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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
The Journal of Sports Medicine and Physical Fitness 2016 Oct 13
Resistance training with dietary intake maintenance increases strength without altering body composition in older women
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.