This study investigated whether 30 min of acute hot exposure has an additional passive warm-up effect for the improvement in muscle performance in a moderately warm and humid environment. We also sought to determine whether this effect is dependent on the diurnal variation in body temperature. Nine male subjects (age: 31.9 [± 5] years, height: 177 [± 6] cm, body mass: 69.3 [± 10] kg) were tested (CMJ, cycling sprints, and isokinetic contractions of the knee flexors and extensors) in a moderately warm and humid environment (24 [± 1] °C and 70 [± 4]% rh) with and without acute heat exposure (30 min of rest in a sauna at 76 [± 2] °C and 27 [±1]% rh), both in the morning (07:00-09:00h) and in the evening (17:00-19:00h). Our results indicated a significant effect of both time-of-day and acute heat exposure on leg skin temperature (p < 0.01) but failed to show any effect of time-of-day or acute heat exposure on the various evaluated parameters (CMJ: speed, force, power and height; cycling power: over a half pedal revolution and a total pedal revolution; isokinetic torque: knee extensor and flexor muscles at 4.19 rad · s-1, 3.14 rad · s -1, 2.09 rad · s-1, and 1.05 rad · s -1). In conclusion, our data suggest that 30 min of acute hot exposure does not have any passive warm-up effect in a moderately warm and humid environment. Furthermore, the diurnal variation in body temperature has no passive warm-up effect in a moderately warm and humid or in an extremely hot environment. © Georg Thieme Verlag KG.
CITATION STYLE
Racinais, S., Chamari, K., Hachana, Y., Bartagi, Z., Blonc, S., & Hue, O. (2006). Effect of an acute hot and dry exposure in moderately warm and humid environment on muscle performance at different times of day. International Journal of Sports Medicine, 27(1), 49–54. https://doi.org/10.1055/s-2005-837503
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