A carregar...
Publicação
Hamstrings passive and active shear modulus : implications of conventional static stretching and warmup
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.04 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Purpose: This study compares the acute effects of a static stretching and a warmup protocol on the active and passive shear modulus of the hamstring muscles.
Methods: Muscle shear modulus was assessed at rest and during isometric contractions at 20 % of maximal voluntary isometric contraction (MVIC).
Results: After stretching, the passive shear modulus pattern was not altered, while at 20 % MVIC the biceps femoris short head (BFsh) and semimembranosus showed a shear modulus increase and decrease, respectively, which resulted on BFsh-SM pair differences (pre: 3.8 ± 16.8 vs. post: 39.3 ± 25.1 kPa; p < 0.001; d = 1.66) which was accompanied by a decrease of 18.3 % on MVIC. Following the warmup protocol, passive shear modulus remained unchanged, while active shear modulus was decreased for the semitendinosus (pre: 65.3 ± 13.5 vs. post: 60.3 ± 12.3 kPa; p = 0.035; d = 0.4). However, this difference was within the standard error of measurement (10.54 kPa), and did not impact the force production, since it increased only 1.4 % after the warmup.
Conclusions: The results of this study suggest that the passive and active shear modulus responses of the individual hamstring muscles to static stretching are muscle-specific and that passive and active hamstring shear modulus are not changed by a standard warmup intervention.
Descrição
Palavras-chave
Musculoskeletal ultrasound Shear wave elastography Shear modulus Exercise Lower extremity
Contexto Educativo
Citação
Pimenta, R., Correia, J. P., Vaz, J. R., Veloso, A. P., & Herzog, W. (2024). Hamstrings passive and active shear modulus: Implications of conventional static stretching and warmup. Journal of science and medicine in sport, 27(6), 415–421. https://doi.org/10.1016/j.jsams.2024.02.006
Editora
Elsevier