Research article - (2016)15, 532 - 539
Eight Weeks of Phosphatidic Acid Supplementation in Conjunction with Resistance Training Does Not Differentially Affect Body Composition and Muscle Strength in Resistance-Trained Men
Thomas L. Andre1, Joshua J. Gann1, Sarah K. McKinley-Barnard1, Joon J. Song2, Darryn S. Willoughby1
1Exercise & Biochemical Nutrition Laboratory; Department of Health, Human Performance, and Recreation, Baylor University, Waco, TX, USA
2Department of Statistical Science, Baylor University, Waco, USA

Darryn S. Willoughby
✉ PhD Department of Health, Human Performance, and Recreation, Baylor University, 1312 South 5th Street, Waco, TX 76798, USA
Email: darryn_willoughby@baylor.edu
Received: 06-07-2016 -- Accepted: 20-07-2016
Published (online): 05-08-2016
ABSTRACT

This study attempted to determine the effects of eight weeks of resistance training (RT) combined with phosphatidic acid (PA) supplementation at a dose of either 250 mg or 375 mg on body composition and muscle size and strength. Twenty-eight resistance-trained men were randomly assigned to ingest 375 mg [PA375 (n = 9)] or 250 mg [PA250 (n = 9)] of PA or 375 mg of placebo [PLC (n = 10)] daily for eight weeks with RT. Supplements were ingested 60 minutes prior to RT and in the morning on non-RT days. Participants’ body composition, muscle size, and lower-body muscle strength were determined before and after training/supplementation. Separate group x time ANOVAs for each criterion variable were used employing an alpha level of ≤ 0.05. Magnitude- based inferences were utilized to determine the likely or unlikely impact of PA on each criterion variable. A significant main effect for time was observed for improvements in total body mass (p = 0.003), lean mass (p = 0.008), rectus femoris cross-sectional area [RF CSA (p = 0.011)], and lower-body strength (p < 0.001), but no significant interactions were present (p > 0.05). Collectively, magnitude-based inferences determined both doses of PA to have a likely impact of increasing body mass (74.2%), lean mass (71.3%), RF CSA (92.2%), and very likely impact on increasing lower-body strength (98.1% beneficial). When combined with RT, it appears that PA has a more than likely impact on improving lower-body strength, whereas a likely impact exists for increasing muscle size and lean mass.
Key words: Phosphatidic acid, resistance training, body composition, muscle strength

Key Points
  • In response to eight weeks resistance training and PLC and PA (375 mg and 250 mg) supplementation, similar increases in lower-body muscle strength occurred in all three groups; however, the increases were not different between supplement groups.
  • In response to eight weeks resistance training and PLC and PA (375 mg and 250 mg) supplementation, similar increases in lean mass occurred in all three groups; however, the increases were not different between supplement groups.
  • In response to eight weeks resistance training and PLC and PA (375 mg and 250 mg) supplementation, similar increases in muscle mass (RF CSA) occurred in all three groups; however, the increases were not different between supplement groups.
  • Supplementation of PA in conjunction with RT does not impose a differential benefit; however, regarding trends in the data magnitude-based inferences indicate that PA has a more than likely impact on improving lower-body strength, whereas a likely impact for increasing muscle mass when combined with resistance training.








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Eight Weeks of Phosphatidic Acid Supplementation in Conjunction with Resistance Training Does Not Differentially Affect Body Composition and Muscle Strength in Resistance-Trained Men
Thomas L. Andre, Joshua J. Gann, Sarah K. McKinley-Barnard, Joon J. Song, Darryn S. Willoughby
2016(15), 532 - 539.
DOI: https://doi.org/