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發表於 2014-8-14 22:46:41
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本帖最後由 Ah_Wing 於 2014-8-14 22:54 編輯
我唔係想拗個研究啱唔啱，只係想指出份新聞同原文出入好大。研究報告經過傳媒簡化，翻譯，及錦上添花後，通常都被扭曲到亂七八糟。呢個話題係傳媒嘅特別喜好，唔知佢地係刻意誤導，還是睇唔明啲論文。運動效益升幅減少或倒退，並不等於對健康有害！假設唔做運動某人可能會活到X歲，做少少運動就可以活到X+10歲，再做多啲就可以活到X+20歲，但如果「做過龍」，就反而得X+5歲！啲人就話，死囉，做運動過多對身體有害，因為佢地用最高點嚟比較！呢樣唔係叫蝕，呢樣係叫賺唔夠！
我睇完嘅理解係（如果我有錯請指正），若比較死亡率，由冇運動至每日跑7.1k嘅運動量，死亡率會逐漸減低，會低至減63%（與冇運動比較），但係如果運動量再多，減幅便開始減少，減得12%。 如果個研究係可信，個結論只係每日跑7.1k運動量係對健康保健最有效，而跑多或少過7.1k就冇咁有效。
我逐句同佢駁：
1 天跑超過6.4公里就可能危害健康 <=== 呢句根本完全唔係原文嘅結論，講益處就用零運動做baseline比較，講害處就用7.1k/day做比較（仲有都唔知個6.4k係邊度嚟嘅）
研究說，每週跑超過48公里，運動好處就開始減少 <=== 呢句算佢寫得啱
至於把走路當運動的人，每天走超過74公里、相當於約每天10公里，就開始失去運動的益處。 <=== 啲數字又寫錯哂。而且有啲誤導，應個寫係個益處嘅增幅開始減少，咪寫到好似會有反效果咁...
「研究顯示，跑步或走路的益處並不會持續累積，一旦超過某個量，可能每週跑48公里以上，風險就會顯著增加。」 <=== 原文： "Running or walking decreases CVD mortality risk progressively at most levels of exercise in patients after a cardiac event, but the benefit of exercise on CVD mortality and IHD deaths is attenuated at the highest levels of exercise" ，"益處減少" 被譯成 "風險增加"
大家唔好聽我講，話哂我本身嘅立場都唔中立，想清楚了解應該自己去睇吓原本份論文，自己去理解。
http://www.mayoclinicproceedings.org/article/S0025-6196%2814%2900437-6/abstract
Increased Cardiovascular Disease Mortality Associated With Excessive Exercise in Heart Attack Survivors[url=]Paul T. Williams[/url], PhD,[url=]Paul D. Thompson[/url], MD
Published Online: August 12, 2014
DOI: http://dx.doi.org/10.1016/j.mayocp.2014.05.006
Publication stage: In Press Corrected Proof
AbstractObjective To test whether greater exercise is associated with progressively lower mortality after a cardiac event.
Patients and Methods We used Cox proportional hazard analyses to examine mortality vs estimated energy expended by running or walking measured as metabolic equivalents (3.5 mL O2/kg per min per day or metabolic equivalent of task-h/d [MET-h/d]) in 2377 self-identified heart attack survivors, where 1 MET-h/d is the energy equivalent of running 1 km/d. Mortality surveillance via the National Death Index included January 1991 through December 2008.
Results A total of 526 deaths occurred during an average prospective follow-up of 10.4 years, 376 (71.5%) of which were related to cardiovascular disease (CVD) (International Statistical Classification of Diseases, 10th Revision codes I00-I99). CVD-related mortality compared with the lowest exercise group decreased by 21% for 1.07 to 1.8 MET-h/d of running or walking (P=.11), 24% for 1.8 to 3.6 MET-h/d (P=.04), 50% for 3.6 to 5.4 MET-h/d (P=.001), and 63% for 5.4 to 7.2 MET-h/d (P<.001) but decreased only 12% for ≥7.2 MET-h/d (P=.68). These data represent a 15% average risk reduction per MET-h/d for CVD-related mortality through 7.2 MET-h/d (P<.001) and a 2.6-fold risk increase above 7.2 MET-h/d (P=.009). Relative to the risk reduction at 7.2 MET-h/d, the risk for ≥7.2 MET-h/d increased 3.2-fold (P=.006) for all ischemic heart disease (IHD)–related mortalities but was not significantly increased for non–IHD-CVD, arrhythmia-related CVD, or non–CVD-related mortalities.
Conclusion Running or walking decreases CVD mortality risk progressively at most levels of exercise in patients after a cardiac event, but the benefit of exercise on CVD mortality and IHD deaths is attenuated at the highest levels of exercise (running: above 7.1 km/d or walking briskly: 10.7 km/d).
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發表於 2014-8-14 15:45:07
