Ekkekakis Panteleimon, Hall Eric E, Petruzzello Steven J
Department of Health and Human Performance, Iowa State University, 235 Barbara E. Forker Building, Ames, IA 50011, USA.
Prev Med. 2004 Feb;38(2):149-59. doi: 10.1016/j.ypmed.2003.09.038.
The high rates of dropout from exercise programs may be attributed in part to the poor ability of most individuals to accurately self-monitor and self-regulate their exercise intensity. The point of transition from aerobic to anaerobic metabolism may be an appropriate level of exercise training intensity as it appears to be effective and safe for a variety of populations. Possible practical markers of this event were compared.
Two samples of 30 young and healthy volunteers each participated in incremental treadmill tests until volitional exhaustion. The ventilatory threshold, a noninvasive estimate of the aerobic-anaerobic transition, was identified from gas exchange data. Heart rate, self-ratings of affective valence (pleasure-displeasure), perceived activation, and perceived exertion were recorded every minute.
In both samples, heart rate, perceived activation, and perceived exertion rose continuously, whereas the ratings of affective valence showed a pattern of quadratic decline, initiated once the ventilatory threshold was exceeded.
Exercise intensity that exceeds the point of transition from aerobic to anaerobic metabolism is accompanied by a quadratic decline in affective valence. This marker may be useful in aiding exercisers to recognize the transition to anaerobic metabolism and, thus, more effectively self-monitor and self-regulate the intensity of their efforts.
运动项目的高退出率可能部分归因于大多数人准确自我监测和自我调节运动强度的能力较差。从有氧代谢过渡到无氧代谢的点可能是一个合适的运动训练强度水平，因为它对各种人群似乎都是有效且安全的。对这一事件可能的实用标志物进行了比较。
两组各30名年轻健康志愿者参加递增式跑步机测试，直至自愿力竭。从气体交换数据中确定通气阈值，这是对有氧-无氧转换的一种无创估计。每分钟记录心率、情感效价（愉悦-不愉悦）的自我评分、感知激活和感知运动用力程度。
在两组样本中，心率、感知激活和感知运动用力程度持续上升，而情感效价评分在超过通气阈值后呈现二次下降模式。
超过从有氧代谢到无氧代谢转换点的运动强度伴随着情感效价的二次下降。这一标志物可能有助于锻炼者识别向无氧代谢的转换，从而更有效地自我监测和自我调节运动强度。
