疲劳是人们向医生、朋友和亲属最常抱怨的问题之一。现代疲劳症的原因各种各样，只是很少与过量的体力消耗挂起钩来。相对人数不多的整天从事重体力劳动的那些人几乎从来不抱怨劳累，也许因为他们预料到会感到疲劳。今天，医生报告说，疲倦更可能是由于活动不足所致，而不是活动过量所引起的。其实，增加体力活动常常是为治愈人们体力衰退所开的一个药方。
Fatigue is one of the most common complains brought to doctors, friends and relatives. The causes of modern-day fatigue are diverse and only rarely related to excess physical exertion. The relatively few who do heavy labor all day long almost never complain about being tired, perhaps because they expect to be. Today, physicians report, tiredness is more likely a consequence of under-exertion than of wearing yourself down with over-activity. In fact, increased physical activity is often prescribed as a cure for sinking energy.
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