疲劳期，指从事某一行为活动一段时间，开始出现情绪低落，热情减退的现象
并且同一时期同时报告精神和身体疲劳的下降了81%。
The researchers also found an 81% drop in reports of both mental and physical fatigue over the same time period.
不幸的是，如果您不对此作出调整，您将被迫减速---由于长距离跑末端（和恢复期）的疲劳。
Unfortunately, if you don't make this adjustment it will be made for you—due to fatigue at the end of the run (and in recovery).
证明在体力劳动中，心率恢复期和动态心率与体力疲劳程度之间存在着密切的联系。
The results proved that there was close relationship between the restoration of heart rate and dynamic heart rate and the intensity of physical fatigue.
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