Stretch-shorten cycle compared with isometric preload: contributions to enhanced muscular performance
| Autor: | Greg J. Wilson, Gertjan J. C. Ettema, Andrew D. Walshe |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Adult
Male medicine.medical_specialty Weight Lifting medicine.diagnostic_test Electromyography Physiology business.industry Movement Reproducibility of Results Isometric exercise Electrophysiology Preload Physical medicine and rehabilitation Physical Fitness Physical performance Isometric Contraction Physiology (medical) medicine Physical therapy Humans Muscle Skeletal business |
| Zdroj: | Journal of Applied Physiology. 84:97-106 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/jappl.1998.84.1.97 |
| Popis: | Walshe, Andrew D., Greg J. Wilson, and Gertjan J. C. Ettema.Stretch-shorten cycle compared with isometric preload: contributions to enhanced muscular performance. J. Appl. Physiol. 84(1): 97–106, 1998.—To isolate any difference muscular contraction history may have on concentric work output, 40 trained male subjects performed three separate isokinetic concentric squats that involved differing contraction histories: 1) a concentric-only (CO) squat, 2) a concentric squat preceded by an isometric preload (IS), and 3) a stretch-shorten cycle (SSC) squat. Over the first 300 ms of the concentric movement, work output for both the SSC and IS conditions was significantly greater (154.8 ± 39.8 and 147.9 ± 34.7 J, respectively; P < 0.001) compared with the CO squat (129.7 ± 34.4 J). In addition, work output after the SSC test over the first 300 ms was also significantly larger than that for the corresponding period after the IS protocol ( P < 0.05). There was no difference in normalized, integrated electromyogram among any of the conditions. It was concluded that concentric performance enhancement derived from a preceding stretch of the muscle-tendon complex was largely due to the attainment of a higher active muscle state before the start of the concentric movement. However, it was also hypothesized that contractile element potentiation was a significant contributor to stretch-induced muscular performance under these conditions. |
| Databáze: | OpenAIRE |
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