Repeated sit-to-stand exercise enhances muscle strength and reduces lower body muscular demands in physically frail elders.
Exp Gerontol
; 116: 86-92, 2019 02.
Article
em En
| MEDLINE
| ID: mdl-30593854
ABSTRACT
PURPOSE:
To examine the effect of a conditioning program consisting of repeated sit-to-stand exercise on knee extensor strength and muscular activities during body mass-based squat movement in physically frail elders.METHODS:
Fourteen men and women aged 75 to 88â¯years who used the long-term care insurance system participated in the 12-week training program (48â¯reps/session, 3â¯sessions/week). Isometric knee extension torque (KET) during a maximum voluntary contraction (MVC) and electromyogram (EMG) activities of the rectus femoris and vastus lateralis muscles during the MVC and a body mass-based squat task were determined at baseline, and following 4 and 12â¯weeks training. KET was expressed relative to body mass (KET/BM) and EMG activities during the squat task were normalized to that during a MVC and averaged (QF %EMGmax).RESULTS:
KET/BM increased from 1.07⯱â¯0.28â¯Nm/kg at baseline to 1.26⯱â¯0.26â¯Nm/kg at week 4 and 1.31⯱â¯0.28â¯Nm/kg at week 12 (Pâ¯<â¯0.001), and QF %EMGmax decreased from 67.2⯱â¯17.2% to 49.3% at week 4 (Pâ¯<â¯0.001) and 43.5⯱â¯7.7% at week 12 (Pâ¯=â¯0.016). At each of the three measurement time points KET/BM was inversely correlated with QF %EMGmax (râ¯=â¯-0.78 to -0.86, Pâ¯≤â¯0.001).CONCLUSION:
For physically frail elders, a short-term conditioning program consisting of repeated sit-to-stand exercise is effective in increasing knee extensor strength and reducing the muscular effort required for lowering and raising the body.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Músculo Quadríceps
/
Força Muscular
/
Condicionamento Físico Humano
Limite:
Aged
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Aged80
/
Female
/
Humans
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Male
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article