Abstract
Cardiorespiratory fitness is an independent predictor of cardiovascular events in women; however, maximal oxygen consumption (VO2max) protocols are not always feasible. The Evaluation of Physical Activity Measures in Middle-Aged Women Study was a 6-week study designed to evaluate six physical activity (PA) measures in women, aged 45–65 years. We investigated the Ebbeling submaximal treadmill (EbbTM) protocol’s ability to reflect an active lifestyle in 66 women [median (IQR) age, 51.0 (48.0, 56.5) years]. Participants were screened using ACSM and AHA guidelines and classified as moderate or low cardiovascular risk. VO2max was estimated using the EbbTM in all participants (TEST1). Moderate risk women repeated the EbbTM (TEST2) while low risk completed a maximal treadmill test. Intraclass correlation coefficients (ICC) and minimal detectable change (MDC90) score were calculated to examine reliability. Spearman rank order or Pearson product-moment correlation coefficients were used to determine the association between estimated VO2max and physical fitness and activity measures. Estimated VO2max from the EbbTM protocol had excellent reproducibility [ICC = 0.95 (95% CI: 0.89, 0.98) and MDC90 was 1.62 mL kg−1 min−1. The EbbTM protocol was associated with measured VO2max (ρ = 0.48; p = 0.01) and was positively correlated with moderate- (ρ = 0.32; p = 0.02), vigorous- (ρ = 0.47; p = 0.0005) and moderate-to-vigorous-intensity PA (ρ = 0.36; p = 0.009), pedometer steps (ρ = 0.41; p = 0.002) and inversely correlated with waist circumference (ρ = −0.58; p < 0.0001), body fat (ρ = −0.55; p < 0.0001), and right leg endurance (ρ = −0.41; p = 0.003). The EbbTM protocol was shown to be reliable and associated with objective measures of fitness and PA in healthy, middle-aged women.
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Acknowledgments
The authors would like to acknowledge the 66 dedicated PAW Study participants and the contributions of research technicians Rebecca Rankin, MS and Justin Leonard. This research was funded by the American College of Sports Medicine, Paffenbarger-Blair Endowment for Epidemiological Research on Physical Activity that was awarded to Dr. Kelley Pettee Gabriel (2007). American College of Sports Medicine (2007 Paffenbarger-Blair Endowment for Epidemiological Research on Physical Activity).
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Communicated by Klaas Westerterp.
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Mitros, M., Gabriel, K.P., Ainsworth, B. et al. Comprehensive evaluation of a single-stage submaximal treadmill walking protocol in healthy, middle-aged women. Eur J Appl Physiol 111, 47–56 (2011). https://doi.org/10.1007/s00421-010-1615-3
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DOI: https://doi.org/10.1007/s00421-010-1615-3