Abstract
Introduction: Loss of lumbar extensor muscle strength and fatigue resistance may contribute to functional disability. Methods: Two groups of subjects were recruited: young (n = 26, 20-35 years of age) and old (n = 26, ≥65 years of age) adults. Lumbar extensor muscle strength was measured with a load cell, and electromyographic activities were recorded to study muscle fatigue at 60% of maximum voluntary contraction. Results: We found that the muscle moments generated by the extensor muscles decreased with age (P < 0.05). Aging was associated with a significant increase in the power of the lower frequency band (101-200 Hz) of the electromyographic signals (P < 0.05), but the spectral characteristics did not appear to change with sustained contraction (P > 0.05). Conclusions: The changes in strength and spectral properties of the electromyographic signals of lumbar extensor muscles may be related to age-related alterations in muscle fiber composition and recruitment. These changes should be considered in clinical functional task evaluation.
| Original language | English |
|---|---|
| Pages (from-to) | 74-79 |
| Number of pages | 6 |
| Journal | Muscle and Nerve |
| Volume | 44 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 2011 |
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Keywords
- Aging
- Electromyography
- Lumbar extensor muscles
- Muscle fatigue
- Muscle strength
ASJC Scopus subject areas
- Clinical Neurology
- Cellular and Molecular Neuroscience
- Physiology (medical)
- Physiology
Cite this
Strength and fatigue of lumbar extensor muscles in older adults. / Ajit Singh, Devinder Kaur; Bailey, Martin; Lee, Raymond.
In: Muscle and Nerve, Vol. 44, No. 1, 07.2011, p. 74-79.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Strength and fatigue of lumbar extensor muscles in older adults
AU - Ajit Singh, Devinder Kaur
AU - Bailey, Martin
AU - Lee, Raymond
PY - 2011/7
Y1 - 2011/7
N2 - Introduction: Loss of lumbar extensor muscle strength and fatigue resistance may contribute to functional disability. Methods: Two groups of subjects were recruited: young (n = 26, 20-35 years of age) and old (n = 26, ≥65 years of age) adults. Lumbar extensor muscle strength was measured with a load cell, and electromyographic activities were recorded to study muscle fatigue at 60% of maximum voluntary contraction. Results: We found that the muscle moments generated by the extensor muscles decreased with age (P < 0.05). Aging was associated with a significant increase in the power of the lower frequency band (101-200 Hz) of the electromyographic signals (P < 0.05), but the spectral characteristics did not appear to change with sustained contraction (P > 0.05). Conclusions: The changes in strength and spectral properties of the electromyographic signals of lumbar extensor muscles may be related to age-related alterations in muscle fiber composition and recruitment. These changes should be considered in clinical functional task evaluation.
AB - Introduction: Loss of lumbar extensor muscle strength and fatigue resistance may contribute to functional disability. Methods: Two groups of subjects were recruited: young (n = 26, 20-35 years of age) and old (n = 26, ≥65 years of age) adults. Lumbar extensor muscle strength was measured with a load cell, and electromyographic activities were recorded to study muscle fatigue at 60% of maximum voluntary contraction. Results: We found that the muscle moments generated by the extensor muscles decreased with age (P < 0.05). Aging was associated with a significant increase in the power of the lower frequency band (101-200 Hz) of the electromyographic signals (P < 0.05), but the spectral characteristics did not appear to change with sustained contraction (P > 0.05). Conclusions: The changes in strength and spectral properties of the electromyographic signals of lumbar extensor muscles may be related to age-related alterations in muscle fiber composition and recruitment. These changes should be considered in clinical functional task evaluation.
KW - Aging
KW - Electromyography
KW - Lumbar extensor muscles
KW - Muscle fatigue
KW - Muscle strength
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U2 - 10.1002/mus.21998
DO - 10.1002/mus.21998
M3 - Article
C2 - 21488056
AN - SCOPUS:79959307600
VL - 44
SP - 74
EP - 79
JO - Muscle and Nerve
JF - Muscle and Nerve
SN - 0148-639X
IS - 1
ER -