Department of Sports Medicine for Health Promotion, Faculty of Medicine, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, 160-8402, Japan.
Department of Electrical and Electronic Engineering, Faculty of Engineering, Shizuoka University, Shizuoka, 432-8561, Japan.
Adv Exp Med Biol. 2013;789:157-162. doi: 10.1007/978-1-4614-7411-1_22.
We compared muscle oxygen saturation (SmO2) responses in several leg muscles and within a single muscle during ramp cycling exercise between elderly men (n = 8; age, 65 ± 3 years; ELD) and young men (n = 10; age, 23 ± 3 years; YNG). SmO2 was monitored at the distal site of the vastus lateralis (VLd), proximal site of the vastus lateralis (VLp), rectus femoris (RF), vastus medialis (VM), biceps femoris (BF), gastrocnemius lateralis (GL), gastrocnemius medialis (GM), and tibialis anterior (TA) by near-infrared spatial resolved spectroscopy. During submaximal exercise, significantly lower SmO2 at a given absolute work rate was observed in VLd, RF, BF, GL, and TA but not in VLp, VM, and GM in ELD than in YNG. In contrast, at all measurement sites, SmO2 at peak exercise was not significantly different between groups. These results indicate that the effects of aging on SmO2 responses are heterogeneous between leg muscles and also within a single muscle. The lower SmO2 in older men may have been caused by reduced muscle blood flow or altered blood flow distribution.
我们比较了老年男性（n = 8；年龄，65 ± 3 岁；ELD）和年轻男性（n = 10；年龄，23 ± 3 岁；YNG）在斜坡踏车运动中几个腿部肌肉和单个肌肉内的肌肉氧饱和度（SmO2）反应。通过近红外空间分辨光谱监测股外侧肌远端（VLd）、股外侧肌近端（VLp）、股直肌（RF）、股中间肌（VM）、股二头肌（BF）、腓肠外侧肌（GL）、腓肠内侧肌（GM）和胫骨前肌（TA）的 SmO2。在亚最大运动时，ELD 中给定绝对工作率下的 SmO2 在 VLd、RF、BF、GL 和 TA 显著低于 YNG，但在 VLp、VM 和 GM 中则没有。相比之下，在所有测量部位，峰值运动时两组之间的 SmO2 无显著差异。这些结果表明，衰老对 SmO2 反应的影响在腿部肌肉之间以及单个肌肉内是不均匀的。老年人 SmO2 较低可能是由于肌肉血流量减少或血流分布改变所致。
