noninvasive monitoring of training induced muscle adaptation with -mrs: fibre type shifts correlate with metabolic changes

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ID: 187477
2013
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Abstract
Purpose. To evaluate training induced metabolic changes noninvasively with magnetic resonance spectroscopy (-MRS) for measuring muscle fibre type adaptation. Methods. Eleven volunteers underwent a 24-week training, consisting of speed-strength, endurance, and detraining (each 8 weeks). Prior to and following each training period, needle biopsies and -MRS of the resting gastrocnemius muscle were performed. Fibre type distribution was analyzed histologically and tested for correlation with the ratios of high energy phosphates ([PCr]/[], [PCr]/[βATP] and [PCr + ]/[βATP]). The correlation between the changes of the -MRS parameters during training and the resulting changes in fibre composition were also analysed. Results. We observed an increased type-II-fibre proportion after speed-strength and detraining. After endurance training the percentage of fast-twitch fibres was reduced. The progression of the [PCr]/[]-ratio was similar to that of the fast-twitch fibres during the training. We found a correlation between the type-II-fibre proportion and [PCr]/[] (, ) or [PCr]/[βATP] (, ); the correlations between its changes (delta) and the fibre-shift were significant as well (delta[PCr]/[] , delta[PCr]/[βATP] , ). Conclusion. Shifts in fibre type composition and high energy phosphate metabolite content covary in human gastrocnemius muscle. Therefore -MRS might be a feasible method for noninvasive monitoring of exercise-induced fibre type transformation.
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hoff2013biomednoninvasive Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Eike Hoff;Lars Brechtel;Patrick Strube;Paul Konstanczak;Gisela Stoltenburg-Didinger;Carsten Perka;Michael Putzier
Journal spectrochimica acta - part a: molecular and biomolecular spectroscopy
Year 2013
DOI
10.1155/2013/417901
URL
http://dx.doi.org/10.1155/2013/417901
Keywords
Medicine

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