Acute and Chronic Effects of Static Stretching on Intramuscular Hamstring Stiffness

被引:1
|
作者
Russell, Alexander [1 ]
Choi, Benjamin [1 ]
Robinson, Davina [1 ]
Penailillo, Luis [2 ]
Earp, Jacob E. [1 ]
机构
[1] Univ Connecticut, Sports Optimizat & Rehabil Lab, Storrs, CT 06269 USA
[2] Univ Andres Bello, Inst Exercise & Rehabil Sci, Fac Rehabil Sci, Sch Phys Therapy, Santiago, Chile
关键词
muscle stiffness; strain; stretch; warm-up; Young's modulus; PROFESSIONAL FOOTBALL; MUSCLE INJURIES; BICEPS FEMORIS; RETURN; EPIDEMIOLOGY; PROGRAM;
D O I
10.1111/sms.14670
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Passive hamstring stiffness varies proximo-distally, resulting in inhomogeneous tissue strain during stretching that may affect localized adaptations and risk of muscle injuries. The purpose of the present study was to determine the acute and chronic effects of static stretching (SS) on intramuscular hamstring stiffness. Thirty healthy active participants had acute changes in passive biceps femoris (BF), semimembranosus (SM), and semitendinosus (ST) stiffness measured at 25% (proximal), 50% (middle), and 75% (distal) muscle length, using shear-wave elastography, immediately after SS. Participants then completed 4 weeks of either a SS intervention (n = 15) or no intervention (CON, n = 15) with stiffness measured before and after the interventions. The acute and chronic effects of SS were compared between anatomical regions and between regions on the basis of their relative stiffness pre-intervention. Acutely, SS decreased stiffness throughout the BF and SM (p <= 0.05) but not the ST (p = 0.326). However, a regional effect of stretching was observed for SM and ST with greater reduction in stiffness occurring in stiffer muscular regions (p = 0.001-0.013). Chronically, SS increased BF and ST (p < 0.05), but not SM (p = 0.422) stiffness compared with CON, but no regional effect of stretching was observed in any muscle (p = 0.361-0.833). SS resulted in contrasting acute and chronic effects, acutely decreasing stiffness in stiffer regions while chronically increasing stiffness. These results indicate that the acute effects of SS vary along the muscle's length on the basis of the relative stiffness of the muscle and that acute changes in stiffness from SS are unrelated to chronic adaptations.
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页数:10
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