Protein Intake During an Exercise and Weight Loss Program Affects Success

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Retrospective Analysis Of Weight Loss Relative To Protein Intake During Short-term Exercise Training In Women: 

Earnest, Conrad P. FACSM; Lockard, Brittanie; Baetge, Claire; Greenwood, Mike; Kreider, Richard B. FACSM

American College of Sports Medicine Annual Meeting, June 2, 2917
Medicine & Science in Sports & Exercise: May 2017 – Volume 49 – Issue 5S – p 987
PURPOSE: To retrospectively examine the effects of circuit weight training (10-wk) in 663 sedentary, overweight/obese women (age 46±y, BMI 34.85 ± 6.17 kg/m2) on weight loss, anthropometry and indices of cardiovascular health relative to PRO ingestion.

METHODS: Eight exercise-training studies performed from 2002–2014 were examined relative to tertiles of PRO ingestion (Low, <0.8 g/kg/d; Moderate; >0.8-1.2 g/kg/d; High >1.2 g/kg/d). The Primary outcome is clinically significant weight loss (CSWL, 5%). Secondary outcomes include anthropometry and measures of cardiovascular health. Data were analyzed using GLM adjusted for age, study and respective baseline values. Chi-square and adjusted residual analyses were used to determine categorical differences.

RESULTS: Protein ingestion was: Low (n=278; 0.65 g/kg/d ± 0.12; range 0.24-0.80), Moderate (n=225; 0.98 g/kg/d ± 0.12; range 0.891-1.19) and High (142 (n=142; 1.66 g/kg/d ± 0.42; range 1.20-3.28). Weight change was: Gained weight (12%; 1.01 kg, 95% CI, 0.24, 1.78), exhibited non-CSWL (50%; -1.81 kg, 95% CI, -2.04, -1.59) and achieved CSWL (39%; -7.17 kg (95% CI, -7.42, -6.92). Post-hoc assessment showed that High PRO consumers did not gain a significant amount of weight (0.70 kg, 95% CI, -0.42, 1.81), while Low (0.97 kg, 95% CI, 0.30, 1.64) and Moderate PRO consumers did (1.36 kg, 95% CI, 0.84, 1.89). No other significant differences were observed for weight loss or lean body mass relative to PRO tertiles. Interestingly, 57% of those consuming higher PRO (1.66 ± 0.42 g/kg/d) achieved CSWL vs. ~33% in low (0.65 g/kg/d) and moderate PRO 0.98 g/kg/d ± 0.12) consumers (P-for-trend, 0.001). Further comparison demonstrated that Low PRO consumers were significantly unlikely to achieve CSWL (adjres= -3.1), while those ingesting High PRO were significantly more likely to achieve CSWL (adjres = 4.9).

CONCLUSION: Despite the lack of difference for magnitude of weight loss between PRO groups, high PRO consumers were significantly more likely to achieve CSWL during a short exercise intervention consisting of resistance and aerobic training. Equally, higher PRO consumption may offset the magnitude of weight gain vs. lower PRO intakes if weight loss is not achieved.

Sponsor. Curves International