In a hot-dry environment racewalking increases the risk of hyperthermia in comparison to when running at a similar velocity.
The purpose of this study was to determine if in a hot-dry environment, racewalking increases intestinal temperature (T(int)) above the levels observed when running either at the same velocity or at a similar rate of heat production. Nine trained racewalkers exercised for 60 min in a hot-dry environment (30.0 ± 1.4°C; 33 ± 8% relative humidity; 2.4 m s(-1) air speed) on three separate occasions: (1) racewalking at 10.9 ± 1.0 km h(-1) (Walk), (2) running at the same velocity (RunVel) and (3) running at 13 ± 1.8 km h(-1) to obtain a similar [Formula: see text] than during Walk (Run[Formula: see text]). As designed, energy expenditure rate was similar during Walk and Run[Formula: see text], but lower during RunVel (842 ± 78 and 827 ± 75 vs. 713 ± 55 W; p < 0.01). Final T(int) was lower during RunVel than during both Walk and Run[Formula: see text] (38.4 ± 0.3 vs. 39.2 ± 0.4 and 39.0 ± 0.4°C; p < 0.01). Heart rate and sweat rate were also lower during RunVel than during Walk and Run[Formula: see text] (i.e. heart rate 159 ± 13 vs. 179 ± 11 and 181 ± 11 beats min(-1) and sweat rate 0.8 ± 0.3 vs. 1.1 ± 0.3 and 1.1 ± 0.3 L h(-1); p < 0.01). However, we could not detect differences in skin temperature among trials. In conclusion, our data indicate that in a hot-dry environment racewalking increases the risk of hyperthermia in comparison with when running at a similar velocity. However, exercise mode (walking vs. running) had no measurable impact on T(INT) or heat dissipation when matched for energy expenditure.
Exercise Physiology Laboratory at Toledo, University of Castilla-La Mancha, Avda. Carlos III, s/n., 45071 Toledo, Spain. Ricardo.Mora@uclm.es
Ricardo
R
Mora-Rodriguez
Juan F
JF
Ortega
Nassim
N
Hamouti
D000054:Acceleration; D000293:Adolescent; D000328:Adult; D001833:Body Temperature Regulation; D055864:Droughts; D004777:Environment; D005260:Female; D005334:Fever / Q000453:epidemiology / Q000209:etiology*; D006358:Hot Temperature; D006801:Humans; D006813:Humidity; D008297:Male; D012307:Risk Factors; D012420:Running / Q000502:physiology*; D016138:Walking / Q000502:physiology*; D055815:Young Adult