Role of cocontraction in the O2 cost of walking in children with cerebral palsy.
Med Sci Sports Exerc
; 28(12): 1498-504, 1996 Dec.
Article
em En
| MEDLINE
| ID: mdl-8970144
ABSTRACT
UNLABELLED A major movement related limitation for children with spastic cerebral palsy (CP) is the compromised gait pattern, which may explain their excessive energy cost of locomotion. The aims of this study were to determine differences in the O2 cost of locomotion between children with CP (7 males, 2 females; 12.7 +/- 2.8 yr) and able-bodied controls (7 male, 1 female; 13.6 +/- 2.1 yr) and to assess the contribution that cocontraction of agonist and antagonist muscles had upon the elevated O2 cost seen in children with CP versus able-bodied controls. The treadmill submaximal walking protocol consisted of 2 x 4 min intermittent stages at 3 km.h-1 and 90% of the predetermined fastest walking speed (FWS) at 0% grade. Electromyographic data were collected during the final minute of each bout from vastus lateralis and hamstrings (thigh) and tibialis anterior and soleus (lower leg). Significant (P < 0.05) differences were noted at 3 km.h-1 for mass-relative VO2. (CP 16.6 +/- 6.5 vs control 10.2 +/- 1.2 ml.kg-1.min-1), % VO2max (CP 53.5 +/- 26.0 vs CONTROL 22.5 +/- 4.93) and heart rate (CP 143 +/- 41 vs CONTROL 91 +/- 14 beats.min-1). Thigh and lower leg muscle cocontraction accounted for 51.4% and 42.8%, respectively, of the variability in VO2 for the subjects with CP at 3 km.h-1. These results suggest that cocontraction is a major factor responsible for the higher energy cost of walking seen in children with CP.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Consumo de Oxigênio
/
Paralisia Cerebral
/
Caminhada
/
Contração Muscular
Tipo de estudo:
Health_economic_evaluation
Limite:
Adolescent
/
Child
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Med Sci Sports Exerc
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Canadá