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

ABSTRACT

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 y; 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 one repetition maximum (1RM) of squat, deadlift, and bench press. Analysis of covariance, 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-1 resistance-training program for 8-weeks, did not have a differential effect compared to PL on changes in muscle thickness or 1RM strength.

http://www.nrcresearchpress.com/doi/abs/...-2016-0564


Cliffs: studie laat geen effect zien van fosfatidezuursuppletie op spierdikte en krachtwinst bij getrainde mannen. Eerder (zeer vergelijkbaar) onderzoek liet soms wel wat zien met hocus-pocus-statistiek (magnitude-based inference), en 1 enkel onderzoek liet met normale statistiek een verbetering zien in de lean body mass en kracht van het onderlichaam. Mogelijk werkt fosfatidezuur gewoon niet, of is het effect best klein (deze studie was ook kleinschalig met maar vijftien proefpersonen).


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#2
Binnenkort wordt ook mijn review over fosfatidezuur gepubliceerd. Hierin behandel ik o.a. deze studie.

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