Year : 2016  |  Volume : 1  |  Issue : 2  |  Page : 71-78

Isometric muscle strength as a predictor of one repetition maximum in healthy adult females: a crossover trial

Department of Physiotherapy, Faculty of Medicine and Health Sciences (FMHS), Universiti Tunku Abdul Rahman, Kajang, Malaysia

Correspondence Address:
Manisha Parai
Department of Physiotherapy, Faculty of Medicine and Health Sciences (FMHS), Universiti Tunku Abdul Rahman, Kajang
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2468-5674.183005

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One repetition maximum (1RM) and maximum voluntary contraction (MVC) with a digital dynamometer are popular methods of measuring muscle strength. The types of muscle contraction involved in both are different, 1RM involves isotonic muscle contraction (ITMC) and MVC with a digital dynamometer involves isometric muscle contraction (IMMC). There are several risks involved in measurement of 1RM, such as delayed onset muscle soreness and being unsafe for pathological joints, all of these can be reduced if we use IMMC in measuring muscular strength. Both cannot be equated as they are different types of contraction, therefore the purpose of this study was to compare and find a relationship between 1RM measurement and isometric MVC in healthy females. Twenty-nine young females (mean age = 20.77 ± 1.28 years) without any weight training experience (mean body mass index = 20.43 ± 1.85) volunteered to participate in the study. It was a crossover trial where 48 hours of rest period was given between each measurement technique. Results showed moderate correlations (r = 0.365-0.847) between 1RM and MVC. A simple linear regression analysis revealed a significant estimated regression equation for dominant and non-dominant sides [dominant, Y = 0.391X + 1.472; non-dominant, Y = 0.251X + 2.629 (Y: 1RM, X: Isometric)] with low standard error of estimate (dominant, 0.74; non-dominant, 0.80). Results also showed no significant difference between these derived equations and Brzycki 1RM prediction equation. Both prediction equations can be used interchangeably to predict the muscle strength of a healthy female, and thus IMMC can be used to predict 1RM in healthy females.

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