Knee extensor force control as a predictor of dynamic balance
DOI:
https://doi.org/10.51224/SRXIV.108Keywords:
Muscle, Force control, Balance, Dynamic balance, Variability, Steadiness, ComplexityAbstract
Previous research has demonstrated that muscle force control in various muscle of the lower limb (measured according to the magnitude of force fluctuations) explains a significant amount of variance in static balance. To determine whether muscle force control also explains significant variance in dynamic balance, Y balance test performance and knee extensor muscle force control were measured in 20 healthy participants. The Y balance test involved stance on the right leg and attempting maximal reach with the left leg in the anterior, posteromedial and posterolateral directions. Force control was assessed during isometric knee extension contractions of the right leg at 10, 20 and 40% maximal voluntary contraction (MVC) and was quantified according to the magnitude of force fluctuations, using the coefficient of variation (CV), and according to the temporal structure of force fluctuations, using approximate entropy (ApEn) and detrended fluctuation analysis α. A significant negative correlation was observed for Y balance test anterior reach and muscle force CV during contractions at 40% MVC (r = –0.44, P = 0.05) and a significant positive correlation observed for anterior reach and muscle force ApEn during contractions at 40% MVC (r = 0.53, P = 0.015). A subsequent regression model demonstrated that muscle force CV and ApEn during contractions at 40% MVC significantly explained 32.3% of variance in Y balance test anterior reach. These results are the first to indicate that a moderate amount of variance in dynamic balance can be explained by measures of isometric force control.
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References
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