Muscle weakness, fatigue, and torque variability: effects of age and mobility status.
Muscle Nerve
; 49(2): 209-17, 2014 Feb.
Article
en En
| MEDLINE
| ID: mdl-23674266
ABSTRACT
INTRODUCTION:
Whereas deficits in muscle function, particularly power production, develop in old age and are risk factors for mobility impairment, a complete understanding of muscle fatigue during dynamic contractions is lacking. We tested hypotheses related to torque-producing capacity, fatigue resistance, and variability of torque production during repeated maximal contractions in healthy older, mobility-impaired older, and young women.METHODS:
Knee extensor fatigue (decline in torque) was measured during 4 min of dynamic contractions. Torque variability was characterized using a novel 4-component logistic regression model.RESULTS:
Young women produced more torque at baseline and during the protocol than older women (P < 0.001). Although fatigue did not differ between groups (P = 0.53), torque variability differed by group (P = 0.022) and was greater in older impaired compared with young women (P = 0.010).CONCLUSIONS:
These results suggest that increased torque variability may combine with baseline muscle weakness to limit function, particularly in older adults with mobility impairments.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Envejecimiento
/
Fatiga Muscular
/
Debilidad Muscular
/
Torque
/
Limitación de la Movilidad
/
Contracción Muscular
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
/
Risk_factors_studies
Aspecto:
Patient_preference
Límite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
Idioma:
En
Revista:
Muscle Nerve
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos