Naslov
Plyometric exercise improves jumping performance and skeletal muscle contractile properties in seniors.

Autori
Damir Zubac, Armin Paravlić, Katja Koren, Felicita Urzi, Bostjan Šimunič.

Izvornik
JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS (1108-7161) 19 (2019), 1; 38-49

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, ostalo

Ključne riječi
Aging, Elderly, Countermovement Jump, Contractile Properties

Sažetak
OBJECTIVE: This study investigated the effects of an 8- week plyometric training (PT) session on countermovement jump (CMJ) height, take-off velocity, and Tensiomyography (TMG) derived contractile parameters in seniors. METHODS: Twenty-three senior adults (age 66.7±5.2 years) were randomly divided into two groups: PLYO (n=11) and CTRL (n=12). Tensiomyography was measured in vastus lateralis (VL), biceps femoris (BF), tibialis anterior (TA), gastrocnemius medialis (GM), and lateralis (GL). Additionally, the electromechanical efficiency (EME) index was calculated in GM as a ratio between amplitudes of peak-to-peak M- wave and TMG (Dm) responses. Biochemical markers of muscle damage and inflammation were evaluated to provide indirect indices of exercise protocol safety. RESULTS: The main effect of time (for take-off velocity p=.023 ; ɳ2= .236) and group x time interactions (for CMJ, Tc (BF, GM), Dm (BF) and EME p<.05 ; ɳ2= .136 - .236) were observed. Post hoc analysis showed a significant increase in CMJ height and take-off velocity, namely by 14.2% (p=.001) and 8.2% (p=.01) in PLYO, respectively. Contraction time (Tc) decreased in BF -5.7% (p=.001) and GM -9.6% (p=.001). Dm decreased only in BF -20.8% (p=.001), while the EME index of the GM improved by 22.9% (p=.002). There were no differences between groups or assessment time points for C-reactive protein (p=.122). CONCLUSION: The present study clearly supports the application of supervised PT exercise in seniors, since explosive power, muscle contractility, and EME of the lower limbs were markedly improved after training.

Izvorni jezik
Engleski

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