| Abstrakt: |
Purpose: - To study the dynamic balance of lower extremities and to measure the proprioceptive force sense (FS) in healthy, untrained man (n=15) and women (n=15), ages 30-50 years; - To check sex differences, leg differences and to study the correlation among proprioception and balance. Methodology: The anthropometric parameters were evaluated by bioimpedance analyzer. The dynamic balance was measured by the Y Balance Test --Low Quarter (YBT-LQ) with a system - Y Balance Test Kit, FMS, on the dominant and non-dominant leg (or reaching and stance leg), in anterior-(ANT), posteromedial-(PM) and posterolateral-(PL) direction. The composite score (CS) was calculated as a criterion for bilateral symmetry. The maximal isometric torque and FS protocol, were performed with isokinetic system (Biodex 4 Pro). The participants reproduced 50% of the peak torque of quadriceps femoris during the FS measurement. The assessment of FS was based on the calculation of the absolute error (AE) in percentages. All parameters and the values of AE, are presented as means ± SD. For the statistical significance of the differences between means (p<0.05), the test of Mann-Whitney, Kruskal-Wallis ANOVA test, and Dunn's post hoc test, were applied. The Pearson coefficient was used to asses correlations (p<0.05). Results: There was no significant difference between the dominant and non-dominant leg in both sexes which shows good bilateral symmetry in male and female in all directions, where the values of CS>95 %. There was a significant difference between men and women, concerning the values for the dynamic balance in PM and PL directions for dominant and non-dominant leg; for men the values were higher (p<0.05) as compared with those for women. Moderate negative correlations (r=- 0.68; p=0.005) between AE and the YTB-LQ values for ANT direction of the both legs, were obtained only in female. Conclusion: Establishing bilateral symmetry in ANT, PM and PL directions in male and female with YTB-LQ, should be considered as important attribute in assessing dynamic balance in healthy untrained. The significant differences (p<0.05) between the sexes in YTBLQ in the PM and PL directions were found, which show better levels of dynamic balance in men. The moderate negative correlations found in female, between the values of YTB-LQ in ANT direction and AE, suggest that the FS of the quadriceps muscle of the stance leg is reduced earlier in women, while in men it persists. [ABSTRACT FROM AUTHOR] |
