점진부하 운동에서 중고교 엘리트 사이클 선수들의 유산소능력과 폐환기 반응

This study was designed to examine the aerobic capacity and ventilatory response during an incremental exercise in elite high school cyclists. Twelve boys (17±1 yr, 175±5 ㎝, 70±9 ㎏) participated in anthropometric measurements, incremental exercise testing, and pulmonary function tests. During incremental exercise testing using a cycle ergometer, their maximal oxygen uptake (VO₂max), maximal power output, ventilation, ventilatory equivalents for oxygen (V E /VO₂) and carbon dioxide (V E /VCO₂), respiratory rate, and tidal volume were measured. Time variables such as inspiratory time (Ti), expiratory time (Te), breathing time (Tb), and inspiratory duty cycle (Ti/Tb), as well as inspiratory flow rate (V T /Ti) were assessed. Pulmonary function of vital capacity (FVC), forced expiratory volume in one second (FEV₁), FEV₁/FVC, and peak expiratory flow were evaluated. Their VO₂max, maximal heart rate, and Wmax were 57.5±3.9 ㎖ㆍ㎏ -1 ·min -1 , 194.1±8.6 beat·min -1 , and 452 W, respectively. VO₂max was not related to any anthropometric parameters. Most ventilatory variables progressively increased with exercise intensity. As intensity increased, Ti, Tb, Tb decreased while Ti/Tb was maintained. Below an intensity of 250 W, height, weight, body mass index, and body surface were highly correlated with V T /Ti and Ti/Tb (p T /Ti may be related to exercise endurance capacity, but Ti/Tb was similar to adult cyclists.