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Influence of fish oil-derived n-3 fatty acid supplementation on changes in body composition and muscle strength during short-term weight loss in resistance-trained men

Philpott, Jordan D., Bootsma, Niels J., Rodriguez-Sanchez, Nidia, Hamilton, David Lee, Mackinlay, Elizabeth, Dick, James, Mettler, Samuel, Galloway, Stuart D. R., Tipton, Kevin D. and Witard, Oliver C. 2019, Influence of fish oil-derived n-3 fatty acid supplementation on changes in body composition and muscle strength during short-term weight loss in resistance-trained men, Frontiers in nutrition, vol. 6, pp. 1-11, doi: 10.3389/fnut.2019.00102.

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Title Influence of fish oil-derived n-3 fatty acid supplementation on changes in body composition and muscle strength during short-term weight loss in resistance-trained men
Author(s) Philpott, Jordan D.
Bootsma, Niels J.
Rodriguez-Sanchez, Nidia
Hamilton, David LeeORCID iD for Hamilton, David Lee orcid.org/0000-0002-5620-4788
Mackinlay, Elizabeth
Dick, James
Mettler, Samuel
Galloway, Stuart D. R.
Tipton, Kevin D.
Witard, Oliver C.
Journal name Frontiers in nutrition
Volume number 6
Article ID 102
Start page 1
End page 11
Total pages 11
Publisher Frontiers
Place of publication Lausanne, Switzerland
Publication date 2019-07
ISSN 2296-861X
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Nutrition & Dietetics
omega-3 polyunsaturated fatty acids
energy restriction
fat-free mass
fat mass
performance
athletes
SKELETAL-MUSCLE
PROTEIN-SYNTHESIS
MASS-LOSS
EXERCISE
DIET
BALANCE
Summary Background: A detrimental consequence of diet-induced weight loss, common in athletes who participate in weight cutting sports, is muscle loss. Dietary omega-3 polyunsaturated fatty acids (n-3PUFA) exhibit a protective effect on the loss of muscle tissue during catabolic situations such as injury-simulated leg immobilization. This study aimed to investigate the influence of dietary n-3PUFA supplementation on changes in body composition and muscle strength following short-term diet-induced weight loss in resistance-trained men. Methods: Twenty resistance-trained young (23 ± 1 years) men were randomly assigned to a fish oil group that supplemented their diet with 4 g n-3PUFA, 18 g carbohydrate, and 5 g protein (FO) or placebo group containing an equivalent carbohydrate and protein content (CON) over a 6 week period. During weeks 1–3, participants continued their habitual diet. During week 4, participants received all food items to control energy balance and a macronutrient composition of 50% carbohydrate, 35% fat, and 15% protein. During weeks 5 and 6, participants were fed an energy-restricted diet equivalent to 60% habitual energy intake. Body composition and strength were measured during weeks 1, 4, and 6. Results: The decline in total body mass (FO = −3.0 ± 0.3 kg, CON = −2.6 ± 0.3 kg), fat free mass (FO = −1.4 ± 0.3 kg, CON = −1.2 ± 0.3 kg) and fat mass (FO = −1.4 ± 0.2 kg, CON = −1.3 ± 0.3 kg) following energy restriction was similar between groups (all p > 0.05; d: 0.16–0.39). Non-dominant leg extension 1 RM increased (6.1 ± 3.4%) following energy restriction in FO (p < 0.05, d = 0.29), with no changes observed in CON (p > 0.05, d = 0.05). Dominant leg extension 1 RM tended to increase following energy restriction in FO (p = 0.09, d = 0.29), with no changes in CON (p > 0.05, d = 0.06). Changes in leg press 1 RM, maximum voluntary contraction and muscular endurance following energy restriction were similar between groups (p > 0.05, d = 0.05). Conclusion: Any possible improvements in muscle strength during short-term weight loss with n-3PUFA supplementation are not related to the modulation of FFM in resistance-trained men.
Language eng
DOI 10.3389/fnut.2019.00102
Indigenous content off
HERDC Research category C1 Refereed article in a scholarly journal
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30128705

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.