UNLABELLED: The effects of increased dietary protein on resistance training (RT)-induced changes in body composition and skeletal muscle fiber size are uncertain in older people. OBJECTIVES: We hypothesized that the ingestion of more animal-based foods, especially eggs, to achieve a higher protein intake would enhance RT-induced changes in body composition. SETTING: West Lafayette, IN. PARTICIPANTS: 36 older people (age 61 +/- 1 y; mean +/- SEM). INTERVENTION: Subjects completed RT three d/wk for 12 weeks, and consumed omnivorous diets that contained either 0.9 +/- 0.1 (lower protein) or 1.2 +/- 0.0 (higher protein) g protein x kg(-1) x d(-1) (12 +/- 3 and 17 +/- 5% of energy intakes, respectively), with the higher protein intake achieved by consuming more eggs, meats, and dairy foods. The lower and higher protein diets contained 213 +/- 21 and 610 +/- 105 mg cholesterol/d, respectively. MEASUREMENTS: Strength, body composition, serum lipid-lipoprotein profile, urinary creatinine, skeletal muscle fiber type and size. RESULTS: Among all subjects, over time (i.e. with RT) body weight was unchanged, lean mass (1.1 +/- 0.2 kg) increased, and fat mass (-1.4 +/- 0.2 kg) decreased (all changes P < 0.05). Regional (i.e. trunk, legs, arms) lean mass increased and fat mass decreased. Whole body muscle mass (24-h urinary creatinine excretion) increased, but skeletal muscle (vastus lateralis) type 1, type 2a, and type 2x fiber cross-sectional areas did not change from baseline. Serum total and LDL cholesterol decreased (P < 0.05) and HDL cholesterol and triacylglycerol were unchanged. Dietary protein and cholesterol intakes did not influence these responses to RT. CONCLUSION: Consumption of diets that contained moderately higher protein and variable amounts of cholesterol did not differentially affect body composition, skeletal muscle fiber size, or serum lipid-lipoprotein profile responses to resistance training in older people.
RCT Entities:
UNLABELLED: The effects of increased dietary protein on resistance training (RT)-induced changes in body composition and skeletal muscle fiber size are uncertain in older people. OBJECTIVES: We hypothesized that the ingestion of more animal-based foods, especially eggs, to achieve a higher protein intake would enhance RT-induced changes in body composition. SETTING: West Lafayette, IN. PARTICIPANTS: 36 older people (age 61 +/- 1 y; mean +/- SEM). INTERVENTION: Subjects completed RT three d/wk for 12 weeks, and consumed omnivorous diets that contained either 0.9 +/- 0.1 (lower protein) or 1.2 +/- 0.0 (higher protein) g protein x kg(-1) x d(-1) (12 +/- 3 and 17 +/- 5% of energy intakes, respectively), with the higher protein intake achieved by consuming more eggs, meats, and dairy foods. The lower and higher protein diets contained 213 +/- 21 and 610 +/- 105 mg cholesterol/d, respectively. MEASUREMENTS: Strength, body composition, serum lipid-lipoprotein profile, urinary creatinine, skeletal muscle fiber type and size. RESULTS: Among all subjects, over time (i.e. with RT) body weight was unchanged, lean mass (1.1 +/- 0.2 kg) increased, and fat mass (-1.4 +/- 0.2 kg) decreased (all changes P < 0.05). Regional (i.e. trunk, legs, arms) lean mass increased and fat mass decreased. Whole body muscle mass (24-h urinary creatinine excretion) increased, but skeletal muscle (vastus lateralis) type 1, type 2a, and type 2x fiber cross-sectional areas did not change from baseline. Serum total and LDL cholesterol decreased (P < 0.05) and HDL cholesterol and triacylglycerol were unchanged. Dietary protein and cholesterol intakes did not influence these responses to RT. CONCLUSION: Consumption of diets that contained moderately higher protein and variable amounts of cholesterol did not differentially affect body composition, skeletal muscle fiber size, or serum lipid-lipoprotein profile responses to resistance training in older people.
Authors: D G Burke; P D Chilibeck; K S Davidson; D G Candow; J Farthing; T Smith-Palmer Journal: Int J Sport Nutr Exerc Metab Date: 2001-09 Impact factor: 4.599
Authors: Darren G Candow; Philip D Chilibeck; Marina Facci; Saman Abeysekara; Gordon A Zello Journal: Eur J Appl Physiol Date: 2006-06-10 Impact factor: 3.078
Authors: Miriam Y Cortez-Cooper; Allison E DeVan; Maria M Anton; Roger P Farrar; Kimberly A Beckwith; Janice S Todd; Hirofumi Tanaka Journal: Am J Hypertens Date: 2005-07 Impact factor: 2.689
Authors: J P McCarthy; M M Bamman; J M Yelle; A D LeBlanc; R M Rowe; M C Greenisen; S M Lee; E R Spector; S M Fortney Journal: Eur J Appl Physiol Occup Physiol Date: 1997
Authors: Wayne W Campbell; Todd A Trappe; Alison C Jozsi; Laura J Kruskall; Robert R Wolfe; William J Evans Journal: J Physiol Date: 2002-07-15 Impact factor: 5.182
Authors: Shalender Bhasin; Caroline M Apovian; Thomas G Travison; Karol Pencina; Lynn L Moore; Grace Huang; Wayne W Campbell; Zhuoying Li; Andrew S Howland; Ruo Chen; Philip E Knapp; Martha R Singer; Mitali Shah; Kristina Secinaro; Richard V Eder; Kathleen Hally; Haley Schram; Richelle Bearup; Yusnie M Beleva; Ashley C McCarthy; Erin Woodbury; Jennifer McKinnon; Geeta Fleck; Thomas W Storer; Shehzad Basaria Journal: JAMA Intern Med Date: 2018-04-01 Impact factor: 21.873
Authors: Wayne W Campbell; Jung Eun Kim; Akua F Amankwaah; Susannah L Gordon; Eileen M Weinheimer-Haus Journal: J Nutr Date: 2015-08-05 Impact factor: 4.798
Authors: Christopher Brooks Mobley; Carlton D Fox; Brian S Ferguson; Corrie A Pascoe; James C Healy; Jeremy S McAdam; Christopher M Lockwood; Michael D Roberts Journal: J Int Soc Sports Nutr Date: 2015-03-13 Impact factor: 5.150