Navegando por Palavras-chave "lean mass"

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    Association Between Lean Mass and Handgrip Strength With Bone Mineral Density in Physically Active Postmenopausal Women
    (Elsevier B.V., 2010-01-01) Marin, Rosangela Villa [UNIFESP]; Carneiro Pedrosa, Marcia Alessandra [UNIFESP]; Fernandes Moreira-Pfrimer, Linda Denise [UNIFESP]; Mahecha Matsudo, Sandra Marcela; Lazaretti-Castro, Marise [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Phys Fitness Res Ctr Sao Caetano do Sul CELAFISCS
    The present study evaluated 117 physically active postmenopausal women (67.8 +/- 7.0 yr) who performed neuromotor physical tests (strength, balance. and mobility). Body composition (lean mass [g], fat mass [g], and % fat) and bone mineral density (BMD) of lumbar spine (L1-L4), femoral neck, and total body were measured by dual-energy X-ray absorptiometry. Following the World Health Organization criteria. osteoporosis was found in at least 1 analyzed site in 33 Volunteers (28.2%): 30 (25.6%) in lumbar spine and 9 (7.7%) in femoral neck. Body weight was strongly and positively related to BMD in all sites, but the most important component of body composition was lean mass, also significantly related to all BMD sites, whereas fat mass was weakly related to the femoral neck BMD. Percent fat did not correlate with any BMD site. of all the physical tests, the hand-rip strength was most importantly related to lumbar spine, femoral neck. and total body (r = 0.49, p < 0.001, r = 0.56, p < 0.001; and r = 0.52, p < 0.001. respectively). the static body balance presented a weak but significant positive correlation only with lumbar spine. Our results suggest that strategies aiming to improve Muscle strength and lean mass must contribute to the bone health of physically active postmenopausal women.
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    Body Composition Parameters in Healthy Brazilian Women Differ From White, Black, and Hispanic American Women Reference Range
    (Elsevier B.V., 2013-07-01) Barbosa Sousa, Maria das Gracas [UNIFESP]; Pinheiro, Marcelo M. [UNIFESP]; Szejnfeld, Vera L. [UNIFESP]; Castro, Charlles H. M. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Body composition (BC) seems to vary between populations, suggesting the need for regional reference data. the objective of this study was to determine BC in Brazilian women. Five hundred healthy non-black Brazilian women aged 20 yr or older were included. Women with fractures, chronic diseases, medications affecting bone and mineral metabolism, coronary heart disease, pregnancy, silicone prosthesis, and Asians or Indians were excluded. BC by dual-energy X-ray absorptiometry (DXA) included total lean mass, appendicular lean mass, skeletal muscle index, and total body fat (BF). Reference values were made for 10-yr age groups. Lean mass decreased with age reaching the lowest values in women aged 80 yr and older. BF showed a bimodal distribution: increased with age until 50-59 yr, with a slight subsequent decrease. BF in Brazilian women did not differ from American women, except in the age groups 75-79 and 80-84 yr, where BF was lower (p < 0.05). Fat mass index was consistently higher between African and Hispanic American women (p < 0.05). Lean mass was consistently lower in Brazilian women compared with Americans in almost all age and ethnic groups (p < 0.05). BC in Brazilian women differs from American reference data. Our findings support the notion that BC varies according to ethnicity.
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    Effects of creatine supplementation on body composition and renal function in rats
    (Lippincott Williams & Wilkins, 2005-09-01) Ferreira, Larissa Gorayb [UNIFESP]; Bergamaschi, Cássia de Toledo [UNIFESP]; Lazaretti-Castro, Marise [UNIFESP]; Heilberg, Ita P. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Background: the aim of the present study was to evaluate the long-term effects of oral creatine supplementation on renal function and body composition (fat and lean mass) in an experimental model. Methods: Male Wistar rats were supplemented with creatine (2 g(.)kg(-1) of food) for 10 wk in combination with treadmill exercise, 12 m(.)min(-1), 1 h(.)d(-1) (CREAT+EX, N = 12) or not (CREAT, N = 10), and compared with exercised animals without creatine supplementation (EX, N = 7) and CONTROL animals, N = 7. Body composition and bone mineral density (BMD) were determined by dual x-ray absorptiometry and glomerular filtration rate (GFR) and renal plasma flow (RPF) were measured by inulin and paraaminohippurate clearance, respectively. Results: At the end of the study (post), CREAT+EX presented higher lean mass and lower fat mass than CREAT, EX or CONTROL (349.7 +/- 19.7 vs 313.3 +/- 1- 20.3, 311.9 +/- 30.8, 312.4 +/- 21.0 g and 5.7 +/- 2.3 vs 10.0 +/- 3.3, 9.8 +/- 1.5, 10.0 +/- 3.5%, P < 0.05, respectively). Post lean/fat mass ratio was higher than baseline only in CREAT+EX (18.9 +/- 7.2 vs 8.6 +/- 1.8,P < 0.05). Post BMD was significantly higher than baseline in all groups. GFR and RPF were lower in CREAT versus CONTROL (0.5 +/- .1 vs 1.0 +/- 0.1 and 1.5 +/- 0.2 vs 2.4 +/- 0.5 mL(.)min(-1), P < 0.05, respectively). Conclusion: Creatine supplement in combination with exercise increased the proportion of lean mass more than EX or CREAT alone. the use of creatine alone induced an important and significant reduction of both RPF and GFR.
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    The relationship between lean mass, muscle strength and physical ability in independent healthy elderly women from the community
    (Springer, 2014-05-01) Pisciottano, M. V. C. [UNIFESP]; Pinto, S. S.; Szejnfeld, V. L. [UNIFESP]; Castro, C. H. M. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Univ Cidade São Paulo
    The association between muscle mass, strength and physical performance has been established in the elderly with co-morbidities. in this study, lean and fat mass, bone mineral density, knee extension and flexion strength and physical ability tests in healthy independent elderly women were investigated. Main determinants of lean mass, strength and physical ability were determined searching for predictors of healthy aging.A total of 100 healthy women aged a parts per thousand yen 65 years considered independent and active were invited. Bone mass and body composition were assessed by DXA. the strength of the lower limb was assessed by isokinetic dynamometry, and physical ability was measured by: Timed Up and Go (TUG), Berg Balance Test (BBT) and Dynamic Gait Index (DGI).Women were on average 70.8 +/- 4.92 years old, had BMI of 27.38 +/- 5.11 kg/m2 and fat mass of 26.96 +/- 9.62 kg or 40.65 +/- 8.06%. Total lean mass and appendicular lean mass (ALM) were 35.38 +/- 4.83 kg and 15.32 +/- 2.26 kg, respectively, while relative skeletal mass index (RSMI) was 6.51 +/- 0.77 kg/m2. Age did not correlate significantly with ALM. Age and ALM were the main determinants of the strength of the lower limb (p < 0.001) while age and strength of the lower limb were significantly associated with the performance on the physical tests (p < 0.001).Age has a negative impact on the strength and the physical performance in independent healthy women without co-morbidities. Physical ability tests are positively influenced by the strength of the lower limb. These relationships suggest that muscle strength should be the parameter to be prioritized when preparing for healthy aging.