The Effect of Pedaling Cadence on Skeletal Muscle Oxygenation During Cycling at Moderate Exercise Intensity
The Effect of Pedaling Cadence on Skeletal Muscle Oxygenation During Cycling at Moderate Exercise Intensity
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DOI：
10.1055/a-0835-6286
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发表时间：
2019-05-01
影响因子：
2.5
通讯作者：
Ishida, Koji
中科院分区：
文献类型：
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作者：
Formenti, Federico;Dockerill, Cameron;Ishida, Koji
本研究的目的是评估在等于呼吸阈值(T(Vent))的运动强度下骑车时骨骼肌氧合的节奏增加所确定的变化。9名健康、活跃的个体在等于T(Vent)的功率输出下进行自行车运动，以40、50、60、70、80和90rpm的速度踏板，每次4min。节奏测试是在随机的平衡序列中进行的。心肺和代谢反应的研究使用心电图仪测量心率，气体热量仪测量肺摄氧量和二氧化碳产生。用近红外光谱测定组织饱和指数(TSI)，这是一项衡量股外侧肌氧合能力的指标。从安静到运动，TSI降低的幅度在90rpm(-14+/-4%)时明显大于40(-12+/-3%)和50(-12+/-3%)rpm时(P分别为0.027和0.017)。尽管幅度很小，但本研究记录到的节奏增加时TSI的显著下降表明，当运动强度接近T(Vent)时，高节奏对骨骼肌氧合的影响相对更大。
The aim of this study was to assess the changes determined by increased cadence on skeletal muscle oxygenation during cycling at an exercise intensity equal to the ventilatory threshold (T (vent) ).Nine healthy, active individuals with different levels of cycling experience exercised at a power output equal to T (vent) , pedaling at cadences of 40, 50, 60, 70, 80 and 90rpm, each for 4min. Cadences were tested in a randomized counterbalanced sequence. Cardiopulmonary and metabolic responses were studied using an ECG for heart rate, and gas calorimetry for pulmonary oxygen uptake and carbon dioxide production. NIRS was used to determine the tissue saturation index (TSI), a measure of vastus lateralis oxygenation.TSI decreased from rest to exercise; the magnitude of this TSI reduction was significantly greater when pedaling at 90rpm (-14 +/- 4%), compared to pedaling at 40 (-12 +/- 3%) and 50 (-12 +/- 3%) rpm (P=0.027 and 0.017, respectively). Albeit small, the significant decrease in TSI at increased cadence recorded in this study suggests that skeletal muscle oxygenation is relatively more affected by high cadence when exercise intensity is close to T (vent) .