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Brazilian Journal of Physical Therapy

Print version ISSN 1413-3555

Abstract

BRUNIERA, Carlos A. V.; ROGERIO, Fernando R. P. G.  and  RODACKI, Andre L. F.. Stabilometric response during single-leg stance after lower limb muscle fatigue. Braz. J. Phys. Ther. [online]. 2013, vol.17, n.5, pp.464-469. ISSN 1413-3555.  http://dx.doi.org/10.1590/S1413-35552012005000119.

OBJECTIVE:

This study sought to analyze the effect of muscle fatigue induced by active isotonic resistance training at a moderate intensity by measuring the knee extension motion during the stabilometric response in a single-leg stance among healthy university students who perform resistance training on a regular basis.

METHOD:

Eleven healthy university students were subjected to a one-repetition maximum (1RM) test. In addition, stabilometric assessment was performed before and after the intervention and consisted of a muscle fatiguing protocol, in which knee extension was selected as the fatiguing task. The Shapiro-Wilk test was used to investigate the normality of the data, and the Wilcoxon test was used to compare the stabilometric parameters before and after induction of muscle fatigue, at a significance level of p≤0.05. Descriptive statistics were used in the analysis of the volunteers' age, height, body mass, and body mass index (BMI).

RESULTS:

The sample population was 23.1±2.7 years of age, averaged 1.79.2±0.07 m in height and 75.6±8.0 Kg in weight, and had a BMI of 23.27±3.71 Kg.m-2. The volunteers performed exercises 3.36±1.12 days/week and achieved a load of 124.54±22.07 Kg on 1RM and 74.72±13.24 Kg on 60% 1RM. The center of pressure (CoP) oscillation on the mediolateral plane before and after fatigue induction was 2.89±0.89 mm and 4.09±0.59 mm, respectively, while the corresponding values on the anteroposterior plane were 2.5±2.2 mm and 4.09±2.26 mm, respectively. The CoP oscillation amplitude on the anteroposterior and mediolateral planes exhibited a significant difference before and after fatigue induction (p=0.04 and p=0.05, respectively).

CONCLUSIONS:

The present study showed that muscle fatigue affects postural control, particularly with the mediolateral and anteroposterior CoP excursion.

Keywords : rehabilitation; muscle fatigue; exercise; postural balance.

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