Suga Tadashi, Terada Masafumi, Tomoo Keigo, Miyake Yuto, Tanaka Takahiro, Ueno Hiromasa, Nagano Akinori, Isaka Tadao
Faculty of Sport and Health Science, Ritsumeikan University, 1-1-1 Nojihigashi, 525-8577, Kusatsu, Shiga, Japan.
Graduate School of Health and Sport Science, Nippon Sport Science University, Fukasawa, Setagaya-ku, Tokyo, Japan.
BMC Sports Sci Med Rehabil. 2021 Jan 29;13(1):8. doi: 10.1186/s13102-021-00233-z.
Although joint flexibility is important for human locomotion, the determinants of joint flexibility are not fully understood. In this study, we examined the relationship between dorsiflexion flexibility and plantar flexor muscle size in healthy young males.
The dorsiflexion flexibility was assessed using range of motion (ROM) and stiffness during active and passive dorsiflexion. Active ROM was defined as the maximal angle during voluntary dorsiflexion. Passive ROM was defined as the angle at the onset of pain during passive dorsiflexion. Passive stiffness was calculated as the slope of the linear portion of the torque-angle curve between 10º and 20º dorsiflexion of the ankle during passive dorsiflexion. In the first study, the plantar flexor muscle volume (MV) in 92 subjects was estimated on the basis of the lower leg length and plantar flexor muscle thickness, as measured using ultrasonography. The estimated plantar flexor MV correlated significantly with active ROM (r = -0.433), passive ROM (r = -0.299), and passive stiffness (r = 0.541) during dorsiflexion (P = 0.01 for all). In the second study, the plantar flexor MV in 38 subjects was measured using magnetic resonance imaging. The plantar flexor MV correlated significantly with plantar flexor active ROM (r = -0.484), passive ROM (r = -0.383), and passive stiffness (r = 0.592) during dorsiflexion (P = 0.05 for all).
These findings suggest that a larger plantar flexor MV is related to less dorsiflexion flexibility in healthy young males.
尽管关节灵活性对人类运动很重要，但关节灵活性的决定因素尚未完全明确。在本研究中，我们探讨了健康年轻男性背屈灵活性与跖屈肌大小之间的关系。
使用主动和被动背屈过程中的活动范围（ROM）和刚度来评估背屈灵活性。主动ROM定义为主动背屈时的最大角度。被动ROM定义为被动背屈时疼痛开始时的角度。被动刚度计算为被动背屈时踝关节在10°至20°背屈之间扭矩 - 角度曲线线性部分的斜率。在第一项研究中，根据小腿长度和使用超声测量的跖屈肌厚度，估算了92名受试者的跖屈肌体积（MV）。估算的跖屈肌MV与背屈过程中的主动ROM（r = -0.433）、被动ROM（r = -0.299）和被动刚度（r = 0.541）显著相关（P均 = 0.01）。在第二项研究中，使用磁共振成像测量了38名受试者的跖屈肌MV。跖屈肌MV与背屈过程中的跖屈肌主动ROM（r = -0.484）、被动ROM（r = -0.383）和被动刚度（r = 0.592）显著相关（P均 = 0.05）。
这些发现表明，在健康年轻男性中，较大的跖屈肌MV与较小的背屈灵活性相关。
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