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The Journal of Sports Medicine and Physical Fitness 2021 Sep 09

DOI: 10.23736/S0022-4707.21.12649-0

Copyright © 2021 EDIZIONI MINERVA MEDICA

language: English

Effects of gravitational and iso-inertial resistance trainings using rating of perceived exertion on lower limbs muscle force and power abilities and metabolic cost of walking in healthy older adults

Mirco FLOREANI 1, 2 , Enrico REJC 1, 2, 3, Simone GAMBIN 1, 2, Luca VAVASSORI 1, 2, Stefano LAZZER 1, 2

1 Department of Medicine, University of Udine, Udine, Italy; 2 School of Sport Science, University of Udine, Udine, Italy; 3 Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, KY, USA


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BACKGROUND: The purpose was to compare the effects of 8-weeks resistance training programs (Flywheel Iso-inertial, FW vs Traditional Gravity-Dependent Resistance Training, GD) performed twice a week at the same rate of perceived exertion (RPE), on muscle force and power capacities and physical performance in healthy older participants.
METHODS: Twenty-four participants were randomly assigned to either FW (male/female: 7/5, age: 67.1±3.8 yr) or GD (male/female: 6/6, age 68.3±3.0 yr) group. Knee extension maximal isometric voluntary contractions (MVC), lower limb maximal explosive power (MEP), six-minute walking distance (6MWT), timed “Up & Go” scores (TUG), metabolic cost of walking (CW) and agonist-antagonist co-contraction time (CCT) during walking were evaluated before and after training.
RESULTS: absolute MEP and MEP normalized for body mass increased only in FW than GD group (+10.8% vs +0.31%, p: 0.056, respectively; +14.8% vs +13.9%, p<0.001, respectively). Both training modalities improved MVC to a similar extent (+11.1% in FW vs +13.4% in GD, p<0.001). Analogously, 6MWT distance increased in FW and GD (+5.2 and +5.5%, p<0.041, respectively). No effects of time and training modality were observed on the other parameters.
CONCLUSIONS: The study suggests that when FW and GD are administered at the same RPE with FW performed at higher movement speed in the concentric phase, both the trainings generate similar improvements in muscle strength but only the former can promote greater muscle power enhancements than GD in healthy older adults.


KEY WORDS: Ageing; Sarcopenia; Training

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