Enhanced myofiber recruitment during exhaustive squatting performed as whole-body vibration exercise
The purpose of the study was to test the hypothesis that myofiber recruitment is enhanced when whole-body vibration (WBV) is added to squat training. In a randomized cross-over design, 14 recreationally active men were subjected to 2 sessions consisting of 5 sets of 10 squats with external load, per...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
April 2011
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| In: |
Journal of strength and conditioning research
Year: 2011, Jahrgang: 25, Heft: 4, Pages: 1120-1125 |
| ISSN: | 1533-4287 |
| DOI: | 10.1519/JSC.0b013e3181d09e0e |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1519/JSC.0b013e3181d09e0e Verlag, lizenzpflichtig, Volltext: https://journals.lww.com/nsca-jscr/Fulltext/2011/04000/Enhanced_Myofiber_Recruitment_During_Exhaustive.33.aspx 
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| Verfasserangaben: | Holger Eckhardt, Rainer Wollny, Helmut Müller, Peter Bärtsch, and Birgit Friedmann-Bette |
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| 520 | |a The purpose of the study was to test the hypothesis that myofiber recruitment is enhanced when whole-body vibration (WBV) is added to squat training. In a randomized cross-over design, 14 recreationally active men were subjected to 2 sessions consisting of 5 sets of 10 squats with external load, performed either on a vibration platform (whole-body vibration squatting [WBVS]) or conventionally without WBV (CON). Electromyographic (EMG) activity of the right vastus lateralis muscle was continuously recorded during WBVS and CON. The integrated EMG values were normalized to the EMG activity recorded during measurement of the maximal voluntary contraction force (MVC) on an isometric leg press at the beginning of each training session. Capillary lactate concentration was determined before and repeatedly after the squatting exercise. Overall mean normalized and integrated EMG (nIEMG) activity during WBVS (62 ± 4% MVC) was significantly (p < 0.001) higher compared with CON (47 ± 2% MVC). There was a tendency for nIEMG to increase during the 5 sets of 10 squats performed as WBVS (p = 0.089), whereas there was a significant (p < 0.001) decrease in nIEMG during CON. Whole-body vibration squatting induced a significantly (p < 0.001) larger increase in capillary lactate than CON (3.03 ± 0.32 vs. 1.60 ± 0.30 mmol·L−1, p < 0.001). The increased myoelectric activity and the enhanced exercise-induced increase in capillary lactate concentration during WBVS provide evidence for augmented recruitment of muscle tissue when WBV is added to exhaustive squatting exercise. | ||
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