Enhanced physiological tremor deteriorates plantar flexor torque steadiness after bed rest.
J Electromyogr Kinesiol
; 21(2): 384-93, 2011 Apr.
Article
en En
| MEDLINE
| ID: mdl-21131213
This study evaluated the effectiveness of resistance training to preserve submaximal plantar flexor (PF) torque steadiness following 60 days of bed rest (BR). Twenty-two healthy male subjects underwent either BR only (CTR, n=8), or BR plus resistance training (RT, n=14). The magnitude of torque fluctuations during steady submaximal isometric PF contractions (20%, 40%, 60% and 80% of maximum) were assessed before and after BR. Across contraction intensities, torque fluctuations (coefficient of variation, CV) increased more (P<0.05) after BR for CTR (from 0.31±0.10 to 0.92±0.63; P<0.001), than for RT (from 0.30±0.09 to 0.54±0.27; P<0.01). A shift in the spectral content of torque fluctuations towards increased rhythmic activity between 6.5 and 20Hz was observed in CTR only (P<0.05). H-reflex amplitude (H(max)/M(max) ratio) declined across groups from 0.57±0.18 before BR to 0.44±0.14 following BR (P<0.01) without correlation to CV. The present study showed that increased torque fluctuation after BR resulted from enhanced physiological tremor. Resistance training prevented the spectral shift in isometric PF torque fluctuation and offset â¼50% of the decline in performance associated with long-term BR.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Temblor
/
Reposo en Cama
/
Atrofia Muscular
/
Músculo Esquelético
/
Fuerza Muscular
/
Entrenamiento de Fuerza
Tipo de estudio:
Etiology_studies
Límite:
Adult
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
J Electromyogr Kinesiol
Asunto de la revista:
FISIOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Reino Unido