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Changes in the myosin heavy chain isoform profile of the triceps brachii muscle following 12 weeks of resistance training

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Abstract

The purpose of this investigation was to determine whether 12 weeks of resistance training, which increased arm girth (5%) and forearm extensor strength (39%), also altered the myosin heavy chain (MHC) characteristics of the triceps brachii muscle. Fifteen healthy, active men volunteered to participate under experimental (n = 11) or control (n = 4) conditions. The experimental group completed four sets of eight to 12 repetitions for each exercise (i.e. triceps pushdown, close grip bench press, triceps kickbacks and biceps curl) with loads of between 70–75% of one repetition maximum (1RM) three times a week. The inter-set and inter-exercise recovery period was only 90 s. Skeletal muscle tissue was removed from the triceps brachii muscle prior to (W0) and following 4 (W4), 8 (W8) and 12 (W12) weeks of the investigation. Samples were analysed for MHC isoform content using 6% sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE). MHC isoform composition in the control group did not change significantly. However, the percentage of MHC type IIb isoform decreased significantly from W0 to W4 and again from W4 to W12 [W0: 39.7 (9.2); W12: 29.2 (8.2)%] in the experimental condition. The increments in MHC type IIa [W0: 34.0 (9.9); W12: 41.5 (10.4)] and type I [W0: 26.3 (7.9); W12: 29.3 (9.6)] isoforms were not significant for the experimental group. However, the effect size (ES) transformation of changes in types IIa MHC content was moderate (ES = 0.75). Changes in MHC isoform content were not significantly correlated with changes in 1RM strength for the triceps pushdown exercise. These data indicated that resistance training rapidly, and in an ongoing manner, changed the contractile protein profile of trained skeletal muscle. However, changes in MHC isoform composition in the first 12 weeks of training were not implicated in the development of 1RM triceps pushdown strength.

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Authors and Affiliations

  1. The Department of Human Movement Studies, The University of Queensland, 4072, Brisbane, Qld, Australia

    Jaak Jürimäe, Peter J. Abernethy, Kirsten Blake & Michael T. McEniery

  2. Institute of Sport pedagogy, Tartu University, Estonia

    Jaak Jürimäe

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  1. Jaak Jürimäe
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  2. Peter J. Abernethy
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  3. Kirsten Blake
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  4. Michael T. McEniery
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Jürimäe, J., Abernethy, P.J., Blake, K. et al. Changes in the myosin heavy chain isoform profile of the triceps brachii muscle following 12 weeks of resistance training. Europ. J. Appl. Physiol. 74, 287–292 (1996). https://doi.org/10.1007/BF00377452

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