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1 School of Human Kinetics, University of Ottawa, Ottawa, Canada
* To whom correspondence should be addressed. E-mail: ojay{at}uottawa.ca.
Factors associated with blood pressure regulation during recovery from exercise dramatically influence core temperature regulation. However, it is unknown if gender-related differences in postexercise hemodynamics affect core and muscle temperature response. Sixteen participants (8 males, 8 females) completed an incremental isotonic test on a Kin-Com isokinetic apparatus to determine their activity specific peak oxygen consumption during bilateral knee extensions (VO2sp). On a separate day, participants performed 15-min of isolated bilateral knee extensions at a moderate (60% VO2sp) exercise intensity followed by 90-min recovery. Esophageal temperature (Tes), mean arterial pressure (MAP), muscle temperature at 4 depths in the active vastus medialis (TVM) and 3 depths in the inactive triceps brachii (TTB) were measured concurrently with sweat rate and cutaneous vascular conductance (CVC). Relative to the pre-exercise resting Tes of 36.7°C (SD 0.1), between 10 and 50-min of recovery Tes was 0.19°C (SD 0.02) higher for females than males (p=0.037). All measurements of TVM (0.036 > p > 0.014) and TTB (0.048 > p > 0.008) were higher for females during the initial 30-min of recovery by between 0.46°C to 0.64°C for TVM and by 0.53°C to 0.70°C for TTB. In parallel, females showed a 5 to 7 mmHg greater reduction in MAP during recovery relative to males (p=0.002) and a significantly lower CVC (p=0.020) and sweat rate (p=0.034). It is therefore concluded that females demonstrate a greater and more prolonged elevation in postexercise esophageal temperature and active and inactive muscle temperatures which is paralleled by a greater postexercise hypotensive response.
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