engleski

The influence of the physiological load on postural control- Is there a balance threshold?

Introduction The postural control is an essential factor in prevention of falls and consequently prevention of injuries and an important ability for success in many sports. The aim of the study was to evaluate the influence of the physiological load on postural co ntrol. Special attention was directed towards the identifying the intensity level in which the major deterioration in static and dynamic balan ce abilities occurs. Methods Thirty subjects were randomly divided into two groups. We conducted multistage all-out exertion protocol of spiroergometric testing on cycle-ergometer until exhaustion with continuous measurement of objective ventilatory-etabolic as well as subjective parameters of fatigue. The each level of the protocol lasted for three minutes and was followed with three minute breaks during which the subjects underwent the static and the dynamic balance testing. In a control gr oup, the protocol encompassed only balance testing procedures followed by 3 minute rest periods. After the completion of the testing procedures, the five intensity zones were determined according to the ventilatory-metabolic parameters at different loads. Results The significant differences in both static and dynamic balance tests were found in experimental, exercising, grou p between the test stages. The post-hoc analyses revealed the significant negative effect of fatigue on the static balance with three visible „balance thresholds“. The first threshold was at the rest to work transition, the second at the anaerobic threshold and the third at the maximal exertion level. The dynamic balance was also negatively affected with fatigue, however no „balance thresholds„ were clearly identified. No significant changes in neither static nor dynamic balance abilities were observed in the control group so the changes in the experimental group could have been attributed to the fatigue. Discussion As already at the intensity 60-65% of HRmax the significant decrease of balance ability was found, that is the intensity level at which the patients in rehabilitation process should train their proprioceptive/balance. However, as in athletes the demands of the sport are usually higher and considering that the next decrease in balance was identified just above the anaerobic threshold, we could advise that in order to obtain the most of their balance training the athletes should aim to train intensity zones above the anaerobic threshold.

posture ; balance ; exercise ; anaerobic threshold

nije evidentirano