Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2014 Nov 18;11(1):54.
doi: 10.1186/s12970-014-0054-7. eCollection 2014.

Body Composition Changes Associated With Fasted Versus Non-Fasted Aerobic Exercise

Affiliations
Free PMC article

Body Composition Changes Associated With Fasted Versus Non-Fasted Aerobic Exercise

Brad Jon Schoenfeld et al. J Int Soc Sports Nutr. .
Free PMC article

Abstract

It has been hypothesized that performing aerobic exercise after an overnight fast accelerates the loss of body fat. The purpose of this study was to investigate changes in fat mass and fat-free mass following four weeks of volume-equated fasted versus fed aerobic exercise in young women adhering to a hypocaloric diet. Twenty healthy young female volunteers were randomly assigned to 1 of 2 experimental groups: a fasted training (FASTED) group that performed exercise after an overnight fast (n = 10) or a post-prandial training (FED) group that consumed a meal prior to exercise (n = 10). Training consisted of 1 hour of steady-state aerobic exercise performed 3 days per week. Subjects were provided with customized dietary plans designed to induce a caloric deficit. Nutritional counseling was provided throughout the study period to help ensure dietary adherence and self-reported food intake was monitored on a regular basis. A meal replacement shake was provided either immediately prior to exercise for the FED group or immediately following exercise for the FASTED group, with this nutritional provision carried out under the supervision of a research assistant. Both groups showed a significant loss of weight (P = 0.0005) and fat mass (P = 0.02) from baseline, but no significant between-group differences were noted in any outcome measure. These findings indicate that body composition changes associated with aerobic exercise in conjunction with a hypocaloric diet are similar regardless whether or not an individual is fasted prior to training.

Figures

Figure 1
Figure 1
Percent macronutrient intake for FASTED.
Figure 2
Figure 2
Percent macronutrient intake for FED.

Similar articles

See all similar articles

Cited by 10 articles

See all "Cited by" articles

References

    1. Donnelly JE, Blair SN, Jakicic JM, Manore MM, Rankin JW, Smith BK, American College of Sports Medicine American college of sports medicine position stand. Appropriate physical activity intervention strategies for weight loss and prevention of weight regain for adults. Med Sci Sports Exerc. 2009;41(2):459–471. doi: 10.1249/MSS.0b013e3181949333. - DOI - PubMed
    1. Wu T, Gao X, Chen M, van Dam RM. Long-term effectiveness of diet-plus-exercise interventions vs. diet-only interventions for weight loss: a meta-analysis. Obes Rev. 2009;10(3):313–323. doi: 10.1111/j.1467-789X.2008.00547.x. - DOI - PubMed
    1. Hall KD, Heymsfield SB, Kemnitz JW, Klein S, Schoeller DA, Speakman JR. Energy balance and its components: implications for body weight regulation. Am J Clin Nutr. 2012;95(4):989–994. doi: 10.3945/ajcn.112.036350. - DOI - PMC - PubMed
    1. Laye MJ, Thyfault JP, Stump CS, Booth FW. Inactivity induces increases in abdominal fat. J Appl Physiol. 2007;102(4):1341–1347. doi: 10.1152/japplphysiol.01018.2006. - DOI - PubMed
    1. Hunter GR, Brock DW, Byrne NM, Chandler-Laney PC, Del Corral P, Gower BA. Exercise training prevents regain of visceral fat for 1 year following weight loss. Obesity (Silver Spring) 2010;18(4):690–695. doi: 10.1038/oby.2009.316. - DOI - PMC - PubMed

LinkOut - more resources

Feedback