Shirai Yuya, Ito Tadashi, Ito Yuji, Matsunaga Naomichi, Noritake Koji, Ochi Nobuhiko, Sugiura Hideshi
Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya 461-8673, Japan.
Department of Rehabilitation, Nagoya University Hospital, Nagoya 466-8560, Japan.
Healthcare (Basel). 2023 Jan 11;11(2):221. doi: 10.3390/healthcare11020221.
The response of muscle oxygen saturation, which is an index for the energy metabolism of muscles during walking in children, and its relationship to the physiological cost index, which indicates walking efficiency, are unknown. This study aimed to evaluate muscle oxygen saturation in lower extremity muscles during walking in children, its changes with age, and the relationship between the physiological cost index. The oxygen saturation was measured by the amount of change during a two-minute walk, and the physiological cost index was calculated from the change in heart rate before and after exercise and walking speed. Results were compared for each muscle, and the correlation between the two was examined. Changes in muscle oxygen saturation were greater in the lower leg muscles, significantly greater in the tibialis anterior at six to seven years, and in the gastrocnemius medial head at eight to ten years. The physiological cost index was significantly correlated with changes in muscle oxygen saturation in the tibialis anterior (r = 0.44, p < 0.001). The lower leg muscles were metabolically active in children’s gait, and their response varied with age. Moreover, the muscle oxygenation dynamics of the tibialis anterior may influence walking efficiency.
肌肉氧饱和度是儿童行走过程中肌肉能量代谢的一个指标，其与表明行走效率的生理成本指数之间的关系尚不清楚。本研究旨在评估儿童行走过程中下肢肌肉的氧饱和度、其随年龄的变化以及与生理成本指数之间的关系。通过两分钟步行期间的变化量来测量氧饱和度，并根据运动前后心率的变化和步行速度来计算生理成本指数。对每块肌肉的结果进行比较，并检查两者之间的相关性。小腿肌肉的肌肉氧饱和度变化更大，在6至7岁时胫骨前肌变化显著更大，在8至10岁时腓肠肌内侧头变化显著更大。生理成本指数与胫骨前肌的肌肉氧饱和度变化显著相关（r = 0.44，p < 0.001）。小腿肌肉在儿童步态中代谢活跃，其反应随年龄而变化。此外，胫骨前肌的肌肉氧合动力学可能会影响行走效率。
