A self-paced step test to predict aerobic fitness in older adults in the primary care clinic

被引:80
作者
Petrella, RJ
Koval, JJ
Cunningham, DA
Paterson, DH
机构
[1] Lawson Res Inst, Ctr Act & Ageing, London, ON N6G 2M3, Canada
[2] Lawson Res Inst, Dept Family Med, London, ON N6G 2M3, Canada
[3] Lawson Res Inst, Dept Phys Med & Rehabil, London, ON N6G 2M3, Canada
[4] Lawson Res Inst, Dept Epidemiol & Biostat, London, ON N6G 2M3, Canada
[5] Lawson Res Inst, Dept Physiol, London, ON N6G 2M3, Canada
[6] Lawson Res Inst, Fac Med, Sch Kinesiol, Fac Hlth Sci, London, ON N6G 2M3, Canada
关键词
step test; predicting aerobic capacity; older; primary care;
D O I
10.1046/j.1532-5415.2001.49124.x
中图分类号
R592 [老年病学]; C [社会科学总论];
学科分类号
03 ; 0303 ; 100203 ;
摘要
OBJECTIVES: To study the potential usefulness of a sub-maximal self-paced step test as a prediction of maximal aerobic capacity (VO(2)max) in older adults in the primary care setting. DESIGN: Data were collected during a prospective randomized study of an exercise program. SETTING: Four university family medical clinics in London, Ontario, Canada. PARTICIPANTS: A random sample of 240 healthy older (greater than or equal to 65) men (n = 118) and women (n = 122) from four family medical clinics underwent self-paced step testing in the clinic with a family physician (n = 16), and step testing and a maximal exercise treadmill test with measurement of respired gases in an exercise laboratory. Testing was done in random order (clinic/laboratory) separated by 2 weeks and then repeated at 52 weeks, following introduction of an exercise program. Relationships between outcome variables were examined by Pearson correlation coefficients while prediction of VO(2)max was examined using multivariate regression analysis. Cross-validation with 30 age-matched hypertensive and 40 age-matched post-hip arthroplasty patients was used to test the accuracy of the predictive models. MEASUREMENTS: Measured VO(2)max, predicted VO(2)max step test time, step test heart rate, body mass index (BMI), and O-2 pulse. RESULTS: Two hundred women (n = 108) and men (n = 92) completed both the initial and 52-week assessments. Stepping time, heart rate, age, BMI, and O-2 pulse were strongly associated with VO(2)max for both a normal and a fast step pace and were chosen to develop the predictive model. Normal step-pace correlation with VO(2)max (ml/kg/min) was no different (female 0.93: male 0.91) from fast pace (0.95:0.90) with no difference between clinic and laboratory measurement at baseline or 52 weeks. Cross-validation showed no significant difference from the main group using the predictive model. CONCLUSIONS: The self-paced step test is a safe and simple clinical instrument that strongly and reliably predicts VO(2)max, is sensitive to change, and is generalizable in the family practice setting among community-dwelling older adults differing in fitness and health status.
引用
收藏
页码:632 / 638
页数:7
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