Post-resistance training detraining: time-of-day effects on training and testing outcomes

作者：Chtourou Hamdi^*; Ammar Achraf; Nikolaidis Pantelis Theodoros; Karim Osama Abdel; Souissi Nizar; Chamari Karim; Chaouachi Anis

来源：Biological Rhythm Research, 2015, 46(6): 897-907.

DOI：10.1080/09291016.2015.1063204

• muscle strength
• muscle power
• sports
• time-of-day
• competitions

The aim of this study was to examine the effects of 3 and 5weeks of detraining after 14weeks of resistance training at a specific time of day on performances during the squat jump (SJ) and the maximal voluntary contraction (MVC). Thirty-one healthy male physical education students (age: 23.1 +/- 1.0years; height: 176.1 +/- 6.3cm; weight: 74.9 +/- 10.9kg) were randomly assigned to either a morning training group (MTG, training between 07:00 and 08:00h, n=10), an evening training group (ETG, training between 17:00 and 18:00h, n=11) or a control group (CG, no training, n=10). Participants then performed eight test sessions (twice per day, at 07:00 and 17:00h) over the course of four phases: during pre-training, immediately post-training, and after 3 and 5weeks of detraining. Before each test session, oral temperature was recorded. During the first 12weeks of resistance training, participants performed 3 sets of 10 repetitions to failure (10-RM) for 4 exercises (squat, leg press, leg extension and leg curl, with 2min of recovery between each exercise); during the last two weeks, training intensity increased to 8-RM with 3min of recovery between each exercise. Oral temperature was significantly higher at 17:00 than 07:00h during all test periods (p<0.05). Likewise, SJ and MVC performances were significantly higher at 17:00h than 07:00h during all four test days in ETG and CG, and before training and 3 and 5weeks after training in MTG (p<0.05). For both training groups, most SJ and MVC performances (except MTG at 07:00h and ETG at 17:00h) returned to baseline values after 5, but not after 3, weeks of detraining. This study showed that 14weeks of training at a specific time of day blunted the diurnal variation of MVC and SJ in the MTG. The improvement in performance brought about by resistance training was partially retained after 3weeks of detraining (unless training had taken place at a non-habitual time of day) but was lost after 5weeks of detraining. There was no effect of the time of training on core temperature.

• 出版日期2015-11-2