Estimation of oxygen uptake during fast running using accelerometry and heart rate
Estimation of oxygen uptake during fast running using accelerometry and heart rate
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DOI：
10.1249/01.mss.0000235884.71487.21
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发表时间：
2007-01-01
期刊：
影响因子：
--
通讯作者：
Pitsiladis, Yannis P.
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文献类型：
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作者：
Fudge, Barry W.;Wilson, John;Pitsiladis, Yannis P.
以前的调查报告说，加速计计数高原期间运行越来越快的速度。目的：旨在评估生物力学和/或器械限制是否会导致这种现象，以及在步行和跑步期间结合使用加速度计和心率生成摄氧量（VO 2）预测方程的可行性。方法：16名受试者在跑步机上完成两项运动试验。第一种是连续递增的意志耗竭试验，以确定解释阈值和峰值VO 2。第二个是步行（3，5和7公里）时的不连续增量运动试验。h（-1））和运行（8、10、12、14、16、18和20 km（.）h（-1），或直到意志耗尽）。受试者以每种速度完成3分钟的运动，然后恢复3-5分钟。在整个运动过程中，测量单轴和三轴加速度计的活动计数、心率和气体交换。结果：在步行过程中，所有加速度计输出随速度线性上升。在运行过程中，单轴加速度计输出平稳，而三轴输出线性上升，速度高达20公里（包括）。h（-1）。利用心率预测步行和跑步时的VO 2（R-2分别= 0.42和0.59），加速度计计数（R2分别为0.48-0.83和0.76），组合方法（R-2分别为0.54-0.85和0.80），并通过线性回归完成用个体数据校准的组合方法（R-2分别为0.99-1.00和0.99）。结论：单轴和三轴加速度计输出与步行过程中的速度呈线性关系。在跑步过程中，由于跑步的生物力学特性，单轴加速度计输出平稳，而三轴加速度计输出具有线性关系。组合方法预测VO 2优于单独的预测;受试者的单独校准数据进一步提高了VO 2估计。
Previous investigations have reported that accelerometer counts plateau during running at increasingly faster speeds. Purpose: To assess whether biomechanical and/or device limitations cause this phenomenon and the feasibility of generating oxygen uptake (VO2) prediction equations from the combined use of accelerometry and heart rate during walking and running. Methods: Sixteen endurance-trained subjects completed two exercise tests on a treadmill. The first was a continuous incremental test to volitional exhaustion to determine ventilatory threshold and peak VO2. The second was a discontinuous incremental exercise test while walking (3, 5, and 7 km(.)h(-1)) and running (8, 10, 12, 14, 16, 18, and 20 km(.)h(-1), or until volitional exhaustion). Subjects completed 3 min of exercise at each speed, followed by 3-5 min of recovery. Activity counts from uni- and triaxial accelerometers, heart rate, and gas exchange were measured throughout exercise. Results: All accelerometer outputs rose linearly with speed during walking. During running, uniaxial accelerometer outputs plateaued, whereas triaxial output rose linearly with speed up to and including 20 km(.)h(-1). Prediction of VO2 during walking and running using heart rate (R-2 = 0.42 and 0.59, respectively), accelerometer counts (R 2 = 0.48-0.83 and 0.76, respectively), the combined methodologies (R-2 = 0.54-0.85 and 0.80, respectively), and the combined methodologies calibrated with individual data (R-2 = 0.99-1.00 and 0.99, respectively) was completed by linear regression. Conclusions: Uni- and triaxial accelerometer outputs have a linear relationship with speed during walking. During running, uniaxial accelerometer outputs plateau because of the biomechanics of running, whereas triaxial accelerometer output has a linear relationship. The combined methodologies predict VO2 better than either predictor alone; a subject's individually calibrated data further improves VO2 estimation.