研究表明，每周进行两个半小时剧烈运动（每周建议剧烈运动量的两倍）的人获得的益处更大一点，进一步将死亡风险降低了2%至4%。
However, fitness fanatics who do more than four times the recommended amount of vigorous weekly exercise - 300 minutes, or five hours - do not get any additional benefit, data show.
然而，数据显示，每周进行5小时剧烈运动（每周建议剧烈运动量四倍以上）的健身狂并没有额外获益。
Benefit of prolonged intense exercise 'remains unclear'
长时间剧烈运动的益处“尚不清楚”
The same trend was seen for moderate activities, including walking. Ten hours of moderate exercise - four times the recommended weekly activity level - had no benefits, but also no harms.
走路等适度运动也呈现出同样的趋势。十个小时的适度运动（每周建议运动量的4倍）既没有益处，也没有害处。
In their study, published in the journal Circulation, the researchers wrote: “Higher levels of either long-term leisure-time vigorous physical activity (more than 300 minutes a week) or moderate physical activity (more than 600 minutes per week) did not clearly show further lower all-cause, cardiovascular disease, and non-cardiovascular disease mortality or harm.”
该研究发表在《循环》杂志上，研究人员写道：“无论是长期的高强度剧烈运动（每周超过300分钟）还是适度活动（每周超过600分钟），都没有明确证据证明能进一步降低全因死亡率，无论是心血管疾病导致的，还是非心血管疾导致的死亡。”
