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Content available remote Flexibility: components, proprioceptive mechanisms and methods
A literature review on physical flexibility was presented and discussed. This included definitions and components that influence the performance of movements requiring large joint motion ranges and muscle elasticity. Flexibility was discussed with reference to specific age groups, e.g. children and the elderly. Proprioceptive mechanisms and components directly related to flexibility were overviewed, as well as suitable approaches towards flexibilisation, i.e. maintaining and/or enhancing flexibility.
Study aim: To assess the acute effect of the proprioceptive neuromuscular facilitation method (PNF) on the explosive strength of lower extremities of male soldiers.Material and methods: A group of 26 male soldiers performed two exercise sessions on different days, in a random order: without stretching (control exercise) or by applying PNF (experimental exercise). Before and after the PNF (0, 10, 20, 40 and 60 min), 3 vertical counter-movement jumps on a tensometric platform were executed.Results: CMJ results in the experimental sessions were significantly (p<0.001) decreased after the PNF exertion in relation to the initial (pre-session) value. No significant post-session decreases were found in the control exercise. However, the differences between the experimental and control results were significant (p<0.05) only immediately after the PNF exertion and 10 min later.Conclusion: The PNF method negatively affects the vertical jump performance and, thus, ought not to be used as part of warm-ups.
Content available remote Acute effects of static stretching on muscle strength
Study aim: To assess the effects of static passive maximal stretching on muscle performance in order to clarify the existing controversies.Material and methods: Two randomly selected groups of the Brazilian Air Force personnel were studied: experimental (n = 15), subjected to 3 bouts of static passive stretching exercises of wrist flexors and extensors (beyond a mild discomfort). Every bout lasted 10 s and was followed by a 30-s rest. The control group (n = 15) performed no exercises. Muscle strength was measured with a handgrip dynamometer before and 20 min after the test.Results: Subjects from the experimental group had the pre-exercise handgrip strength significantly higher than postexercise (by about 7%; p<0.01). No significant decrease was noted in the control group.Conclusions: Static passive stretching induces decreases in muscle strength.
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