心脏泵血功能与无氧阈关系的探讨

THE RELATIONSHIP BETWEEN CARDIAC EJECTION AND ANEAROBIC THRESHOLD

作者对男性少年的无氧阈和心输出量的测定中发现,在递增负荷运动中无氧阈的出现与心输出量增加速率减少有关;心脏泵血动能是影响无氧阈的重要因素,训练可增加前者,而后者在前者增加后才得以提高。

The purpose of the study was to research into the relationship between cardiac ejection function and ventilatory anaerobic threshold (AT). 39 trained (X±SD; 14.5+0.57years) and 32 untrained (X±SD;14.83+0.85years) subjects took part in the study. Their cardiac output (Q) and ventilatory anearobic threshold (AT) during graded exercise were measured. It was concluded that (1) The AT, maximum Q andstroke volume of trained group were significantly kigher than those of the untrained group (p<0.01). (2)There is a significant correlation between maximum Q and anearobic threshold (AT-VO_2) (R=0.68, p<0.01).(3) The Q during graded exercise increased generally, but it was not constant and linear. There were steepincrease and transient decrease stages of Q during graded exercise. It was found that 79% of subjects' AToccured at the stages of Q slow increase and transient decrease. The results suggest that the function ofcardiac ejection affects the level of AT. The appearance of AT during graded exercise may rte to the decline of the incremental rate of Q.