Alterations In The Body Balance After Two Types Of High Intensity Exercises

Por: A. Moraes, , , C. A. Zamai, Ewerton Rodrigo Gassi e R. Bekendorf.

Athens 2004: Pre-olympic Congress

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Nardone et al [2,3] appears that a tredmill exercise, even if strenuous, hardly affects body equilibrium. It was also postulated that fatiguing the musculature of the ankle joint would significantly increase postural sway and decrease the limits of postural control [4] after exercise or long time resistance training [1]. Therefore, the aim this study went compare the alterations in body balance after fatiguing exercise performed on a tredmill and resistance exercise of the plantarflexor muscles.

Body balance were recorded by electronic baropodometer (Physical Support Italy) in ten young subjects (24.0  2.26 years) standing, with eyes open(EO) and eyes closed (EC) prior to and after two types of physical exercise (treadmill and platar flexion (PF)). The plantar flexion was performed for 4 sets of 20 repetitions, with 50% of body mass as additional resistance and 30 s recovery. The Bruce protocol was used to tredmill session. Seven days separated the two sessions of tests. The datas analyzed were antero posterior and lateral sway, in the bipodalic and monopodalic conditions during 10 seconds, with the dominant and no dominant leg. The statistical package Statistica, version 5.0, was used to perform a non-parametric statistics. The Wilcoxon Matched Pairs test was used to identify the significantly changes (p<0.05) with respect to percentage of alterations after each exercise session.


Discussion / Conclusions
The results indicate that postural control in quiet standing can be maintained by compensatory mechanisms activated during muscle fatigue. Though, the largest alterations were found in antero posterior axis, and significant differences among the exercises were verified for the bipodalic and no dominant leg with eyes closed conditions. The bipodalic condition (with exception of the alterations after the tredmill test in the condition of the closed eyes) also presented a larger variation than the monopodalic condition.

[1]. Bankoff, A.D.P. et al. (1992).Cong. Cien. Olimpico, v.1, n.208, p.18.
[2]. Nardone, A. et al. (1997). Electroencephalogr Clin Neurophysiol, 105, (4), 309-20
[3]. Nardone, A. et al. (1998). Arch Phys Med Rehabil, v.79, 920-4
[4]. Yaggie, j. A. & McGregor, S. J. (2002). Arch Phys Med Rehabil, v.83, 224-8

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