Department of Nutrition and Movement Sciences, School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, The Netherlands; Rehabilitation Research Center, REVAL, Faculty of Rehabilitation Sciences, Hasselt University, Belgium; School of Care and Public Health Research Institute, Maastricht University Medical Centre, The Netherlands.
Department of Nutrition and Movement Sciences, School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, The Netherlands.
Gait Posture. 2022 Feb;92:2-7. doi: 10.1016/j.gaitpost.2021.11.005. Epub 2021 Nov 10.
Treadmill assessments are often performed at a fixed speed. Feedback-controlled algorithms allow users to adjust the treadmill speed, hereby potentially better resembling natural self-paced locomotion. However, it is currently unknown whether the energetics and biomechanics of self-paced differ from fixed-paced treadmill walking. Such information is important for clinicians and researchers using self-paced locomotion for assessing gait.
To investigate whether energy cost and biomechanics are different between self-paced and matched-speed fixed-paced locomotion.
18 healthy participants (9 males/9 females, mean ± standard deviation age 24.8 ± 3.3 years, height 1.71 ± 0.81 m, weight 65.9 ± 8.1 kg) walked at four different self-paced speeds (comfortable, slow, very slow, fast) in randomized order on an instrumented treadmill while three-dimensional motion capture and gas exchange were measured continuously. The average walking speed during the last 2 min of the self-paced trials was used to match the speed in fixed-paced conditions. Linear mixed models were used to assess differences in mean values and within-subject variations between conditions (self-paced and fixed-paced) and speeds. Statistical Parametric Mapping was used to assess differences in kinematics of the lower limb between conditions.
Although self-paced walking consistently resulted in a 4-6% higher net cost of walking, there were no significant differences in the net cost of walking between conditions. Further, there were also no differences of clinical relevance in spatiotemporal outcomes and sagittal-plane lower-limb kinematics between the self-paced and fixed-paced conditions. Within-trial variability was also not significantly different between conditions.
Self-paced and fixed-paced treadmill walking yield similar energetics and kinematics in healthy young individuals when mean values or linear measures of variation are of interest.
跑步机评估通常在固定速度下进行。反馈控制算法允许用户调整跑步机速度，从而更好地模拟自然的自主步态。然而，目前尚不清楚自主步态的能量学和生物力学是否与固定速度的跑步机行走不同。对于使用自主步态评估步态的临床医生和研究人员来说，这些信息非常重要。
研究自主和匹配速度的固定速度跑步机行走之间的能量消耗和生物力学是否不同。
18 名健康参与者（9 名男性/9 名女性，平均年龄 ± 标准差为 24.8 ± 3.3 岁，身高 1.71 ± 0.81 米，体重 65.9 ± 8.1 公斤）以随机顺序在仪器化跑步机上以四种不同的自主速度（舒适、慢、非常慢、快）行走，同时连续测量三维运动捕捉和气体交换。自主试验的最后 2 分钟内的平均行走速度用于匹配固定速度条件下的速度。线性混合模型用于评估条件（自主和固定速度）和速度之间的平均值和个体内变化的差异。统计参数映射用于评估下肢运动学的差异。
尽管自主行走始终导致行走的净成本增加 4-6%，但条件之间的净行走成本没有显著差异。此外，自主和固定速度跑步机行走在时空结果和矢状面下肢运动学方面也没有差异具有临床意义。试验内变异性在条件之间也没有显著差异。
当关注平均值或线性变化测量时，健康年轻人的自主和固定速度跑步机行走在能量学和运动学方面具有相似的结果。
