Abstract
Unilateral and conditioned Achilles tendon-tap reflex (ATR) characteristics were examined
in a group of skilled dancers and a group of sedentary, untrained subjects (n = 7/group).
For the conditioned reflex, the right ATR was conditioned by a tap to the left Achilles
tendon using intervals of 10, 40, 70, 100, 130, 160 and 190 ms. Peak isometric force,
contraction time and half-relaxation time were examined on each trial. The results
indicated that the trained dancers exhibited less unilateral isometric force and longer
half-relaxation times (p < 0.05) than the untrained subjects. Moreover, the contralateral
conditioning stimulus caused a more marked short-latency facilitation as well as a
long-latency inhibition in the reflex force characteristics for the trained dancers
when compared with the untrained subjects. These differences in both simple and conditioned
reflexes in individuals trained for dance activities may reflect differences in muscle
stiffness, tissue compliance or neural organization.
Key words
Stretch reflex - exercise - training - spinal reflexes - muscle spindle - human
