Effect of explosive resistance training on titin and myosin heavy chain isoforms in trained subjects |
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Authors: | McGuigan Michael R Sharman Matthew J Newton Robert U Davie Alan J Murphy Aron J McBride Jeffrey M |
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Institution: | Musculoskeletal Research Center, Department of Exercise and Sport Science, University of Wisconsin- La Crosse, La Crosse, Wisconsin 54601, USA. mcguigan.mich@uwlax.edu |
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Abstract: | The purpose of this investigation was to evaluate changes in myosin heavy chain (MyHC) and titin isoforms after using various loads during explosive jump squat training. Twenty-four male athletic subjects were recruited for this study. Two experimental groups performed 8-weeks of jump squats using either 30% (n = 9) or 80% (n = 9) of their previously determined 1 repetition maximum. A third group served as controls (n = 6). Muscle biopsies were obtained before and after 8 weeks from vastus lateralis. The analysis of titin within these subjects confirmed that human skeletal muscle contains 2 isoforms of titin. There was no significant group x time interaction for MyHC or titin isoform expression. The data from this investigation indicates that a relatively short period of explosive resistance training results in negligible changes in the expression of MyHC or titin isoforms. |
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