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Effects of fitness and vibration training on muscle quality: a 1-year postintervention follow-up in older men
Kennis E, Verschueren SM, Bogaerts A, Coudyzer W, Boonen S, Delecluse C
Archives of Physical Medicine and Rehabilitation 2013 May;94(5):910-918
clinical trial
5/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVE: To evaluate the residual effects of fitness and whole-body vibration (WBV) training in older men 1 year after completion of the interventions. DESIGN: A 1-year follow-up of a randomized controlled trial comparing the effects of 1 year of fitness training, including combined resistance and aerobic (R+A) training and WBV training, with a control (CON) group. SETTING: University training center. PARTICIPANTS: Adult men (n = 72) between 60 and 80 years of age. Response rate was 80%, 92%, and 90% in the R+A training (n = 20), WBV training (n = 23), and CON (n = 29) groups, respectively. INTERVENTIONS: The intervention groups exercised 3 times weekly during 1 year. The R+A training group performed a standard training program, combining resistance exercises and aerobic training, following the American College of Sports Medicine guidelines. The WBV training group performed unloaded static and dynamic leg exercises on a vibration platform. The CON group did not participate in any training program. MAIN OUTCOME MEASURES: Muscle volume, isometric and concentric muscle strength, muscle quality, and muscle power. RESULTS: Both interventions had resulted in comparable increases in muscle quality characteristics. No significant changes had been found in the CON group. During the 1-year follow-up period, the R+A (-4.05%, p = 0.006) and WBV (-2.45%, p < 0.0001) training groups had lost most of their gains in muscle volume. However, isometric muscle strength was preserved in the R+A training group (+1.65%, p = 0.745), resulting in an increase in muscle quality (+7.97%, p = 0.034). In the WBV training group, muscle power decreased (-6.10%, p < 0.0001) but remained significantly higher than at baseline (p = 0.038). Except for a strong decrease in muscle power, no significant changes were found in the CON group. CONCLUSIONS: One year of R+A and/or WBV training can equally reverse the adverse effects of aging on muscle quality in older men, but their residual impact after follow-up is different.

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