Abstract
Objectives: This study aims to analyse the validity (agreement between two methods) of the movement propulsive velocity (MPV) as an indicator of relative load in leg press (LP) and bench press (BP) exercises in persons with multiple sclerosis (MS). Methods: 18 persons with MS (sex = 55% male; age (mean ± SD) = 44.88 ± 10.62 years; body mass = 67.19 ± 10.63 kg; height = 1.66 ± 0.07 m; Expanded Disability Status Scale (EDSS) = 3.12 ± 1.73) performed an incremental loading test in BP and LP exercises in two separate sessions. Individual determination of the one-repetition maximum (1RM) and full load-velocity profile were obtained for each participant. Results: a significant linear relationship was observed between the %1RM load and the MPV in LP (%1RM = −133.58 × MPV + 117.44; r2 = 0.84; standard error of the estimate (SEE) = 9.38%1RM) and BP (%1RM = −95.66 × MPV + 115.26; r2 = 0.86; SEE = 9.82%1RM). In addition, no significant differences were found between the %1RM achieved directly and the %1RM obtained by the equation calculated from the linear regression (LP, p = 0.996; BP, p = 0.749). Conclusions: these results indicate that movement velocity can estimate the relative load in bench press and leg press exercises in persons MS.
Highlights
Persons who have multiple sclerosis (MS), an autoimmune disorder that leads to myelin and axon loss, present a variety of symptoms, such as spastic paresis [1], impaired balance [2], and ventilatory muscle weakness [3]
The problem with the direct calculation of 1RM is related to the time and energy-consumption required for the assessment [13]; along with increments of fatigue related to the lack of muscle strength and power in MS patients [14]
A significant linear relationship was observed between the %1RM load and the movement propulsive velocity (MPV) in both exercises
Summary
Persons who have multiple sclerosis (MS), an autoimmune disorder that leads to myelin and axon loss, present a variety of symptoms, such as spastic paresis [1], impaired balance [2], and ventilatory muscle weakness [3]. Persons with MS have reduced muscle strength, which can be due to lower neuromuscular activation [4] or lower physical activity and (or) sedentarism [5] These consequences mentioned above have been shown to improve with the practice of individualised physical activity and exercise [6]. Resistance training in MS has shown improvements in muscle strength or functional capacity [7], and reduced fatigue, better mood, and quality of life [8]. The optimisation of strength training programs is one to achieve improved strength and power In this way, manipulation of strength training variables, in particular, the intensity of training loads within a periodical program is a key factor in maximising strength training gains [9,10]. The problem with the direct calculation of 1RM is related to the time and energy-consumption required for the assessment [13]; along with increments of fatigue related to the lack of muscle strength and power in MS patients [14]
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