Department of Kinesiology & Community Health, University of Illinois at Urbana-Champaign, 906 S Goodwin Ave, Urbana, IL 61801, USA.
BMC Public Health. 2010 Feb 8;10:59. doi: 10.1186/1471-2458-10-59.
Cardiorespiratory fitness (CRF) is associated with a decreased risk of all-cause mortality but is rarely assessed in medical settings due to burdens of time, cost, risk, and resources. The purpose of this study was to test the construct validity of a regression equation developed by Jurca and colleagues (2005) to estimate CRF without exercise testing in community dwelling older adults.
Participants (n = 172) aged 60 to 80 years with no contraindications to submaximal or maximal exercise testing completed a maximal graded exercise test (GXT) and the submaximal Rockport 1-mile walk test on separate occasions. Data included in the regression equation (age, sex, body mass index, resting heart rate, and physical activity) were obtained via measurement or self-report. Participants also reported presence of cardiovascular conditions.
The multiple R for the regression equation was .72, p < .001 and CRF estimated from this equation was significantly correlated with the MET value from the GXT (r = 0.66) and with CRF estimated from submaximal field testing (r = 0.67). All three CRF indices were significantly and inversely associated with reporting more cardiovascular conditions.
This research provides preliminary evidence that a non-exercise estimate of CRF is at least as valid as field test estimates of CRF and represents a low-risk, low-cost, and expedient method for estimating fitness in older adults.
心肺适能（CRF）与全因死亡率降低相关，但由于时间、成本、风险和资源的限制，在医疗环境中很少进行评估。本研究的目的是测试 Jurca 及其同事（2005 年）开发的回归方程在评估社区居住的老年人群中无需运动测试的 CRF 的结构效度。
年龄在 60 至 80 岁之间、无运动测试禁忌的参与者（n=172）分别完成了最大递增运动测试（GXT）和亚最大 Rockport 1 英里步行测试。回归方程中包含的数据（年龄、性别、体重指数、静息心率和体力活动）通过测量或自我报告获得。参与者还报告了心血管疾病的存在情况。
回归方程的多重 R 为.72，p<.001，并且该方程估计的 CRF 与 GXT 的 MET 值（r=0.66）和亚最大现场测试估计的 CRF（r=0.67）显著相关。这三个 CRF 指标均与报告更多心血管疾病的情况呈显著负相关。
这项研究提供了初步证据，表明非运动估计的 CRF 至少与现场测试估计的 CRF 一样有效，并且代表了一种在老年人中评估健康的低风险、低成本和快捷方法。
