Similar increases on muscle functions in COPD and healthy after unilateral training: A randomized controlled study
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Background: Chronic Obstructive Pulmonary Disease (COPD) characterize reduced lung functions and skeletal muscle dysfunctions. Resistance training has shown to improve muscle functions to similar degree as healthy. Previous literature has furthermore proven low exterior load to have similar effects as high exterior load in healthy. This is essential for those incapable of performing training with high exterior load. Aims: The aim of this study was to investigate the effects of 10 weeks of lower body unilateral resistance training on maximal muscle strength (1RM), muscular endurance performance (repetitions to exhaustion at 50% of 1RM) and muscle thickness (Qt) between Chronic Obstructive Pulmonary Disease patients (COPD) and healthy individuals (HEALTHY). Methods: Nine COPD and 22 HEALTHY performed 10RM and 30RM resistance training in a contralateral manner for 10 weeks, preceded by three weeks of familiarization to training protocols. 1RM and repetitions to exhaustion at 50% of 1RM was measured at baseline (-3 weeks), after familiarization (0 weeks) and after 10 weeks of training (10 weeks). Qt was measured at -3 weeks and 10 weeks with portable ultrasound. Results: After 10 weeks of training, COPD and HEALTHY exerted similar increases in 1RM strength, repetitions to exhaustion at 50% of 1RM and Qt (p = 0.33 to 0.96). Overall, there were no differences between 30RM- and 10RM-training on any of the variables. Conclusion: Ten weeks of unilateral 30RM and 10RM resistance training led to similar increases in muscle strength, endurance performance and muscle thickness in COPD and HEALTHY. This has clinical implications for preventing and treating muscle waste, where the exterior load can be individualized according to health status and simultaneously improve muscle strength and thickness to similar degree.
Masteroppgave - Norges idrettshøgskole, 2017