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. 2017 Jun 10;5(2):36.
doi: 10.3390/sports5020036.

Ingestion of an Amino Acid Electrolyte Beverage during Resistance Exercise Does Not Impact Fluid Shifts into Muscle or Performance

JohnEric W Smith  1 , Ben M Krings  2 , Timothy J Peterson  3 , Jaden A Rountree  4 , Roksana B Zak  5 , Matthew J McAllister  6
Affiliations

Ingestion of an Amino Acid Electrolyte Beverage during Resistance Exercise Does Not Impact Fluid Shifts into Muscle or Performance

JohnEric W Smith et al. Sports (Basel). .

Abstract

The purpose of this study was to investigate the impact of ingesting an amino acid-electrolyte (AAE) beverage during upper body resistance exercise on transient muscle hypertrophy, exercise performance, markers of muscle damage, and recovery. Participants (n = 15) performed three sets of six repetitions-bench press, lat pull down, incline press, and seated row-followed by three sets of eight repetitions at 75% of the estimated 1 repetition maximum-triceps kickback, hammer curl, triceps push down, and preacher curl-with 90 s of rest between sets. The final set of the push down/preacher curl was performed to failure. Prior to and immediately post-exercise, as well as 24, 48, and 72 h post exercise, cross-sectional muscle thickness was measured. Blood samples were collected prior to exercise, as well as 24, 48, and 72 h post-exercise for serum creatine kinase (CK) analysis. No treatment effect was found for muscle cross-sectional area, repetitions to failure, or serum CK. A main effect (p < 0.001) was observed in the change in serum CK levels in the days following the resistance exercise session. The findings of this study suggest that the acute ingestion of a AAE beverage does not alter acute muscle thickness, performance, perceived soreness and weakness, or markers of muscle damage.

Keywords: ergogenic aid; muscle fatigue; muscle pump; supplementation.

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Conflict of interest statement

JohnEric W. Smith is a member of the Dymatize Nutrition Advisory Board. Other authors declare no potential conflicts of interest. Dymatize Enterprises, LLC, provided beverage powder for this study but had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.

Figures

Figure 1
Figure 1
Impact of an amino acid-electrolyte (AAE) beverage on muscle fatigue during superset repetitions to muscular failure. Data are presented as mean ± SD.
Figure 2
Figure 2
Impact of an AAE beverage on muscle thickness in the 3 days following resistance exercise with acute supplementation. No difference between treatments. ‡ Denotes significant time difference from pre (p < 0.05). * Denotes significant time difference from 24 h post, 48 h post, and 72 h post. Data are presented as mean ± SD.
Figure 3
Figure 3
Impact of AAE beverage on muscle soreness in the 3 days following resistance exercise with acute supplementation. No significant difference between treatments. *, ‡, ◊, and § used to identify all time points different from one another (p < 0.05). Data are presented as mean ± SD.
Figure 4
Figure 4
Impact of an AAE beverage on muscle weakness in the 3 days following resistance exercise with acute supplementation. No difference between treatments. *, ‡, ◊, and § used to identify all time points significantly different from one another (p < 0.05).
Figure 5
Figure 5
Impact of an AAE beverage on serum CK in the 3 days following resistance exercise with acute supplementation. No difference between treatments. * Denotes significant time difference (p < 0.05) from pre, 48 h post, and 72 h post. ‡ Denotes significant difference from 72 h post. Data are presented as mean ± SD.
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