IF 2
Taichi Nishikawa, Ryosuke Takeda, Marino Karaki, Kaito Igawa, Kohei Watanabe
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摘要

本研究的目的是调查槲皮素的摄入是否会增加肌肉收缩能力的下降,这是由于单次不同强度的阻力运动引起的。38名老年人参加了这项研究。他们被分为三个强度组:低(LI)、中(MI)和高(HI)组。每个参与者在最大自愿收缩的40 (LI)、60 (MI)或80 (HI) %时完成两次单阻力运动。在每次治疗前,他们要么服用安慰剂,要么服用槲皮素糖苷(500毫克)。在进食前、进食后和运动后,通过高密度肌电图和神经肌肉电刺激测量运动单位行为和电诱导收缩扭矩。槲皮素摄入降低了运动单位招募阈值(p
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of quercetin ingestion on neuromuscular system following single session of resistance exercise at differing intensities in older adults.

The purpose of this study was to investigate whether quercetin ingestion increases the decline in muscle contractile capacity due to a single resistance exercise session at differing intensities. Thirty-eight older adults took part in this study. They were divided into three intensity groups: low- (LI), moderate- (MI), and high-intensity (HI) groups. Each participant completed two single resistance exercise sessions of resistance exercise at 40 (LI), 60 (MI), or 80 (HI) % of maximal voluntary contraction. Before each session, they ingested either a placebo or quercetin glycoside (500 mg). Motor unit behavior and electrically elicited contraction torque were measured by high-density electromyography and neuromuscular electrical stimulation at pre-ingestion, post-ingestion, and post-exercise. Quercetin ingestion decreased the motor unit recruitment thresholds from pre- to post-ingestion (p<0.001). The decline in electrically elicited contraction torque following exercise was greater with quercetin than placebo ingestion in LI and MI groups (low: p=0.014; moderate: p=0.025), but not in the HI group (p=0.792). The greater the decline of electrically elicited contraction torque following exercise by quercetin ingestion, the greater the decrease in the recruitment threshold of motor units with a higher threshold by quercetin ingestion in LI and MI groups (low: p=0.047, rs=0.566; moderate: p=0.011, rs=0.692), but not in the HI group (p=0.228). These results suggest that quercetin ingestion accelerates the decline in muscle contractile capacity following low- or moderate-intensity resistance exercise, possibly due to the additional recruitment of higher-threshold motor units.

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