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Erschienen in: European Journal of Applied Physiology 11-12/2016

10.09.2016 | Original Article

The effect of exercise hypertrophy and disuse atrophy on muscle contractile properties: a mechanomyographic analysis

verfasst von: Christian Than, Danijel Tosovic, Laura Seidl, J. Mark Brown

Erschienen in: European Journal of Applied Physiology | Ausgabe 11-12/2016

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Abstract

Purpose

To determine whether mechanomyographic (MMG) determined contractile properties of the biceps brachii change during exercise-induced hypertrophy and subsequent disuse atrophy.

Methods

Healthy subjects (mean ± SD, 23.7 ± 2.6 years, BMI 21.8 ± 2.4, n = 19) performed unilateral biceps curls (9 sets × 12 repetitions, 5 sessions per week) for 8 weeks (hypertrophic phase) before ceasing exercise (atrophic phase) for the following 8 weeks (non-dominant limb; treatment, dominant limb; control). MMG measures of muscle contractile properties (contraction time; T c, maximum displacement; D max, contraction velocity; V c), electromyographic (EMG) measures of muscle fatigue (median power frequency; MPF), strength measures (maximum voluntary contraction; MVC) and measures of muscle thickness (ultrasound) were obtained.

Results

Two-way repeated measures ANOVA showed significant differences (P < 0.05) between treatment and control limbs. During the hypertrophic phase treatment MVC initially declined (weeks 1–3), due to fatigue (decline in MPF), followed by improvement against control during weeks 6–8. Between weeks 5 and 8 treatment, muscle thickness was greater than control, reflecting gross hypertrophy. MMG variables Dmax (weeks 2, 7) and Vc (weeks 7, 8) declined. During the atrophic phase, MVC (weeks 9–12) and muscle thickness (weeks 9, 10) initially remained high before declining to control levels, reflecting gross atrophy. MMG variables D max (weeks 9, 14) and V c (weeks 9, 14, 15) also declined during the atrophic phase. No change in T c was found throughout the hypertrophic or atrophic phases.

Conclusions

MMG detects changes in contractile properties during stages of exercise-induced hypertrophy and disuse atrophy suggesting its applicability as a clinical tool in musculoskeletal rehabilitation.
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Metadaten
Titel
The effect of exercise hypertrophy and disuse atrophy on muscle contractile properties: a mechanomyographic analysis
verfasst von
Christian Than
Danijel Tosovic
Laura Seidl
J. Mark Brown
Publikationsdatum
10.09.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Applied Physiology / Ausgabe 11-12/2016
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-016-3469-9

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