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King Grub
2017-05-04, 10:54
The goal of this project was to examine the influence of a single night of sleep restriction following heavy exercise on cycling time trial performance (TT) and skeletal muscle function in the morning. Seven recreational cyclists (age, 24 ± 7 yrs; VO2peak, 62 ± 4 ml・kg-1・min-1) completed two phases, each consisting of evening (EX1) and next-morning (EX2) exercise sessions. EX1 and EX2 were separated by an assigned sleep condition; a full night of rest (CON, 7.1 ± 0.3 hrs of sleep) or sleep restriction through early waking (SR, 2.4 ± 0.2 hrs). EX 1 consisted of baseline testing (muscle soreness, isokinetic torque, and 3-km TT performance) followed by heavy exercise that included 60 min of high intensity cycling intervals and resistance exercise. EX2 was performed to assess recovery from EX1 and included all baseline measures. Magnitude-based inferences were used to evaluate all variables. SR had a negative effect (very likely) on the change in 3-km TT performance compared to CON. Specifically, 3-km TT performance was 'very likely' slower during EX2 compared to EX1 following SR (-4.0 ± 3.0%), whereas 3-km TT performance was 'possibly' slower during EX2 (vs. EX1) following CON (-0.5 ± 3.0%). Sleep condition did not influence changes in peak torque or muscle soreness from EX1 to EX2. A single night of sleep restriction following heavy exercise had marked consequences on 3-km TT performance the next morning. Because occasional sleep loss is likely, strategies to ameliorate the consequences of sleep loss on performance should be investigated.

Appl Physiol Nutr Metab. 2017 May 3. One Night of Sleep Restriction Following Heavy Exercise Impairs 3-km Cycling Time Trial Performance in the Morning.