feature in the top 5. What counts against him is the violence in Kenya, which disrupted his preparations as well, and then the fact that he might not quite have the sharpness in the final 5 km, where this race will be won and lost.

Ryan Hall of the USA is an interesting one - the great hope of the "non-African" world, he's on the up - a 2:08 debut in London last year to finish 7th was followed by a mighty impressive win in the US Trials in New York. That day, he ran the second half in 1:03, to finish in 2:09, so he has the ability to sustain high pace on the second half. His coach believes he could win (obviously), and he's certainly going to feature, but I don't think he will quite have the quality in the final 5km to match the racing that is likely to be going on. Expect a top 5, but not a podium. His biggest contribution will be that he takes the pace up from 32km, when the pace-setters drop out. All the tactically-savvy, thoroughbred-racing Kenyans will be watching each other, and Hall and the Moroccans will press on.

How the race will unfold - a bit of fun with the predictions of tactics

Will we see a world record on Sunday? Don't bet on it. The paradox is that as you increase the strength of the field, the chance of a record actually falls. Too many great runners, (and great racers), and a situation will develop where they are all watching one another. Why make a move at 35 km to keep the pace at 2:57/km when all you'll do is pull any one of the seven men behind you to the finish line, where they'll outkick you? That's the logic, and it will mean that the time is more likely to be in the mid-2:05 range. Still incredibly fast, but not world record pace.

We've already seen that the weather should not pose too much of a problem, apart from a chance of some wind. But I think it's safe to say that the first half will be run in 62:40. That's close to what the pace-setters are reportedly being asked to run - 62:30. And in a marathon, it's unlikely they won't hit that pretty accurately - too much opportunity for feedback to regulate it, so don't expect a halfway split too far off that.

Now, once they go through halfway, then the racing still won't begin, until the pace-setters drop out. We've seen in Berlin and also in Paris that the pace-makers made it to 30km, and I expect the same on Sunday. So it's at 30km that the real "race" begins. I'd guess we're looking at a time of about 89:30 at 30km - the pace will slow from 21 km to 30km, because no one will want to push the pacemakers faster, and none of the super-elite will move this early. So this 9km stretch will see a drop in pace, as a big group of perhaps 10 to 15 athletes bunch together, waiting for the racing to start.

The real race - from 30km onwards

That will happen at 30km, but the pace will remain relatively slow - just outside 3min/km, and this period will see the predicted finishing time fall from 2:05:20 (at halfway) to about 2:06.

Then, at 35km, someone with itchy legs will make a move. My guess is that it will be Ryan Hall, because guys like Lel, Limo and Wanjiru have no reason to want to press on - they are thoroughbred racers and have more than enough reason to believe in their finishing ability. So Hall to take the pace from 35km, for about 3km, where the pace may drop below 3min/km again. But then at 38km, I predict Goumri to take it up, and really push hard - expect a 2:51 kilometer at this point.

Goumri, who has a 5km PB of 12:50, has run two marathons and been outsprinted twice - it's the only memory he has of the marathon! So he'll go early, in an attempt to shake off the Lels and Wanjirus. It won't work. He'll succeed in splitting a group of about 8, and it will drop to perhaps 4 (Felix Limo is the other one). However, in the final 2 km, the race will settle again, as everyone realizes we're going to be on for a race down Birdcage walk - see the video of last year's race below, for a taster of what to expect on Sunday!

And then, with 400m to go, Lel hits the front, 63 second 400m credentials come through, and he wins. While I'm having fun predicting the future, I'll call the winning time - 2:05:43. The last 7km have been covered in a shade over 20 minutes (2:52/km), and Martin Lel wins the London Marathon again, confirming that he's the best racer in the world!

Conclusion - the unpredictablity of the marathon

That's my guess for what will happen, but who knows? The beauty of sport is that it invites speculation, and my "educated" (can one ever be this when predicting the marathon?) says this is how the race will unfold - Hall, Goumri and Lel will create the strategy out of necessity and the fact that they'll play to their strengths.

Of course, I might, and probably will be, completely wrong! If so, I'll humbly eat my words and invoke the escape clause - "The marathon is unpredictable!" The big mystery remains the Kenyans and their preparation given the sad violence in their country. Time will tell!

Until then, enjoy the video below, which shows highlights of last year's spectacular finish. Let's hope that we at least get the same! I suspect we will...

And then do join us for the post-race analysis - the split times will go up almost instantly after the finish on Sunday, and more detailed discussion to follow - the why? and how? to the What happened?

Ross

P.S. If you can't watch the race on TV, for whatever reason, check out WCSN for a feed! They do a great job of covering this (and other) sports events.

Selasa, 08 April 2008

London Marathon 2008 Weather forecast

Ambient temperatures might be optimal

Well in spite of cool temperatures in most climes, it is going to be a hot week here at The Science of Sport. The swimsuit debate continues to heat up, the Olympic torch relay is being protested with a vengeance in every city so far, and let's not forget that the 2008 Flora London Marathon is this Sunday, 13 April. As we mentioned at the end of last week, organizer Dave Bedford as once again assembled a legendary field. We will analyze both the men's and women's fields later in the week, though, and today we will focus on the weather.

Most of us who run or are running fans have, at one time or another, heard that records are set in cloudy and cool conditions. This anecdotal evidence is then supported by our own experiences of running in similar conditions. How many of us get that feeling on crisp autumn days that we can run forever? Conversely, how many of us get the feeling in the middle of summer that all we can manage that day is a measly five km because the heat seems to oppressive?

To many it would seem, then, that there is an optimal range of environmental conditions that will be conducive to great performances, be them world records or personal bests for weekend warriors. The forecast for London on Sunday is for partly cloudy skies with a temperature around 10 C and humidity around 80%. What will this mean for the performances?

Science answers

Fortunately for us a group of scientists from the U.S. Army's Research Institute for Environmental Medicine took the time to analyze this concept. The result was two papers (here and here) published last year in Medicine and Science in Sports and Exercise. The primary thrust of the research was to investigate how the weather impacts race time, and if this idea that fast (and record) times are produced only in cloudy and cool conditions.

In the first paper, "Impact of weather on Marathon-running Performance," the scientists examined seven North American marathons. They divided them into different temperature categories and then they analyzed the top three finishing times to see how far off they were from the course record. They also examined the 25th, 50th, 100th, and 300th finishing times and compared them to the course record. Effectively they wanted to see just how much the weather was slowing down the runners, both fast and slower (middle-of-the-pack) alike.

Not surprisingly, the times were closer to the course records when the temperatures were milder. Specifically, when the ambient temperature was between 5-13 C and the humidity was 17-100% the top three times in the race were within 1.7% of the course record. Given London's course record of 2:05:38, 1.7% translates into about a two minute decrement, or around 2:07, which is where the winning time has been since Khannouchi set the world record there in 2002.

Clouds or no clouds, they run fast

The second paper, "Neither cloud cover nor low solar loads are associated with fast marathon performance," took a more detailed look at the specific weather conditions and tried to determine if record times are really run in those "I-could-have-run-forever" conditions. The results of this one might surprise you!

From the figure below (click to see a larger image), we see a frequency distribution on the y-axis and the ambient temperature in Celsius on the x-axis. Each column is divided into sections the represent (from bottom to top) cloudy, partly cloudy, scattered clouds, and clear conditions. The graph on the left represents all of their data, while the graph on the right represents just the course records.


The first thing you notice should be that their is a normal distribution across the range of temperatures, and nearly 80% of the course records were run in the milder conditions of 5-15 C. However you must also see that the course records were run in a wide range of conditions, with cloudy and clear and everything in between represented in apparently equal proportions. The conclusion here is that we are likely to see a fast time regardless of the cloud cover, and that the ambient temperature is a better predictor of the winning time.

Looking ahead to Sunday's race

As we stated above, the forecast for race day is partly cloudy skies, around 10 C, and about 80% humidity. These fall right in the middle of the "optimal" conditions for a fast time, and not coincidentally are common conditions for London in April. Therefore it is no wonder that the average winning time for the last 10 years is 2:07:08 and that Khannouchi set the world record there back in 2002! Interestingly, however, Sunday might be a few degrees warmer than the average temperatures of 7.8 C (men) and 14.3 C (women) during previous world record performances.

Later this week we will have a full preview of both the men's and women's races, so please come back and join us for those!


References

ELY M, CHEUVRONT S, and MONTAIN S. Neither Cloud Cover nor Low Solar Loads Are Associated with Fast Marathon Performance. Medicine and Science in Sports and Exercise. Vol 39, Issue 11. November 2007.

ELY M, CHEUVRONT S, ROBERTS W, and MONTAIN S. Impact of Weather on Marathon- Running Performance. Medicine and Science in Sports and Exercise. Vol 39, Issue 3. March 2007.