To Improve Fitness, Try Sleep

http://well.blogs.nytimes.com/2009/06/17/for-a-better-workout-try-sleep/

by chegra84 • 16 years ago

16 13 16 years ago

well.blogs.nytimes.com

suckafree2• 16 years ago

If all studies were based on such small sample sizes as this, then we'd all be in a world of hurt. I'm very surprised it got approved for publishing.

sutro• 16 years ago

+1 for your username

corruption• 16 years ago

If all laymen knew that n is irrelevant, it's the effect size that matters, we would be in a world of good.

If the difference between means is large compared to the standard deviation of the population under study, you need less n.

Another fun fact: All groups are different given large enough n.

Edit: I'm not endorsing the study - just pointing out that n should not be the most critical thing you look for when evaluating a study. The study is fine as a simple quasi-experiment, testing the hypothesis by induction. I don't see anyone claiming causal links here. Now a study testing the hypothesis deductively needs to be designed.

suckafree2• 16 years ago

Thank you for body slamming me. But in a nice way. I stand corrected.

chegra843• 16 years ago

I think the school, that conducted the study had some effect on it being published.

I don't suspect any school below a rank of 15 would be taken seriously.

rjett• 16 years ago

While I'm sure more sleep probably does boost fitness (and cognitive) performance, this study is pretty narrow in scope and tracks results of a women's tennis team. About the only semi-useful metric they track is the sprint times, but even that isn't very useful because the researchers didn't have a third phase of the study where the women were asked to decrease their sleep back to stage 1 amounts. Having a third stage would help control for performance increase due to practice time. The other metrics they track are highly variable in a sport such as tennis because players can put speeds and spins on the ball to affect the outcome. To control for this, you'd probably have to track a player's performance in a series of matches against the same opponent in addition to having a stage 3 like I described above. Still, tennis is more skill-based and less fitness-based compared to other sports like running, so I think it would be hard to draw conclusions from a study like this.

chegra843• 16 years ago

Oh, I post it because I wanted to know if anybody had any experiences along these lines.

stewiecat• 16 years ago

I have a lot of experience with this. Did three Ironman tri's (with 12 half-IM's thrown in for training) during my late 20's.

While training for the first Ironman, I changed jobs to one that required a commute and a fixed "out the door" time to beat traffic. After starting this, every Friday was cold-day. I'd get so rundown from a lack of sleep, only 8 hours/night, that I'd get a cold every Friday. After knocking off for 10+ on Friday night it'd be gone Saturday.

Sleep is also prominent in modern training programs. The old school train-till-you-die method of unfocused bulk mileage and little rest is gone. Nowadays endurance athletes have narrowly focused training workouts (speed work, intervals, weights, long & easy, etc) with a balance of days off and entire weeks of reduced training volume for recovery where the emphasis is put on rest so the body can rebuild and prepare for the next training cycle.

chegra843• 16 years ago

You have any link to the theory behind the new trend?

julius_geezer• 16 years ago

I don't see how athletes in what rjett calls fitness-based sports can scan sleep without impairing their health. I recall studies from years ago that showed athletes requiring more sleep than the general population.

Evgeny• 16 years ago

I wish I could just "extend my sleep to 10 hours a night". However tired I am, I don't seem to be able to sleep more than 7, sometimes 8 hours tops - I just wake up naturally even if there are no sounds, distractions etc. I don't have problems with having a 1.5-2 hrs nap during the day, but even if I have no naps and am very tired by evening, and go to sleep when I feel like going to sleep - I'll be awake in 7-8 hours and won't be able to sleep more.

My wife, on the other hand, is quite happy to sleep up to 11 hours whenever she gets a chance ...

jongraehl2• 16 years ago

Their rate of improvement over a 5-6 week period increased, but the article omits their baseline rate of improvement (presumably they're still-developing athletes). I didn't check if the actual study addresses this, and in any case, the improvements sound larger than usual.

Of course, it's also nearly impossible to create a placebo 10-hours-sleep intervention :)

To Improve Fitness, Try Sleep

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