Bailey Daniel P, Ahmed Imran, Cooper Daniel L, Finlay Katherine A, Froome Hannah M, Nightingale Tom E, Romer Lee M, Goosey-Tolfrey Vicky L, Ferrandino Louise
Centre for Physical Activity in Health and Disease, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK.
Division of Sport, Health and Exercise Sciences, Department of Life Sciences, Brunel University London, Uxbridge, UK.
Disabil Rehabil Assist Technol. 2025 Apr;20(3):708-714. doi: 10.1080/17483107.2024.2405895. Epub 2024 Sep 20.
To evaluate the validity of a consumer-grade wearable for estimating energy expenditure, sedentary behaviour, and physical activity in manual wheelchair users with spinal cord injury (SCI).
Fifteen manual wheelchair users with SCI (C5-L1, four female) completed activities of daily living and wheelchair propulsion (2-8 km·h). Wrist-worn accelerometry data were collected using consumer-grade (z-Track) and research-grade (ActiGraph GT9X) devices. Energy expenditure was measured indirect calorimetry. Linear regression was used to evaluate the prediction of criterion metabolic equivalent of task (MET) by each accelerometer's vector magnitude (VM). Area under the receiver operating characteristic curve (ROC-AUC) evaluated the accuracy of VM for discriminating between physical activity intensities and for identifying accelerometer cut-points.
Standardised β-coefficients for the association between z-Track and ActiGraph VM for criterion MET were 0.791 ( < 0.001) and 0.774 ( < 0.001), respectively. The z-Track had excellent accuracy for classifying time in sedentary behaviour (ROC-AUC = 0.95) and moderate-to-vigorous physical activity (ROC-AUC = 0.93); similar values to the ActiGraph (ROC-AUC = 0.96 and 0.88, respectively). Cut-points for the z-Track were ≤37 g·min for sedentary behaviour and ≥222 g·min for moderate-to-vigorous physical activity.
This study supports the validity of a consumer-grade wearable to measure sedentary time and physical activity in manual wheelchair users with SCI.
评估一款消费级可穿戴设备用于估计脊髓损伤（SCI）手动轮椅使用者的能量消耗、久坐行为和身体活动的有效性。
15名SCI（C5-L1，4名女性）手动轮椅使用者完成日常生活活动和轮椅推进（2-8公里/小时）。使用消费级（z-Track）和研究级（ActiGraph GT9X）设备收集手腕佩戴的加速度计数据。通过间接量热法测量能量消耗。使用线性回归评估每个加速度计的矢量大小（VM）对标准任务代谢当量（MET）的预测。受试者工作特征曲线下面积（ROC-AUC）评估VM区分身体活动强度和识别加速度计切点的准确性。
z-Track和ActiGraph VM与标准MET之间关联的标准化β系数分别为0.791（<0.001）和0.774（<0.001）。z-Track在对久坐行为时间（ROC-AUC = 0.95）和中度至剧烈身体活动（ROC-AUC = 0.93）进行分类方面具有出色的准确性；与ActiGraph的值相似（分别为ROC-AUC = 0.96和0.88）。z-Track的切点为久坐行为≤37克·分钟，中度至剧烈身体活动≥222克·分钟。
本研究支持一款消费级可穿戴设备用于测量SCI手动轮椅使用者久坐时间和身体活动的有效性。
