Hypercapnic Chemosensitivity in Long Distance Runners

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It has been reported that the decreased hypercapnic chemosensitivity was prominently found in endurance athletes, but no consistent finding has been obtained. The purpose of this study was to confirm the decreased hypercapnic ventilatory response (HCVR) in long distance runners, and to determine its potential contribution to endurance exercise capacity. Five endurance athletes (EA), five non-endurance athletes (NEA) and five control subjects (CON) participated in this study. HCVR was measured by the CO_2 rebreathing method. Each subject performed a incremental exercise on a bicycle ergometer in order to measure the maximal oxygen uptake (V^^._<O2>max) and the anaerobic threshold (AT), and to assess the ventilatory responses to exercise. There was a significant difference of HCVR between EA and CON (1.45±0.37 vs 2.40±0.38 1/min/mmHg), while mean value in NEA (1.86±0.68 1/min/mmHg) was slightly lower than that in CON, but not significant. It was found that HCVR positively correlated to the ventilatory responses during submaximal exercise (r=0.609, p<0.05 for ΔV^^._E/V^^._<CO2>, r=0.736, p<0.01 for Δ^^._E/V^^._<O2>) and the ventilatory equivalents for CO_2 and O_2 at maximal exercise (r=0.653, p<0.01 for V^^._E/V^^._<CO2>, r=0.773, p<0.01 for V^^._E/V^^._<O2>). In addition, there was a significant, inverse correlation between V^^._<O2>max and HCVR (r=-0.556, p<0.05). From these results, it was suggested that the decreased hypercapnic chemosensitivity as well as V^^._<O2>max in long distance runners might be a prerequisite for the success in endurance competition, and also provided a potential contribution to endurance exercise capacity.
鹿児島国際大学の論文
1988-07-15

Hypercapnic Chemosensitivity in Long Distance Runners

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