Institute of Medicine, University Centre Shrewsbury/University of Chester, The Guildhall, Frankwell Quay, Shrewsbury, UK.
Centre for Sports and Exercise Sciences, School of Biological Sciences, University of Essex, Colchester, UK.
Sports Med. 2016 Dec;46(12):1953-1962. doi: 10.1007/s40279-016-0521-1.
The incremental shuttle walk test (ISWT) is a standardised assessment for cardiac rehabilitation. Three studies have reported oxygen costs (VO)/metabolic equivalents (METs) of the ISWT. In spite of classic representations from these studies graphically showing curvilinear VO responses to incremented walking speeds, linear regression techniques (also used by the American College of Sports Medicine [ACSM]) have been used to estimate VO.
The two main aims of this study were to (i) resolve currently reported discrepancies in the ISWT VO-walking speed relationship, and (ii) derive an appropriate VO versus walking speed regression equation.
VO was measured continuously during an ISWT in 32 coronary heart disease [cardiac] rehabilitation (CHD-CR) participants and 30 age-matched controls.
Both CHD-CR and control group VO responses were curvilinear in nature. For CHD-CR VO = 4.4e. The integrated area under the curve (iAUC) VO across nine ISWT stages was greater in the CHD-CR group versus the control group (p < 0.001): CHD-CR = 423 (±86) ml·kg·min·km·h; control = 316 (±52) ml·kg·min·km·h.
CHD-CR group vs. control VO was up to 30 % greater at higher ISWT stages. The curvilinear nature of VO responses during the ISWT concur with classic studies reported over 100 years. VO estimates for walking using linear regression models (including the ACSM) clearly underestimate values in healthy and CHD-CR participants, and this study provides a resolution to this when the ISWT is used for CHD-CR populations.
递增穿梭步行测试（ISWT）是心脏康复的标准化评估。有三项研究报告了 ISWT 的耗氧量（VO）/代谢当量（MET）。尽管这些研究的经典图表显示了 VO 对递增步行速度的曲线反应，但线性回归技术（也被美国运动医学学院 [ACSM] 使用）已被用于估计 VO。
本研究的两个主要目的是（i）解决目前报告的 ISWT VO-步行速度关系中的差异，（ii）得出适当的 VO 与步行速度回归方程。
在 32 名冠心病[心脏]康复（CHD-CR）参与者和 30 名年龄匹配的对照组中，在 ISWT 期间连续测量 VO。
CHD-CR 和对照组的 VO 反应均呈曲线性质。对于 CHD-CR VO=4.4e。九个 ISWT 阶段的 VO 积分面积（iAUC）在 CHD-CR 组中大于对照组（p<0.001）：CHD-CR=423（±86）ml·kg·min·km·h；对照组=316（±52）ml·kg·min·km·h。
CHD-CR 组在较高的 ISWT 阶段的 VO 高达 30%。ISWT 期间 VO 反应的曲线性质与 100 多年前报告的经典研究一致。使用线性回归模型（包括 ACSM）估计步行的 VO 值明显低估了健康和 CHD-CR 参与者的值，本研究为 CHD-CR 人群使用 ISWT 时解决了这一问题。
