Influence of aging on isometric muscle strength, fat-free mass and electromyographic signal power of the upper and lower limbs in women
Document title: Influence of aging on isometric muscle strength, fat-free mass and electromyographic signal power of the upper and lower limbs in women
Journal: Brazilian journal of physical therapy
Database: PERIÓDICA
System number: 000380175
ISSN: 1809-9246
Authors: 1
2
3
3
1
4
Institutions: 1Universidade Federal de Juiz de Fora, Faculdade de Terapia Fisica, Juiz de Fora, Minas Gerais. Brasil
2Universidade Federal do Rio de Janeiro, Rio de Janeiro. Brasil
3Universidade Federal de Vicosa, Departamento de Educacao Fisica, Vicosa, Minas Gerais. Brasil
4Universidade Federal de Sao Carlos, Departamento de Educacao Fisica, Sao Carlos, Sao Paulo. Brasil
Year:
Season: Mar-Abr
Volumen: 18
Number: 2
Pages: 183-190
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental
English abstract Aging is a multifactorial process that leads to changes in the quantity and quality of skeletal muscle and contributes to decreased levels of muscle strength. Objective: This study sought to investigate whether the isometric muscle strength, fat-free mass (FFM) and power of the electromyographic (EMG) signal of the upper and lower limbs of women are similarly affected by aging. Method: The sample consisted of 63 women, who were subdivided into three groups (young (YO) n=33, 24.7±3.5 years; middle age (MA) n=15, 58.6±4.2 years; and older adults (OA). n=15, 72.0±4.2 years). Isometric strength was recorded simultaneously with the capture of the electrical activity of the flexor muscles of the fingers and the vastus lateralis during handgrip and knee extension tests, respectively. FFM was assessed using dual-energy X-ray absorptiometry. Results: The handgrip strength measurements were similar among groups (p=0.523), whereas the FFM of the upper limbs was lower in group OA compared to group YO (p=0.108). The RMSn values of the hand flexors were similar among groups (p=0.754). However, the strength of the knee extensors, the FFM of the lower limbs and the RMSn values of the vastus lateralis were lower in groups MA (p=0.014, p=0.006 and p=0.013, respectively) and OA (p=0.000, p=0.000 and p<0.000, respectively) compared to group YO. Conclusions: The results of this study demonstrate that changes in isometric muscle strength in MLG and electromyographic activity of the lower limbs are more pronounced with the aging process of the upper limb
Disciplines: Medicina
Keyword: Fisiología humana,
Geriatría,
Envejecimiento,
Fuerza muscular,
Electromiografía,
Extremidades superiores,
Extremidades inferiores
Keyword: Medicine,
Geriatrics,
Human physiology,
Aging,
Muscle strength,
Electromyography,
Upper limbs,
Lower limbs
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