PMID- 33467235 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20210122 IS - 2411-5142 (Electronic) IS - 2411-5142 (Linking) VI - 5 IP - 1 DP - 2020 Mar 8 TI - Intermittent Energy Restriction Attenuates the Loss of Fat Free Mass in Resistance Trained Individuals. A Randomized Controlled Trial. LID - 10.3390/jfmk5010019 [doi] LID - 19 AB - There is a lack of research into how lean, resistance trained (RT) individuals respond to intermittent energy restricted diets. Therefore, we investigated body composition changes in RT-individuals during continuous energy restriction or intermittent restriction. A total of 27 males and females (25 +/- 6.1 years; 169 +/- 9.4 cm; 80 +/- 15.6 kg) were randomized to a ~25% caloric restricted diet Refeed (RF; n = 13) or Continuous group (CN; n = 14) in conjunction with 4-days/week resistance training for 7-weeks. RF implemented two consecutive days of elevated carbohydrate (CHO) intake, followed by 5-days of caloric restriction each week. CN adhered to a continuous 7-week caloric restriction. Body mass (BM), fat mass (FM), fat-free mass (FFM), dry fat-free mass (dFFM), and resting metabolic rate (RMR) were assessed pre/post-diet. Both groups significantly reduced BM (RF: baseline = 76.4 +/- 15.6 kg, post-diet = 73.2 +/- 13.8 kg, Delta3.2 kg; CN: baseline = 83.1 +/- 15.4 kg, post-diet = 79.5 +/- 15 kg, Delta3.6 kg) and FM (RF: baseline = 16.3 +/- 4 kg, post-diet = 13.5 +/- 3.6 kg, Delta2.8 kg; CN: baseline = 16.7 +/- 4.5 kg, post-diet = 14.4 +/- 4.9 kg, Delta2.3 kg) with no differences between groups. FFM (RF: baseline = 60.1 +/- 13.8 kg, post-diet = 59.7 +/- 13.0 kg, 0.4 kg; CN: baseline = 66.4 +/- 15.2 kg, post-diet = 65.1 +/- 15.2 kg, Delta1.3 kg p = 0.006), dFFM (RF: baseline = 18.7 +/- 5.0 kg, post-diet = 18.5 +/- 4.5 kg, Delta0.2 kg; CN: baseline =21.9 +/- 5.7 kg, post-diet = 20.0 +/- 5.7 kg, Delta1.9 kg), and RMR (RF: baseline = 1703 +/- 294, post-diet = 1665 +/- 270, Delta38 kcals; CN: baseline = 1867 +/- 342, post-diet = 1789 +/- 409, Delta78 kcals) were better maintained in the RF group. A 2-day carbohydrate refeed preserves FFM, dryFFM, and RMR during energy restriction compared to continuous energy restriction in RT-individuals. FAU - Campbell, Bill I AU - Campbell BI AUID- ORCID: 0000-0002-4106-3871 AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Aguilar, Danielle AU - Aguilar D AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Colenso-Semple, Lauren M AU - Colenso-Semple LM AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Hartke, Kevin AU - Hartke K AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Fleming, Abby R AU - Fleming AR AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Fox, Carl D AU - Fox CD AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Longstrom, Jaymes M AU - Longstrom JM AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Rogers, Gavin E AU - Rogers GE AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Mathas, David B AU - Mathas DB AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Wong, Vickie AU - Wong V AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Ford, Sarah AU - Ford S AUID- ORCID: 0000-0001-6916-8782 AD - Exercise Science Program, University of South Florida, Performance and Physique Enhancement Laboratory, Tampa, FL 33620, USA. FAU - Gorman, John AU - Gorman J AD - Team Gorman LLC, Republic, MO 65738, USA. LA - eng GR - 01/undefined undefined/ PT - Journal Article DEP - 20200308 PL - Switzerland TA - J Funct Morphol Kinesiol JT - Journal of functional morphology and kinesiology JID - 101712257 PMC - PMC7739314 OTO - NOTNLM OT - bodybuilding OT - diet OT - diet break OT - fat loss OT - nutrition OT - physique enhancement OT - refeed OT - resistance training OT - sports nutrition OT - weight loss COIS- B.I.C. serves on the scientific advisory board for Dymatize Athletic Nutrition Institute. Dymatize Athletic Nutrition Institute had no role in the design, data collection, interpretation of the data or in the writing/editing of the manuscript, or in the decision to publish the results. EDAT- 2021/01/21 06:00 MHDA- 2021/01/21 06:01 PMCR- 2020/03/08 CRDT- 2021/01/20 01:08 PHST- 2020/02/06 00:00 [received] PHST- 2020/03/03 00:00 [revised] PHST- 2020/03/05 00:00 [accepted] PHST- 2021/01/20 01:08 [entrez] PHST- 2021/01/21 06:00 [pubmed] PHST- 2021/01/21 06:01 [medline] PHST- 2020/03/08 00:00 [pmc-release] AID - jfmk5010019 [pii] AID - jfmk-05-00019 [pii] AID - 10.3390/jfmk5010019 [doi] PST - epublish SO - J Funct Morphol Kinesiol. 2020 Mar 8;5(1):19. doi: 10.3390/jfmk5010019.