Prime Time Light Exposures Do Not Seem to Improve Maximal Physical Performance in Male Elite Athletes, but Enhance End-Spurt Performance

Frontiers in Physiology
Raphael KnaierArno Schmidt-Trucksäss

Abstract

Many sports competitions take place during television prime time, a time of the day when many athletes have already exceeded their time of peak performance. We assessed the effect of different light exposure modalities on physical performance and melatonin levels in athletes during prime time. Seventy-two young, male elite athletes with a median (interquartile range) age of 23 (21; 29) years and maximum oxygen uptake (VO2max) of 63 (58; 66) ml/kg/min were randomly assigned to three different light exposure groups: bright light (BRIGHT), blue monochromatic light (BLUE), and control light (CONTROL). Each light exposure lasted 60 min and was scheduled to start 17 h after each individual's midpoint of sleep (median time: 9:17 pm). Immediately after light exposure, a 12-min time trial was performed on a bicycle ergometer. The test supervisor and participants were blinded to the light condition each participant was exposed to. The median received light intensities and peak wavelengths (photopic lx/nm) measured at eye level were 1319/545 in BRIGHT, 203/469 in BLUE, and 115/545 in CONTROL. In a multivariate analysis adjusted for individual VO2max, total work performed in 12 min did not significantly differ between the three groups. The...Continue Reading

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Citations

Jun 10, 2017·European Journal of Applied Physiology·Raphael KnaierArno Schmidt-Trucksäss
Sep 22, 2018·Medicine and Science in Sports and Exercise·Houda DaaloulDamien Davenne
Apr 25, 2018·Journal of Physiological Anthropology·Wolfgang SchobersbergerVeronika Leichtfried
Dec 15, 2018·Medicine and Science in Sports and Exercise·Raphael KnaierArno Schmidt-TRUCKSäSS
Aug 26, 2021·Medicine and Science in Sports and Exercise·Raphael KnaierFrank A J L Scheer
Oct 7, 2020·Physiology & Behavior·Hui XiaoXuefeng Li

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Clinical Trials Mentioned

NCT02203539

Software Mentioned

ActiGraph
BLUE
SPSS Statistics
R

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