Effects of Short-Term Macronutrient Redistribution on Performance Parameters in Resistance Trained Males

Daniel A Jaffe¹*, Jennifer K Hewit¹, Jason C Sawyer², Jason M Cholewa³, Alexander J Bedard¹, Tracey D Matthews⁴, Brian A Thompson⁴ and Samuel AE Headley⁴

Received: September 07, 2018;   Published: September 20, 2018

DOI: 10.26717/BJSTR.2018.09.001760

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Abstract

The present study was designed to examine the physical performance responses associated with adoption of a one-week low carbohydrate (LC) or low fat (LF) diet in resistance trained males. Subjects (n = 10) participated in four separate testing sessions, both pre and post assessment following the LC and LF diets. Performance parameters evaluated included the vertical jump (VJ), one-repetition maximum back squat (SQ) and bench press (BP), and a repetition maximum bench press (RMBP) at 75% of the attained maximum. Prior to testing, blood was drawn via venipuncture and evaluated for Testosterone and Growth Hormone concentrations. Testosterone concentration was found to be significantly lower (p < .05) with LC when compared to LF. No significant changes in performance were noted (p >0.05) across performance of all aforementione assessments. In resistance trained males, individuals have the option of switching to either a LC or LF diet without adversely affecting acute performance. Either of these strategies can be successfully applied to a nutritional periodization scheme in accordance with the training goals of the individual.

Keywords: Low Carbohydrate Diet; Strength; Endurance

Abbreviations: RER: Respiratory Exchange Ratio; CRD: Carbohydrate Restricted Diet; VJ: Vertical Jump; 1-RM: One-Repetition Maximum; BP: Bench Press; SQ: Back Squat; RMBP: Maximum Repetition Bench Press; IRB: Institutional Review Board; ELISA: Enzyme-Linked Immunosorbent Assay; CSCS: Certified Strength and Conditioning Specialist;

Abstract | Introduction | Methods | Procedures | Statistical Analysis | Results | Discussion | Practical Applications | References |