The Effects of Intermittent Diet Breaks during 25% Energy Restriction on Body Composition and Resting Metabolic Rate in Resistance-Trained Females: A Randomized Controlled Trial.

Autor:	Siedler MR; Exercise Science Program, University of South Florida, Tampa, FL, USA.; Kinesiology and Sport Management, Texas Tech University, Lubbock, TX, USA., Lewis MH; Exercise Science Program, University of South Florida, Tampa, FL, USA.; Health and Kinesiology, Texas A&M University, College Station, TX, USA., Trexler ET; Exercise Science Program, University of South Florida, Tampa, FL, USA., Lamadrid P; Exercise Science Program, University of South Florida, Tampa, FL, USA., Waddell BJ; Exercise Science Program, University of South Florida, Tampa, FL, USA., Bishop SF; Exercise Science Program, University of South Florida, Tampa, FL, USA., SanFilippo G; Exercise Science Program, University of South Florida, Tampa, FL, USA., Callahan K; Exercise Science Program, University of South Florida, Tampa, FL, USA., Mathas D; Exercise Science Program, University of South Florida, Tampa, FL, USA., Mastrofini GF; Exercise Science Program, University of South Florida, Tampa, FL, USA.; Exercise Science, University of South Carolina, Columbia, SC, USA., Henselmans M; The International Scientific Research Foundation for Fitness and Nutrition, Amsterdam, The Netherlands., Vårvik FT; The International Scientific Research Foundation for Fitness and Nutrition, Amsterdam, The Netherlands.; Sport Science and Physical Education, Faculty of Health and Sport Sciences, University of Agder, Kristiansand, Norway., Campbell BI; Exercise Science Program, University of South Florida, Tampa, FL, USA.
Jazyk:	angličtina
Zdroj:	Journal of human kinetics [J Hum Kinet] 2023 Jan 20; Vol. 86, pp. 117-132. Date of Electronic Publication: 2023 Jan 20 (Print Publication: 2023).
DOI:	10.5114/jhk/159960
Abstrakt:	The purpose of this study was to examine the effects of intermittent versus continuous energy restriction on body composition, resting metabolic rate, and eating behaviors in resistance-trained females. Thirty-eight resistance-trained females (mean ± standard deviation age: 22.3 ± 4.2 years) were randomized to receive either six weeks of a continuous 25% reduction in energy intake (n = 18), or one week of energy balance after every two weeks of 25% energy restriction (eight weeks total; n = 20). Participants were instructed to ingest 1.8 g protein/kilogram bodyweight per day and completed three weekly supervised resistance training sessions throughout the intervention. There were no differences between groups for changes over time in body composition, resting metabolic rate, or seven of the eight measured eating behavior variables (p > 0.05). However, a significant group-by-time interaction for disinhibition (p < 0.01) from the Three-Factor Eating Questionnaire was observed, with values (± standard error) in the continuous group increasing from 4.91 ± 0.73 to 6.17 ± 0.71, while values in the intermittent group decreased from 6.80 ± 0.68 to 6.05 ± 0.68. Thus, diet breaks do not appear to induce improvements in body composition or metabolic rate in comparison with continuous energy restriction over six weeks of dieting, but may be employed for those who desire a short-term break from an energy-restricted diet without fear of fat regain. While diet breaks may reduce the impact of prolonged energy restriction on measures of disinhibition, they also require a longer time period that may be less appealing for some individuals. Competing Interests: The authors declare no relevant financial conflicts of interest. B.I.C. was a member of the scientific advisory board for Dymatize Athletic Nutrition Institute at the time of the study's design and execution, but not at the time of submission of the manuscript for publication. E.T.T. earns income as a writer, practitioner, and consultant within the fitness industry. (Copyright: © Academy of Physical Education in Katowice.)
Databáze:	MEDLINE
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