Isoinertial and Isokinetic Sprints: Muscle Signalling.
| Autor: | Fuentes, T., Ponce-González, J. G., Morales-Alamo, D., De Torres-Peralta, R., Santana, A., De Pablos-Velasco, P., Olmedillas, H., Guadalupe-Grau, A., Rodríguez-García, L., Serrano-Sanchez, J. A., Guerra, B., Calbet, J. A. L. |
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| Předmět: |
MUSCLE physiology
ANALYSIS of variance BIOPSY BLOOD sugar BODY composition CELLULAR signal transduction CLINICAL trials ENZYME-linked immunosorbent assay INSULIN ISOKINETIC exercise RESEARCH funding RUNNING STATISTICS T-test (Statistics) WESTERN immunoblotting DATA analysis REPEATED measures design DATA analysis software DESCRIPTIVE statistics |
| Zdroj: | International Journal of Sports Medicine; Apr2013, Vol. 34 Issue 4, p285-292, 8p, 3 Diagrams, 2 Charts |
| Abstrakt: | To determine if the muscle signalling response to a 30 s all-out sprint exercise is modulated by the exercise mode and the endocrine response, 27 healthy volunteers were divided in 2 groups that performed isokinetic (10 men and 5 women) and isoinertial (7 men and 5 women) Wingate tests. Blood samples and vastus lateralis muscle biopsies were taken before, immediately after, 30 and 120 min after the sprints. Groups were comparable in age, height, body weight, percentage of body fat, peak power per kg of lower extremities lean mass (Pmax) and muscle fi bre types. However, the isoinertial group achieved a 25 % greater mean power (Pmean). Sprint exercise elicited marked increases in the musculus vastus lateralis AMPK?, ACC?, STAT3, STAT5 and ERK1/2 phosphorylation (all P < 0.05). The AMPK?, STAT3, and ERK1/2 phosphorylation responses were more marked after the isoinertial than isokinetic test (interaction: P < 0.01). The diff erences in muscle signalling could not be accounted for by diff erences in Pmax, although Pmean could explain part of the diff erence in AMPK? phosphorylation. The leptin, insulin, glucose, GH, IL-6, and lactate response were similar in both groups. In conclusion, the muscle signalling response to sprint exercise diff ers between isoinertial and isokinetic sprints. [ABSTRACT FROM AUTHOR] |
| Databáze: | Complementary Index |
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