ISSN: 1899-1955
Human Movement
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2/2017
vol. 18
 
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abstract:
Original paper

Accuracy of force repeatability in relation to its value and the subjects’ sex

Ryszard Błacha
1
,
Agnieszka D. Jastrzębska
2

1.
1 Department of Physical Activity in the Natural Environment, University School of Physical Education in Wroclaw, Wroclaw, Poland
2.
Department of Physiology and Biochemistry, University School of Physical Education in Wroclaw, Wroclaw, Poland
Online publish date: 2018/02/26
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Purpose
The purpose of the study was to determine the influence of force value and sex on force generation repeatability.

Methods
The total of 17 female and 24 male students performed 3 maximal voluntary contractions for maximal force (Fmax) calculation and 10 isometric contractions with targeted forces of 49 N, 98 N, 147 N by arms: elbow extension (EE), elbow flexion (EF) and legs: knee extensions (KE). Variation in repeatedly generated forces is expressed as a coefficient of variation.

Results
The force generation repeatability rose with the increase of triggered force in both sexes; between force target 49 N vs. 98 N and 147 N (p < 0.00) for EE and EF in females, between 49 N vs. 147 N for all measurements (p < 0.00) except the right elbow extension in males. We noticed minor sex influence on force generation repeatability for EE, EF, and KE in absolute measured values and relatively to Fmax.

Conclusions
The influence of force value and a minor influence of sex on accuracy in generated forces might suggest that the control of muscle force by the central nervous system is similar in both sexes and the sex differences in muscle force generations are rather of muscle mass and structure.

keywords:

isometric force, force repeatability, gender, elbow flexion, elbow extension, knee extension

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