Effects of phosphatidic acid supplementation on muscle thickness and strength in resistance-trained men

The purpose of this study was to investigate the effects of phosphatidic acid (PA) supplementation on muscle thickness and strength following an 8 week supervised resistance-training program. Fifteen resistance trained men (22.8 ± 3.5 years; 80.6 ± 8.7 kg; 178.1 ± 5.6 cm; 14.6% ± 8.8% body fat) were...

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Bibliographic Details
Published in:	Applied physiology, nutrition, and metabolism Vol. 42; no. 4; p. 443
Main Authors:	Gonzalez, Adam M, Sell, Katie M, Ghigiarelli, Jamie J, Kelly, Christopher F, Shone, Edward W, Accetta, Matthew R, Baum, Jamie B, Mangine, Gerald T
Format:	Journal Article
Language:	English
Published:	Canada 01-04-2017
Subjects:	Adult Athletes Athletic Performance Dietary Fats - administration & dosage Dietary Fats - adverse effects Dietary Supplements - adverse effects Double-Blind Method Humans Male Muscle Development Muscle Strength Muscle, Skeletal - diagnostic imaging Muscle, Skeletal - growth & development Patient Compliance Performance-Enhancing Substances - administration & dosage Performance-Enhancing Substances - adverse effects Phosphatidic Acids - administration & dosage Phosphatidic Acids - adverse effects Reproducibility of Results Resistance Training Ultrasonography Weight Lifting Young Adult resistance training entraînement contre résistance ergogenic aid nutritional supplement supplément nutritif facteur ergogène phospholipide croissance musculaire phospholipid muscle growth
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Summary:	The purpose of this study was to investigate the effects of phosphatidic acid (PA) supplementation on muscle thickness and strength following an 8 week supervised resistance-training program. Fifteen resistance trained men (22.8 ± 3.5 years; 80.6 ± 8.7 kg; 178.1 ± 5.6 cm; 14.6% ± 8.8% body fat) were randomly assigned to a group that either consumed 750 mg of PA or a placebo (PL). Testing was carried out before (PRE) and after (POST) training/supplementation for muscle thickness and strength. Muscle thickness of the rectus femoris (RF), vastus lateralis (VL), biceps brachii (BB), and triceps brachii (TB) muscles were measured via ultrasonography, along with 1 repetition maximum (1RM) of squat, deadlift, and bench press. Analysis of covariance (ANCOVA), using PRE values as the covariate, did not reveal any group differences for measures of muscle thickness in the RF (PA: 3.6% ± 5.2%; PL: 3.2% ± 4.2%, p = 0.97), VL (PA: 23.4% ± 18.1%, PL: 12.5% ± 15.4%, p = 0.37), BB (PA: 3.7% ± 6.4%, PL: 9.6% ± 12.4%, p = 0.86), or TB (PA: 15.1% ± 17.9%, PL: 10.7% ± 19.3%, p = 0.79). Likewise, no group differences were observed in changes in squat (PA: 8.4% ± 4.1%, PL: 8.1% ± 4.2%, p = 0.79), deadlift (PA: 10.1% ± 10.1%, PL: 8.9% ± 9.5%, p = 0.66), or bench press (PA: 5.7% ± 5.5%, PL: 5.1% ± 3.0%, p = 0.76) exercises. Collectively, however, all participants experienced significant (p < 0.05) improvements in each measure of muscle thickness and strength. Results of this study suggest that PA supplementation, in combination with a 3 days·week resistance-training program for 8 weeks, did not have a differential effect compared with PL on changes in muscle thickness or 1RM strength.
ISSN:	1715-5320
DOI:	10.1139/apnm-2016-0564