January 09, 2017
Association of “Weekend Warrior” and Other Leisure Time Physical Activity Patterns With Risks for All-Cause, Cardiovascular Disease, and Cancer Mortality
http://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2596007
平日要運動也許橋不出時間，大家常在週末運動，然而，把運動時間集中在週末，當「週末勇士」，這樣效果好嗎（和一般平均分散日子運動而言）？
這是一個 observational study，64,000 U.K. adults aged 40歲以上，from 1994 through 2008。
分成四組：
1) Inactive: no moderate-to-vigorous activity
2) Insufficiently active: <150 150="" activities="" activity="" and="" div="" in="" min="" minutes="" moderate-intensity="" of="" vigorous-intensity="" week="" wk="">
3) "Weekend warrior": ≥150 min/wk of moderate-intensity or ≥75 min/wk of vigorous-intensity activity from 1–2 sessions
4) Regularly active: ≥150 min/wk of moderate-intensity or ≥75 min/wk of vigorous-intensity activity from 3 or more sessions
9年追蹤，8800人死亡，其中2800人因cardiovascular disease (CVD)，2500人因cancer。
和inactive adults相比,
1) insufficiently active adults and weekend warriors had significant risk reductions in all-cause mortality (about 30%) and CVD mortality (about 40%); regularly active adults had slightly greater risk reductions.
2) L-shaped association between physical activity and mortality
有運動比沒運動者效果會差很大，然而把強度加很大時，死亡率的改善就不是那麼明顯了。
3) Reductions in cancer mortality ranged from 14% for insufficiently active adults to 21% for regularly active adults. (連癌症的死亡率也會下降)
4) Invited commentary
Can It Wait Until Then?
In response to the question of whether activity can wait for the weekend, the short answer is perhaps.
週末時要還是要排出時間來運動一下，當然平常能運動會更好。
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