Bit of a disappointment

Lactate test knock

17 messages
02/02/2013 at 19:39
I'm a bit dejected tonight people. I took advantage of a freebie blood lactate sample today with a view to aiding my London marathon training. Well the long and the short of it was that I was old that if I try to run a sub 4h marathon they'll have to shovel me off the road! Came as a bit of a shock really. I know that I'm not ready now, but London is 12 weeks away. I'm getting my miles in five days a week, do a 10k in 46min and a half in 1h45. Is a sub 4h really that over ambitious? I'm a great believer in science, but I honestly think that I'm capable.
02/02/2013 at 19:46

What's blood lactate levels got to do with running a marathon?

800m track race perhaps.

The marathon is 99% plus aerobic.

Nearest most runners get to raising blood lactate levels in a marathon is when they start chatting on their phones or eating their lunch.

02/02/2013 at 19:49
Looking at your times you don't look far off. Keep the training up and work on the endurance and you should be ok on the day.
02/02/2013 at 19:53

Your freebie blood lactate test probably says you're not capable of a 46 minute 10k...

02/02/2013 at 19:54
The good news is that you have 7 or 8 weeks to really work on shifting the LT to the right. Were you given a LT pace or heart rate?. How has this compared to the threshod runs that you have included in your training - what pace/hr are you running them at. What kind of session are you running to improve your threshold. I'm sure there will be plenty of advice on putting some sessions together.
02/02/2013 at 20:01
For a little bit of homework, pick up a copy of Advanced Marathoning by Pfitzinger & Douglas. Don't be put off the title. They are big on shifting your threshold for marathoning - read up and have a look at the LT sessions in their plans to help shape your sessions
seren nos    pirate
02/02/2013 at 20:01

your 10k and half times are way better than mine and i managed a sub depends of course on how well your training is many long runs you have fitted in and are likely to fit in and how it all goes on the day.........

i agree with Phil...i bet they would say you are not capable of your 10 k time


good luck

02/02/2013 at 20:12

If this is your first marathon then I would suggest you be conservative with your pace ambitions. It is frustrating to finish a marathon feeling you could have gone quicker but this frustration is nothing compared to the pain of running out of steam at 20 miles and hobbling the last few miles. I would base my expectations on my training pace in my long runs. You still have a fair amount of time left to get some miles in. Just completing your training without injuring yourself and running the whole 26 miles is a challenge in itself! Science is great but interpreting it is a pain in the arse!

02/02/2013 at 20:18
Feeling better already people thanks ever so much. It is my first attempt at the distance and I just want everything to go well. Phil- your comment about my 10k time made me smile, Also-ran - second hand copy of book on way from amazon! Seren nos - your thoughts on my times are very encouraging. Everyone else thanks for lifting my spirits and making tomorrows 13 miler seem a little less of a chore!
cougie    pirate
02/02/2013 at 20:44
I don't see any reason why you can't go sub 4. How many 20 milers have you got planned ?
02/02/2013 at 22:37

Your times are certainly compatible with a 4 hour marathon, perhaps the person testing wasn't properly equipped or trained?

I listened to Tony Audenshaw on this week's marathon talk podcast talking about lactate threshold and testing.  Didn't sound like it was the kind of thing you'd get for free. I asked my friend at our club who is a sports science lecturer for one and she said I'd need a morning off work and she would run me till I was sick to get the different levels.  Audenshaw went on to say that his lactate threshold session was the biggest contributor to his improved times, so I think it's well worth working on



02/02/2013 at 22:44

Oh you are more than capable of doing a sub 4.  Your 10k and HM PBs are near identical to mine were when I did a 3:54 in October (2nd marathon) (10k was 46:14 and HM was 1:44:17)  My first marathon was 4:06 but that was Manchester and pretty horrific conditions (my HM PB at that time was 1:45).  

Agree with Also Ran re P&D book, I am currently following their plan and am definitely shifting my training to easier paces than ever before - I made mistake of doing too much steady and threshold running for my last marathons and it is a huge error.  It is an aerobic event so doing lots of aerobic running at an easy pace with a few miles a week ran at lactate threshold in a tempo run will help you hugely.

Edited: 02/02/2013 at 22:46
03/02/2013 at 06:54

You should be fine with sub 4. The blood test - did they take just one sample at rest? Unless they took several samples at increasing levels of effort I don't see how they can detirmine your lactate threshold and pace.

03/02/2013 at 08:15
Just one sample after running at TMP for five minutes or so. Reading was 7. Therefore they said my body would be unable to buffer that for the full distance.
03/02/2013 at 10:43

That's not how lactate testing is done for running if I went and paid for it tomorrow - generally blood samples are taken multiple times over increasingly fast speed intervals.

If you are going to make use of this type of stuff, then it only really makes sense with regular retesting. Thats why I just run threshold sessions at an approx pace of 5 - 10 seconds per mile faster than I think I can currently do a HM in, and ask myself, is this pace comfortably hard - can I keep it up for an hour. 4 to 7 miles at this intensity is the typical P&D threshold session. For a fast distance runner, then the pace is going to be close to half marathon pace.

So in conclusion, if you want to go down the science route, you need a load of pricks to test yout LT. One prick is not enough.

Edited: 03/02/2013 at 10:48
03/02/2013 at 12:30
Think it was probably meant as a tool to drum up trade for their full lactate test. Prick the conscience as well as the finger!
At present I'm doing my LSRs at TMP. Am I overtraining? Currently at 13 miles churning out sub 9 minute miles. Should I be taking these easier?
03/02/2013 at 13:03

If you are doing 13 miles relatively easily I doubt it is really at tempo pace. As you get fitter as long as you are doing intervals/threshold runs your long runs start to be at a lower percentage of you maximum (as your max increases). As long as you can do the long runs at an even pace and are not too tired to do the rest of the training you will be ok but don't get too hung up about LSR pace - it is mainly about time on feet/endurance. You may even revise your target time. For my second my original target was sub 4 and training went well so I revised to 3:45 and did 3:41. (down to 3:15 now )
Probably right about drumming up trade for a full test.


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