Prolonged exercise at ventilatory threshold elicited similar cardiovascular responses in boys and men, with heart rate increasing by 9.5% and 13.6% and stroke volume decreasing by 8.8% and 11.6%.
Cross-Sectional (n=18)
Do cardiovascular responses during prolonged exercise at ventilatory threshold differ between boys and men?
Cardiovascular drift during prolonged exercise at ventilatory threshold is similar in magnitude between boys and men.
PURPOSE: The purpose of this study was to examine the cardiovascular responses during prolonged exercise in boys and men at an intensity set relative to ventilatory threshold (VT). METHODS: Eight boys (10-13 yr) and 10 men (18-25 yr) completed an orientation trial, a maximal exercise test, and a 40-min submaximal exercise bout at an intensity equal to the VO2 at VT (approximately 64.5% VO2max). RESULTS: Heart rate (HR) was higher and stroke volume (SV) was lower in the boys compared with the men (P 0.05). In men, mean arterial blood pressure was higher (P 0.05). From 0 to 40 min, the decrease in plasma volume was significantly greater in the men (-10.2%) than the boys (-5.7%) but was unrelated to the changes in SV in either group (P > 0.05). CONCLUSION: In conclusion, the cardiovascular responses during prolonged exercise are similar in boys and men, although there is a tendency for the magnitude of cardiovascular drift to be greater in the men.
Cheatham et al. (Thu,) reported a cross-sectional. Prolonged exercise at ventilatory threshold vs. Boys vs Men was evaluated on Cardiovascular responses (heart rate, stroke volume, cardiac output). Prolonged exercise at ventilatory threshold elicited similar cardiovascular responses in boys and men, with heart rate increasing by 9.5% and 13.6% and stroke volume decreasing by 8.8% and 11.6%.