著者

渡邊 航平

出版者

日本基礎理学療法学会

雑誌

日本基礎理学療法学雑誌 (ISSN:21860742)

巻号頁・発行日

vol.19, no.2, pp.2-7, 2016-08-03 (Released:2018-09-28)

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Anatomical studies reported that human rectus femoris (RF) muscle is comprised of two different muscle-tendon units or neuromuscular compartments. Based on these anatomical characteristics, it can be assumed that the two regions within the RF muscle are controlled via different strategies by the central nervous system and play different functional roles. We are applying multi-channel surface electromyography technique to investigate regionspecific neuromuscular activation within the RF muscle. First, our study demonstrated that the proximal regions selectively activate during hip flexion while whole regions activate during knee extension (Watanabe et al. J Electromyogr Kinesiol 2012, Muscle Nerve 2014). This region-specific functional role was found during walking (Watanabe et al. J Biomech 2014) and pedaling (Watanabe et al. Muscle Nerve 2015). We also reported that regional neuromuscular regulation during walking is influenced by aging (Watanabe et al. J Biomech 2016). These studies suggest that regional neuromuscular regulation plays key role in human movements. Moreover, we showed that proximal regions are more fatigable than other regions (Watanabe et al. Muscle Nerve 2013). This may be explained by the potential of non-uniform arrangements of different types of motor units or muscle fibers along the muscle which was tested by electrical nerve stimulation (Watanabe et al. Eur J Appl Physiol 2014). From these studies, we concluded that the RF muscle is regulated by different strategies during human movements.

著者

髙石 鉄雄 對馬 明 児玉 泰 西井 匠 小林 培男 渡邊 航平 秋間 広

出版者

一般社団法人日本体力医学会

雑誌

体力科学 (ISSN:0039906X)

巻号頁・発行日

vol.62, no.4, pp.331-341, 2013-08-01 (Released:2013-08-29)

参考文献数

53

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This study evaluated the exercise profile (heart rate, cycling speed and pedal cadence) during 25-30 km cycling and fitness and health level for adults (11 males: 69.6 ± 4.7 yrs; 6 females: 66.3 ± 4.9 yrs) with a recreational cycling habit (27.6 ± 14.8 km/week). Exercise intensity at a constant speed on a flat road during male and female cycling was 71.2 ± 11.5 and 66.8 ± 11.4% heart rate reserved (HRR), respectively. Exercise intensity over 60% HRR occupied 72% of cycling time. Peak intensity during male and female cycling was 89.2 ± 8.9 and 93.1 ± 6.1% HRR, respectively. VO2max and CS (chair stand)-30 test for male and female were 40.3 ± 4.3 and 37.7 ± 2.4 ml/kg/min, and 30.8 ± 3.1 and 30.1 ± 3.2 times, respectively. The muscle cross-sectional area of thigh extensor and flexor measured by MRI were 55.4 ± 6.5 and 58.3 ± 13.3 cm2 for male, and 45.5 ± 6.4 and 50.2 ± 5.7 cm2 for female, respectively. Blood profile for HDL-C (cholesterol), LDL-C and HbA1c (JDS) for male and female were 65.9 ± 8.2 and 67.9 ± 10.6 mg/dl, 112.3 ± 32.0 and 130.6 ± 12.3 mg/dl, and 4.8 ± 0.4 and 4.7 ± 0.1%, respectively. Fitness level and blood profile results were superior to those of the same aged adults. We concluded that the exercise intensity of cycling by middle and older adults with a recreational cycling habit is high and their fitness and health level are higher than average adults.