京都大学 · 医学
Hirono教授の研究室では、運動生理学的アプローチを通じて、筋肉の肥大・機能変化とその調節要因を解明しています。特に、抵抗運動による筋肥大のメカニズム、筋肉の急性な腫脹反応、および時間的要因（日中の変動、短期間の体重変化）が筋機能に与える影響に注力しています。非侵襲的刺激法（rPMS）を用いた筋肉反応の評価や、高負荷・低負荷のセット間休息時間の違いが筋肉に与える急性効果についても、超音波を用いた精密な測定を実施しています。
Figures are computed from collected data and may differ slightly.
Hirono, T, Ikezoe, T, Taniguchi, M, Tanaka, H, Saeki, J, Yagi, M, Umehara, J, and Ichihashi, N. Relationship between muscle swelling and hypertrophy induced by resistance training. J Strength Cond Res 36(2): 359-364, 2022-Muscle swelling immediately after resistance exercise may be induced by metabolic stress. The accumulation of metabolic stress is considered to promote muscle hypertrophy after several weeks of resistance training (RT). The purpose of this study was to determine the relationshi
Age-related decline in circular gait speed was observed in older women aged ≥75 years, but not in older men. Maximal straight-line gait speed decreased significantly in both genders after the age of 70 years. Geriatr Gerontol Int 2021; 21: 404-410.
Intrinsic factors related to neuromuscular function are time-of-day dependent, but diurnal rhythms in neural and muscular components of the human neuromuscular system remain unclear. The present study aimed to investigate the time-of-day effects on neural excitability and muscle contractile properties by assessing the firing properties of tracked motor units and electrically evoked twitch muscle contraction. In 15 young adults (22.9 ± 4.7 yr), neuromuscular function was measured in the morning (
It is important to understand the effects of rapid changes in weight on neuromuscular functions of combat athletes. The purpose of this case study was to investigate time-course changes in muscle strength, muscle size, and neural input during rapid weight loss in a professional boxer. One professional male boxer (26 yr) participated in two matches during measurements: welterweight (66.6 kg; weight loss: WL) and super welterweight (69.85 kg; control: CON). His muscle contraction properties and bo
The effects of high-load resistance training on muscle strength and muscle mass depend on rest periods between sets. However, whether differences in rest period length during low-load resistance exercise (RE) has an influence on improving muscle characteristics remains unclear. Better understanding such effects would enable us to prescribe low-load resistance exercise more safely and effectivity. The purpose of this study was to investigate the acute effects of low-load RE on muscle swelling wit
Repetitive peripheral magnetic stimulation (rPMS) is a non-invasive stimulator that can induce strong muscle contraction in selective regions. This study aimed to measure acute changes in skeletal muscle thickness induced by rPMS following a low-intensity exercise. Fifteen healthy young men performed an isometric knee extensor exercise at 30% of maximum strength consisting of three sets of 10 contractions on their dominant leg. rPMS was then applied on the vastus lateralis (VL) at the maximum in
Static stretching immediately affects various neuromusculoskeletal components. Among quadriceps muscles, only the rectus femoris (RF) is stretched by hip extension and knee flexion. The aim of this study was to investigate the motor unit (MU) firing behaviors of two synergistic muscles after selective static stretching on only one side. Fourteen males (23.7 ± 2.4 years) performed knee extension tasks before and after the intervention: static stretching or control conditions. The static stretchin
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