Department of Population Science, American Cancer Society, Atlanta, GA.
Med Sci Sports Exerc. 2021 May 1;53(5):888-893. doi: 10.1249/MSS.0000000000002547.
This study examined the 1-yr reliability and construct validity of survey items relating to time spent on muscle-strengthening exercise (MSE) in a subset of a large prospective cohort.
Participants (n = 293 men, 433 women; age, 32-73 yr) were selected from the Cancer Prevention Study-3. Information was collected using a 1-yr presurvey and postsurvey and four 7-d diaries throughout the year. The presurvey and postsurveys collected time spent on MSE in two ways: one question captured MSE activities performed during a typical 24-h period (24-h survey), and another question captured leisure-time physical activities performed in hours per week and months per year (LTPA survey). Time spent on MSE using the LTPA survey was calculated for individual MSE items and summed for total MSE time. One-year reliability was assessed by comparing the responses between the presurvey and postsurvey using Spearman's correlation coefficients. Construct validity was assessed by computing Spearman's correlation coefficients between responses from the postsurvey items and the diary. Additional analyses were conducted to examine whether reliability or validity varied by sociodemographic factors.
Reliability estimates for all MSE items were moderate (≥0.40) or strong (≥0.60) overall and across demographic strata. Reliability estimates were strongest for total MSE on the LTPA survey (Spearman ρ = 0.75; 95% confidence interval (CI), 0.71-0.78) compared with the 24-h survey (0.59; 95% CI, 0.54-0.64). In contrast, the validity estimates were similarly strong for the total MSE on the LTPA survey (Spearman ρ = 0.71; 95% CI, 0.67-0.75) and the 24-h survey (Spearman ρ = 0.68; 95% CI, 0.64-0.72).
The CPS-3 surveys have acceptable 1-yr reliability and validity for self-reported time spent on MSE. Reliability and validity estimates are acceptable across all sociodemographic subgroups.
本研究通过对一个大型前瞻性队列的子样本进行调查，检验了与肌肉强化运动（MSE）时间相关的调查项目的 1 年可靠性和结构有效性。
参与者（n=293 名男性，433 名女性；年龄 32-73 岁）从癌症预防研究-3 中选择。通过 1 年预调查和后调查以及全年 4 次 7 天日记收集信息。预调查和后调查以两种方式收集 MSE 时间：一个问题记录了典型 24 小时周期内进行的 MSE 活动（24 小时调查），另一个问题记录了每周和每年进行的闲暇时间体育活动小时数（LTPA 调查）。使用 LTPA 调查计算每个 MSE 项目的 MSE 时间，并对总 MSE 时间进行汇总。通过比较预调查和后调查的回答，使用斯皮尔曼相关系数评估 1 年的可靠性。通过计算后调查项目的回答与日记之间的斯皮尔曼相关系数来评估结构有效性。进行了额外的分析，以检查可靠性或有效性是否因社会人口因素而有所不同。
所有 MSE 项目的可靠性估计值总体上和跨人口统计学群体均为中度（≥0.40）或高度（≥0.60）。LTPA 调查中总 MSE 的可靠性估计值最强（斯皮尔曼ρ=0.75；95%置信区间（CI），0.71-0.78），而 24 小时调查的可靠性估计值为 0.59（95%CI，0.54-0.64）。相比之下，LTPA 调查中总 MSE 的有效性估计值和 24 小时调查相似（斯皮尔曼ρ=0.71；95%CI，0.67-0.75）。
CPS-3 调查具有可接受的 1 年可靠性和有效性，用于自我报告的 MSE 时间。可靠性和有效性估计值在所有社会人口统计学亚组中都是可接受的。
