每日步数和步数强度与美国成年人死亡率的关联
Pedro F Saint-Maurice1, Richard P Troiano2, David R Bassett3
1Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, Maryland.
JAMA
|March 25, 2020
概括
增加每天步数显著降低了40岁以上成年人的死亡风险. 每天走8000到12000步, 显著降低了全因死亡率, 凸显了步数对长寿的重要性.
科学领域:
- 公共卫生
- 流行病学
- 老年学
背景情况:
- 日常体育活动,特别是步数和强度与死亡风险之间的关系尚不完全理解.
- 之前的研究尚未确定加速计测量步骤和强度与所有原因,心血管疾病 (CVD) 或癌症死亡率之间的剂量反应关联.
研究的目的:
- 在美国40岁及以上的成年人中调查每日步数和步强度与全因,心血管疾病和癌症死亡率之间的剂量反应关系.
- 为了确定更高的步骤强度是否独立地与减少的死亡率相关,在计算了每天的总步骤后.
主要方法:
- 采用来自美国国家健康和营养检查调查 (2003-2006) 的代表性成年人样本的数据.
- 参与者佩戴加速计长达7天,以测量步数和强度 (节奏).
- 死亡率数据 (所有原因,心血管疾病,癌症) 通过2015年12月确定,对许多共同变量进行统计调整.
主要成果:
- 总共有4840名参与者被纳入,平均随访时间为10. 1年,在此期间发生了1165人死亡.
- 较高的每日步数与较低的全因死亡率有显著的关联:与4000步/天相比,每日8000步 (HR,0.49) 和12000步 (HR,0.35) 显著降低了风险.
- 经过每天步骤总数调整后,步骤强度 (峰值30分钟节奏) 与死亡率没有显著关联 (HR为最高与最低四分位数的0. 90).
结论:
- 在40岁及以上的美国成年人中,较高的每日步数与全因死亡率的显著降低有关.
- 步骤强度似乎没有提供超出每天步骤总数的额外死亡益处.
- 这些发现强调了提高每日步数以减少死亡风险对公共卫生的重要性.
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