[Comparison of male and female thermal, cardiac, and muscular responses induced by a prolonged run undertaken in a hot environment].
The aim of this study was to compare male and female thermal, cardiac, and muscular responses induced by a prolonged run undertaken in a hot environment. Twelve volunteers participated in this study. The first group consisted of 6 men and the second one consisted of 6 women. After determination of their VO(2)max and maximal aerobic velocity (MAV), each athlete completed a 40-min run at 65% MAV in a hot and dry environment (temperature 31-33 degrees C, relative humidity 30%). Immediately before and after the run, each subject performed two different vertical jumps, i.e., a squat jump (SJ) and a counter-movement jump (CMJ) on a force platform. Force, velocity, power, and jump height were measured during each jump. The completion of the run was associated with a significant loss (p < 0.001) of body mass (BM) and significant increases (p < 0.001) in heart rate, tympanic temperature, and lactate concentration ([La]). Muscle power was significantly improved (+9%, p < 0.05) during the SJ only in the women. A significant enhancement of this parameter was also demonstrated during the CMJ in both groups (men: +10%, p < 0.05; women: +8%, p < 0.01). Surprisingly, a comparison of thermal, cardiac, and muscular responses did not reveal any significant differences between the sexes. Moderate dehydration (-2.0 to -2.3% of BM) and a rise in core temperature (above 39.2 degrees C) induced by the 40-min run led to an improvement of muscular strength in both men and women. However, the results of this study did not reveal any significant between-sex differences in thermal, cardiac, and muscular responses after exercising in the heat.
Ftaiti
Foued
F
Institut Superieur du Sport et de l'Education Physique de Sfax, Route de laeroport, Sfax, Tunisie.
Kacem
Asma
A
Latiri
Imed
I
Ben Mdalla
Samia
S
Tabka
Zouhair
Z
Zouari
Nouri
N
Ellouze
Feriel
F
Grélot
Laurent
L
D000328:Adult; D001831:Body Temperature / Q000502:physiology*; D001835:Body Weight; D003681:Dehydration / Q000209:etiology / Q000503:physiopathology; D005260:Female; D006321:Heart / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D006813:Humidity; D019344:Lactic Acid / Q000097:blood; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology* / Q000503:physiopathology; D010101:Oxygen Consumption / Q000502:physiology; D012420:Running / Q000502:physiology*; D012727:Sex Characteristics; D013997:Time Factors; D014432:Tympanic Membrane / Q000502:physiology
D019344:Lactic Acid