Conjugated Linoleic Acid Combined With Creatine Monohydrate and Whey Protein Supplementation During Strength Training

• Autores: Stephen M. Cornish, Darren G. Candow, Nathan T. Jantz, Philip D. Chilibeck, Jonathan P. Little, Scott C. Forbes, Saman Abeysekara, Gordon A. Zello
• Localización: International journal of sport nutrition and exercise metabolism, ISSN 1526-484X, ISSN-e 1543-2742, Vol. 19, Nº. 1, 2009, págs. 79-96
• Idioma: inglés
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• Dialnet Métricas: 1 Cita
• Resumen

  • 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.