The simple answer is “YES IT DOES HURT” and you will hear advice from people to the contrary but they are pretty much wrong.
But it is a bit more complicated than a simple yes/no.
First of all if you are asking that question then you CANNOT BE A SERIOUS ATHLETE who follows high-level training plans and maybe who is also coached. Because you must surely already know the answer and how it applies to your personal physiology.
Many training plans WILL have you doing some very light exercise the day before a 5k race but they do not apply to most of us and are really about detailed fine tuning to make small differences for most casual athletes around vasodilation and plasma volumes. Like much of the advice on the net, that you read, it can often be based on deep sports science but the derived benefit may apply to marginal gains for elite athletes.
So let’s turn the question around. If you run tomorrow then when will you get the NET exercise benefit? Well the answer to that is in about 10 days to 2 weeks time (based on increased fitness LESS increased fatigue). So it follows that running the day before a 5k race will not help make you fitter for the following day. It can’t help. It might NOT HURT TOO MUCH but IT MIGHT HURT (if too quick). It’s not worth the risk.
Taking it to the extreme. If you did a VO2 session the day before a race I reckon you would be many tens of seconds off your 5k PB the next day.
Some would even say that you should be careful with any exercise the day before; for example I would not even do stretching the day before – full adaptation will probably not have taken place in 24 hours.
Temper the information in that previous paragraph, however, with your ‘freshness’. Exercise in the 10 days to 2 weeks prior to your race (taper) is designed to keep you ‘race ready’. So by exercising LESS you WILL PROBABLY BE getting less fit BUT you are benefitting OVERALL because your FATIGUE is falling off MUCH MORE quickly. This is tapering.
Tapering is quite tricky to do perfectly, for most of us it’s just easier to avoid running the day before a 5K RACE (remember this is the5krunner.com NOT themarathonrunner.com and NOT the 100m-sprinter.com)
But then again if you are running a 5k but not bothered about a PB or anything like that then sure DO GO FOR A RUN the day before. But here you are just doing a race as part of training. The 5k you are doing IS NOT A RACE (either against the clock or someone else).
So if you, as a casual parkrunner, are racing tomorrow then DO NOT RUN TODAY. At all. I would even extend that to 2 or 3 OR EVEN 4 days before a ‘proper’ race (after an extended training period where I’m heading for a PB). My example is me today. I just did my 5k. I’m a ‘good’ runner and not an elite runner. I got a PB but it was just a course PB and 20 seconds off what I could have done on a good day on that course and the conditions were perfect today. Today is Saturday and I last ran on Tuesday but had a pretty serious 20 minute bike ride (personal TT) on Wednesday. So I had not properly recovered and it probably made around about 1% difference to my time. You have to DO A LOT OF TRAINING to improve by 1% but to knock 1% off your PB maybe all you have to do is not run for 2-3 days. Think about it. Run smart.
The same applies if you are a youngster. You still need that day off before going for a PB. The older you get the more recovery you need.
As I’ve already alluded to, a ‘proper’ pre-race taper (ie reduced exercise) will last about 2 weeks. But it’s hard to do that if you are doing lots of ‘races’ where you are trying to combine PBs with getting stronger. Also a ‘proper’ taper WILL have you doing SOME exercise leading up to the days before a race and this exercise MAINTAINS your fitness (week stops it falling too much) as your fatigue levels also fall.
If you want to look some more into this then google the terms: ‘adaptation’ and ‘compensation’. Here’s a diagram that probably won’t help at all ! But it does show that there CAN BE a negative effect the day after RELATIVELY HARD training. You will find many similar diagrams on the net.
This one is probably a bit clearer regarding recovery:
There are a few forums that link to this post and dispute what I am saying. Fine!! Keep training hard the day before a race then 🙂 I’m just trying to help ! You could also look at tapering on brianmac.co.uk (if you still don’t believe me, he is referred to by British Cycling…errr they’re quite good right?) or elsewhere on this site. You will also hear advice from people like the very well respected and quoted coach, Hal Higdon, who recommend 4 days rest before a 5K race.
Still think I’m wrong?
Good luck. Run smart.
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