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Weight loss and muscle quality in older men with metabolic syndrome
Author(s) -
Wood Richard James,
Gregory Sara,
Maneen Jonathan,
Sullivan Ryan,
Richard Jeffrey,
Sawyer Jason,
Matthews Tracey D.,
Headley Samuel A.E.
Publication year - 2011
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.25.1_supplement.982.18
Subject(s) - bioelectrical impedance analysis , medicine , endocrinology , leg press , weight loss , sarcopenia , carbohydrate , resistance training , fat mass , body weight , muscle mass , obesity , zoology , body mass index , biology
The purpose of the 12‐week study was to examine a low‐fat diet (LFD; carbohydrate:protein:fat 55:15:30) vs. a carbohydrate restricted diet (CRD; 10:25:65) with or without progressive resistance exercise (PRE) on fat‐free mass (FFM) and muscle quality in older men with metabolic syndrome. Participants were matched on BMI and randomly assigned to either: 1) LFD (n=8) 2) LFD&PRE (n=9) 3) CRD (n=8) 4) CRD&PRE (n=7). PRE groups performed three supervised strength training sessions per week. Measurements were at baseline & week 12. Body composition & weight were measured via segmental bioelectrical impedance analysis. Strength was determined by obtaining a 3–5 repetition maximum (RM) on leg press; a 1 RM was then calculated. Muscle quality = leg press 1RM/lower‐body FFM. Body weight (lbs.) decreased from baseline to week 12 ( P <0.05) with no group differences (LFD −18.0±7.4; LFD&PRE: −19.8±12.8; CRD: −20.2±8.0; CRD&PRE: −20.1±8.9). Percent weight loss as FFM was not different between groups (LFD: 38.0±20.4; LFD&PRE: 17.4±36.6; CRD: 20.3±23.4; CRD&PRE: 21.5±21). Muscle quality increased ( P <0.05) in both the LFD&PRE group (29.1±19.5%) and CRD&PRE group (24.4±16.3%), but was unchanged ( P >0.05) in the diet only groups. These data indicate that PRE is required to improve muscle quality during weight loss. Similar preservation of FFM in the CRD group to the PRE groups warrants further investigation.