Autor(es):
Vila-Chã, Carolina 
; Riis, Simone ; Lund, Ditte ; Møller, Anders ; Farina, Dario ; Falla, Deborah
Data: 2011
Identificador Persistente: http://hdl.handle.net/10198/6977
Origem: Biblioteca Digital do IPB
Assunto(s): Exercício excêntrico; Propriocepção; Electromiografia
Descrição
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 24 h 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% 24 h 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 24 h 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 24 h 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 24 h 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 24 h post exercise, but only in non-weight bearing tasks.
