Department of Sports Medicine for Health Promotion, Tokyo Medical University, Tokyo 160-8402, Japan.
Adv Exp Med Biol. 2010;662:359-64. doi: 10.1007/978-1-4419-1241-1_52.
This study investigated heterogeneity of muscle O(2) consumption (diffusive m-VO(2)) and muscle oxygenation difference (m-O(2) difference) within the forearm flexor muscles using multi-optical fibers near-infrared continuous wave spectroscopy (NIRcws) during incremental exercise. Nine healthy male subjects performed incremental dynamic handgrip exercise until exhaustion. The workload was increased by 5% maximal voluntary contraction (MVC) every 1 min, starting at 10% MVC. The NIRcws probes (10 channels) were placed on the right forearm flexor muscles to monitor muscle oxygenation. The diffusive m-VO(2) and the m-O(2) difference were evaluated at each exercise stage. The diffusive m-VO(2) at the medial site was significantly greater than the lateral site at 25% MVC (p < 0.05). Similarly, m-O(2) difference at the medial site increased significantly over the lateral site (p < 0.05), whereas there were no significant differences in diffusive m-VO(2) or m-O(2) difference between the proximal and distal sites. These results in forearm muscle were different from the previous study which found that there were longitudinal differences in muscle VO(2) in the femoral muscle.
本研究使用多光纤近红外连续波光谱（NIRcws）技术，在递增性运动过程中，研究了前臂屈肌内肌肉耗氧量（弥散 m-VO2）和肌肉氧差（m-O2 差）的异质性。9 名健康男性受试者进行递增性动态手握力运动，直至力竭。负荷从 10%最大自主收缩（MVC）开始，每 1 分钟增加 5%最大自主收缩（MVC）。NIRcws 探头（10 个通道）放置在前臂屈肌的右侧，以监测肌肉氧合情况。在每个运动阶段评估弥散 m-VO2 和 m-O2 差。在 25%MVC 时，内侧部位的弥散 m-VO2 明显大于外侧部位（p<0.05）。同样，内侧部位的 m-O2 差明显高于外侧部位（p<0.05），而近端和远端部位的弥散 m-VO2 或 m-O2 差没有显著差异。这些在前臂肌肉中的结果与先前在股肌中发现的肌肉 VO2 存在纵向差异的研究结果不同。
