Davis H S, MacPherson K, Merry H R, Wentzel C, Rockwood K
Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
Int Psychogeriatr. 2001;13 Supp 1:177-82. doi: 10.1017/s1041610202008128.
Regular exercise in elderly people has beneficial health effects. We examined exercise frequency and intensity from the Canadian Study of Health and Aging Risk Factor Questionnaire (RFQ). The reliability and validity of these two questions individually, and when combined to form a scale, are reported. Agreement between the self-administered RFQ and an interviewer-administered Add-on Study was examined using intraclass correlations, which were 0.80 for frequency (95% CI 0.77-0.82, p < .001) and 0.75 for intensity (95% CI 0.71-0.78, p = .012). Individuals reporting high levels of exercise frequency, intensity, and a combination of the two showed a smaller proportion of adverse health markers than those reporting no regular exercise. Predictive validity assessed by Cox proportional hazards modeling of mortality showed that the high and moderate levels of frequency, intensity, and combined exercise groups differed significantly (all p < .001) from the no exercise group. We have found that these exercise questions, though simple, appear reliable and valid. The finding that even comparatively crude exercise questions can demonstrate an important relationship to death suggests that the signal for exercise is a strong one, and future studies should seek to better examine mechanisms by which exercise benefit is conferred.
老年人经常锻炼对健康有益。我们通过加拿大健康与老龄化风险因素调查问卷（RFQ）来研究锻炼频率和强度。报告了这两个问题单独以及合并形成一个量表时的信度和效度。使用组内相关系数检验了自行填写的RFQ与访谈员实施的附加研究之间的一致性，频率的组内相关系数为0.80（95%置信区间0.77 - 0.82，p <.001），强度的组内相关系数为0.75（95%置信区间0.71 - 0.78，p =.012）。报告锻炼频率、强度高以及两者都高的个体，与那些报告没有定期锻炼的个体相比，不良健康指标的比例更小。通过Cox比例风险模型评估死亡率的预测效度表明，高、中水平的频率、强度以及综合锻炼组与不锻炼组有显著差异（所有p <.001）。我们发现这些锻炼问题虽然简单，但似乎可靠且有效。即使是相对粗略的锻炼问题也能显示出与死亡的重要关系，这一发现表明锻炼的信号很强，未来的研究应该更好地探究锻炼带来益处的机制。
