Article

The study investigates the effects of eccentric exercise of the quadriceps on
proprioception of the knee in weight and non-weight bearing tasks. Proprioception
of the exercised leg was assessed at 120 degrees and 150 degrees of knee
extension in 15 healthy adults (age 25.0 +/- 3.6 yrs) before, immediately after,
and 24h following eccentric exercise of the quadriceps. Three tests of
proprioception were performed: 1. matching the position of the exercised leg
(right leg) to the reference leg (left leg) in sitting (non-weight bearing
matching task); 2. repositioning the exercised leg after active movement in
sitting (non-weight bearing repositioning task); 3. repositioning the exercised
leg after active movement in standing (weight bearing task). Maximum knee
extension force was reduced by 77.0 +/- 12.3 % immediately after the exercise,
and by 82.7 +/- 16.2% 24h post exercise, with respect to baseline (P<0.001). The
absolute error in the non-weight bearing matching task at 120 degrees of knee
extension was greater immediately following eccentric exercise (12.3 +/- 5.6,
P<0.001) and 24h after exercise (8.1 +/- 4.5, P<0.05) compared to baseline (5.8
+/- 2.7). Similarly, the absolute error in the non-weight bearing repositioning
task at 120 degrees was greater both immediately (5.9 +/- 3.1 degrees , P<0.01)
and 24h post exercise (5.2 +/- 3.0 degrees , P<0.05) compared to baseline (4.5
+/- 2.6 degrees ). Therefore, in both non-weight bearing tasks, the subjects
matched the position of their leg after eccentric exercise by adopting a more
extended knee position of the exercised limb. Furthermore, the subjects showed
higher variability in their performance immediately post exercise (P<0.05,
compared to baseline) but not 24h after. In contrast, eccentric exercise did not
affect the repositioning errors in the weight bearing task. In conclusion,
eccentric exercise of the quadriceps impairs proprioception of the knee both
immediately after and 24h post exercise, but only in non-weight bearing tasks.
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Langue : ANGLAIS