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Abstract Title:

Conjugated linoleic acid combined with creatine monohydrate and whey protein supplementation during strength training.

Abstract Source:

Int J Sport Nutr Exerc Metab. 2009 Feb;19(1):79-96. PMID: 19403955

Abstract Author(s):

Stephen M Cornish, Darren G Candow, Nathan T Jantz, Philip D Chilibeck, Jonathan P Little, Scott Forbes, Saman Abeysekara, Gordon A Zello

Abstract:

PURPOSE: The authors examined the combined effects of conjugated linoleic acid (CLA), creatine (C), and whey protein (P) supplementation during strength training. METHODS: Sixty-nine participants (52 men, 17 women; M +/- SD age 22.5 +/-2.5 yr) were randomly assigned (double-blind) to 1 of 3 groups: CCP (6 g/d CLA + 9 g/d C + 36 g/d P; n = 22), CP (C + P + placebo oil; n = 25), or P (P + placebo oil; n = 22) during 5 wk of strength training (4-5 sets, 6-12 repetitions, 6 d/wk). Measurements were taken for body composition (air-displacement plethysmography), muscle thickness (ultrasound) of the flexors and extensors of the elbow and knee, 1-repetition-maximum (1-RM) strength (leg press and bench press), urinary markers of bone resorption (N-telopeptides, NTx), myofibrillar protein catabolism (3-methylhistidine; 3-MH), oxidative stress (8-isoprostanes), and kidney function (microalbumin) before and after training. RESULTS: Contrast analyses indicated that the CCP group had a greater increase in bench-press (16.2% +/- 11.3% vs. 9.7% +/- 17.0%; p<.05) and leg-press (13.1% +/- 9.9% vs. 7.7% +/-14.2%; p<.05) strength and lean-tissue mass (2.4% +/- 2.8% vs. 1.3% +/-4.1%; p<.05) than the other groups combined. All groups increased muscle thickness over time (p<.05). The relative change in 3-MH (CCP -4.7% +/- 70.2%, CP -0.4% +/- 81.4%, P 20.3% +/- 75.2%) was less in the groups receiving creatine (p<.05), with the difference for NTx also close to significance (p = .055; CCP -3.4% +/- 66.6%, CP -3.9% +/- 64.9%, P 26.0% +/- 63.8%). There were no changes in oxidative stress or kidney function. CONCLUSION: Combining C, CLA, and P was beneficial for increasing strength and lean-tissue mass during heavy resistance training.

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