Akutni vpliv dveh ravnotežnih nalog različnih zahtevnosti na vzdražnost sklada alfa motonevronov

slovenian

2018

volume 66, issue 1/2

Univerza v Ljubljani, Fakulteta za šport

The purpose of this study was to determine differences between two different difficulties of balance task (BT) and their acute influence on H-wave. The research included 13 voluntary participants. Each of them performed BT of two different difficulties in random order. BT was performed on balance board with motion in sagittal plane. We measured acute changes of spinal mechanisms with recording soleus H-reflex, active time of establishing balance control, number of hand supports because of losing balance, distance and speed of balance board. After each repetition of BT, we elicited H-reflex. Active time of establishing balance, number of hand supports because of losing balance and speed of balance board are statistically different between tasks (all: p<0,05). We noted that more difficult BT reduces amplitude of wave H in less series, while after 7 repetitions there is no differences in H-wave reduction between tasks. Mechanical parameters were correlated with reduction of H-wave amplitude, but only in less difficult BT. This could mean that there can be a threshold level to which H-reflex amplitude can potentially present a measure of BT difficulty. We also noticed that number of repetitions influences on gradual reduction of H-wave amplitude in both BT.

21.12.2021