Time of Day Influences the Environmental Effects on Muscle Force and Contractility

Racinais, Sébastien; Blonc, Stéphen; Jonville, Sophie; Hue, Olivier

doi:10.1249/01.mss.0000149885.82163.9f

Cited by 84 publications

(83 citation statements)

References 18 publications

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“…One such factor is body temperature. By raising body temperature in a warm environment, diurnal variation can be reduced or eliminated [65][66][67] . Similarly, a warm environment improves diurnal variation in the morning 68) .…”

Section: Temporal Effectiveness Of Exercise Training and Sportsmentioning

confidence: 99%

Role of biological rhythms in the performance of physical activity

Sato

Ida

Kojima

2017

JPFSM

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Section: Temporal Effectiveness Of Exercise Training and Sportsmentioning

confidence: 99%

Role of biological rhythms in the performance of physical activity

Sato

Ida

Kojima

2017

JPFSM

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“…The effects of the circadian rhythm and time of day on short-term maximal exercises (≤1 min) involving anaerobic metabolism have been well investigated (Lericollais et al, 2009;Nicolas et al, 2005;Racinais et al, 2005aRacinais et al, , 2005bSouissi et al, 2004Souissi et al, , 2007aSouissi et al, , 2007bSouissi et al, , 2008. During the Wingate test, peak power (P peak ) and mean power (P mean ) fluctuate with time-of-day, with the circadian acrophase (peak) at 17:24 ± 00:36 h and 18:00 ± 01:01 h (mean ± SD), respectively, and an amplitude of 7.6 ± 0.8% and 11.3 ± 1.1% (mean ± SD), respectively (Souissi et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, the underlying mechanisms of these time-of-day effects are still under discussion. Even if the circadian rhythm in core temperature is not necessarily the cause of the rhythm in muscle performance (Waterhouse et al, 2007), some studies have suggested that the simultaneous increases in central body temperature (assessed by oral or rectal measurements) and muscular power are causally related because the diurnal increase in central temperature may exert a beneficial passive warm-up effect (Bernard et al, 1998;Melhim, 1993;Racinais et al, 2005aRacinais et al, , 2005b. Although the exact mechanisms to explain this relationship are not known, it has been suggested that higher body temperature may enhance metabolic reactions, increase the extensibility of connective tissue, reduce muscle viscosity, and increase conduction velocity of action potentials (Shephard, 1984).…”

Section: Introductionmentioning

confidence: 99%

Diurnal Variation in Wingate Test Performances: Influence of Active Warm-Up

Souissi

Driss

Chamari

et al. 2010

Chronobiology International

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The purpose of the present study was to examine the effects of active warm-up duration on the diurnal fluctuations in anaerobic performances. Twelve physical education students performed a medical stress test ( progressive test up to exhaustion) and four Wingate tests (measurement of peak power [P peak ], mean power [P mean ], and fatigue index during an all-out 30 s cycling exercise). The tests were performed in separate sessions (minimum interval = 36 h) in a balanced and randomized design at 08:00 and 18:00 h, either after a 5 min (5-AWU) or a 15 min active warm-up (15-AWU). AWU consisted of pedaling at 50% of the power output at the last stage of the stress exhausting test. Rectal temperature was collected throughout the sessions. A two-way ANOVA (warm-up × time of day) revealed a significant interaction for P peak (F (1.11) = 6.48, p < 0.05) and P mean (F (1.11) = 5.84, p < 0.05): the time-of-day effect was significant ( p < 0.001) in contrast with the effect of warm-up duration ( p > 0.05). P peak and P mean improved significantly from morning to afternoon after both 5-AWU and 15-AWU, but the effect of warm-up duration was significant in the morning only. Indeed, the values of P peak or P mean were the same after both warmup protocols in the afternoon. For rectal temperature, there was no interaction between time-of-day and warm-up duration. Rectal temperature before and after both the warm-up protocols was higher in the afternoon, and the effect of warm-up duration on temperature was similar at 08:00 and 18:00 h. In conclusion, the interpretation of the results of the anaerobic performance tests should take into account time-of-day and warm-up procedures. Longer warm-up protocols are

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“…It must, however, be noted that their study was not primarily designed to address the effect of time of day. Hence, the acute loadings and biopsy samplings were not scheduled to early morning and late afternoon hours, when diurnal minimum and maximum in neuromuscular performance is typically found, respectively (12,26,32,33,35). Furthermore, early morning and late afternoon hours are also when hormonal signalling is dramatically different (e.g., cortisol to testosterone ratio -for a review see (16)).…”

mentioning

confidence: 99%

Effects of time of day on resistance exercise-induced anabolic signaling in skeletal muscle

Sedliak

Zeman

Buzgó

et al. 2013

Biological Rhythm Research

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. (2013). Effects of time of day on resistance exerciseinduced anabolic signaling in skeletal muscle. Biological rhythm research, 44, s. 756-770. Dette er siste tekst-versjon av artikkelen, og den kan inneholde små forskjeller fra forlagets pdf-versjon. Forlagets pdf-versjon finner du på www.tandfonline.com: http://dx.doi.org/10. 1080/09291016.2012.740314 This is the final text version of the article, and it may contain minor differences from the journal's pdf version. The original publication is available at www.tandfonline.com: http://dx.doi.org/10. 1080/09291016.2012.740314 Effects of time of day on resistance exercise-induced anabolic signalling in skeletal muscle IntroductionTime of day has been shown to affect various indices related to neuromuscular performance in both acute responses to a bout of resistance exercise and long-term adaptations to resistance training. For instance, muscle strength is typically lower in the morning compared to the afternoon (for a review see (10)). However, lower neuromuscular performance in the morning can be improved to the afternoon levels by regularly training in the morning hours over the period of several weeks (34,35).Whether the hypertrophic adaptation of skeletal muscle to resistance training also is affected by the time-of-day-specific training, is less studied. To our best knowledge, the only study performed on humans found a tendency to smaller gains in muscle size when repeatedly training in the morning compared to the late afternoon hours (36). Although statistically insignificant, subjects training in the afternoon hours increased their m.quadriceps femoris volume, measured by magnetic resonance imaging, on average 30% more compared to their counterparts in the morning training group (36). One of the possible mechanisms contributing to the above-mentioned time-of-day-dependent training adaptations is signalling pathways involved in the control of protein synthesis and protein degradation.In general, muscle hypertrophy/atrophy is a net result of an increase in protein synthesis minus protein degradation. A single bout of resistance exercise is a potent stimulus for increasing the post-exercise rate of protein synthesis per se, both in the acute recovery phase and lasting up to 48 hours (24,29). Phosphorylation of specific proteins in protein kinase B/muscle target of rapamycin/p70 ribosomal S6 kinase signalling pathway (Akt/mTOR/p70S6K) and to some extent also in mitogen-activated protein kinases (MAPK) signalling pathway has been shown to positively regulate muscle growth (2,37,40). Further, resistance exercise primarily aimed at increasing muscle hypertrophy is a potent stimulus to increase mTOR and MAPK signalling (9,18,19,40). At least signalling through rapamycin sensitive mTOR complex 1 (mTORC1) is needed to induce protein synthesis after resistance exercise (9). However, there are very limited data available addressing whether and how the activation of these signalling pathways can be influenced by a single bout of exercise or repeated resistan...

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Time of Day Influences the Environmental Effects on Muscle Force and Contractility

Cited by 84 publications

References 18 publications

Role of biological rhythms in the performance of physical activity

Role of biological rhythms in the performance of physical activity

Diurnal Variation in Wingate Test Performances: Influence of Active Warm-Up

Effects of time of day on resistance exercise-induced anabolic signaling in skeletal muscle

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