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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
Matheus AMARANTE DO NASCIMENTO 1, 2, Aline M. GERAGE 1, Renata S. JANUÁRIO 3, Fábio L. PINA, Luís A. GOBBO 1, Jerry L. MAYHEW 4, Edilson S. CYRINO 1
1 Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, PR, Brazil; 2 Paraná State University, Paranavaí Campus, Paranavaí, PR, Brazil; 3 Department of Physical Education, University of Northern Parana, Londrina, Parana, Brazil; 4 Exercise Science Department, Truman State University, Kirksville, MO, USA
BACKGROUND: Evidence suggests that the aging process tends to lead to sarcopenia and osteoporosis which reduce the quality of life in older women. Resistance training (RT) is widely supported as a means of delaying or offsetting the decline in muscle strength and loss of bone mineral content in older women. The purpose of this investigation was to analyze the effects of a 12-wk RT program (3 times a week) with dietary intake maintenance on muscle strength and body composition of healthy, sedentary older women.
METHODS: Forty-four older women were randomly assigned to a RT program (n = 22, 66.3 ± 4.8 years, 60.7 ± 9.1 kg, 153.1 ± 0.90 cm, 24.9 ± 3.3 kg/m² ) or a control group (n = 22, 66.4 ± 4.0 years, 63.3 ± 7.5 kg, 155.5 ± 5.8 cm, 26.2 ± 2.6 kg/m²) performing stretching exercises during the same period. One-repetition maximum test on chest press and leg extension were used to assess muscle strength. Body composition was measured by dual energy x-ray absorptiometry to determine fat mass, fat-free mass, and bone mineral content. Dietary intake was recorded using a 3-day food records. All subjects maintained their normal diet during the investigation.
RESULTS: No significant differences were found for the body composition components within and between groups. A significant time by group interaction indicated that the RT group made greater improvements in upper and lower limb muscle strength (chest press ~12%, p = 0.0001; leg extension ~13%, p <0.0001).
CONCLUSIONS: These results suggest that RT program improves muscle strength of major muscle groups, without altering body composition in older women under dietary intake maintenance.