TY - JOUR
T1 - Effect of unaccustomed eccentric exercise on proprioception of the knee in weight and non-weight bearing tasks
AU - Vila-Chã, Carolina
AU - Riis, Simone
AU - Lund, Ditte
AU - Møller, Anders
AU - Farina, Dario
AU - Falla, Deborah
N1 - Copyright © 2010 Elsevier Ltd. All rights reserved.
PY - 2011/2
Y1 - 2011/2
N2 - 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° and 150° 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° 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° was greater both immediately (5.9 ± 3.1°, P<0.01) and 24h post exercise (5.2 ± 3.0°, P<0.05) compared to baseline (4.5 ± 2.6°). 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.
AB - 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° and 150° 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° 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° was greater both immediately (5.9 ± 3.1°, P<0.01) and 24h post exercise (5.2 ± 3.0°, P<0.05) compared to baseline (4.5 ± 2.6°). 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.
KW - Adult
KW - Exercise
KW - Female
KW - Humans
KW - Knee Joint
KW - Male
KW - Muscle Contraction
KW - Posture
KW - Proprioception
KW - Range of Motion, Articular
KW - Weight-Bearing
KW - Journal Article
KW - Research Support, Non-U.S. Gov't
U2 - 10.1016/j.jelekin.2010.10.001
DO - 10.1016/j.jelekin.2010.10.001
M3 - Article
C2 - 21044850
SN - 1050-6411
VL - 21
SP - 141
EP - 147
JO - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
IS - 1
ER -