Effects of a Pre-workout Energy Drink Supplement on Upper BodyMuscular Endurance Performance

The use of pre-workout beverages is becoming an increasinglycommon method of improving performance during exercise in athleticand recreationally active populations. Therefore, the purpose ofthis study was to investigate the effects of a commerciallyavailable energy drink on exercise performance. Thirty-one healthymales (n=23) and females (n=8) participated in this study and wereseparated into two groups: supplement (SU; n=16) or placebo (PL;n=15). Subjects visited the laboratory on 2 occasions separated byno more than 7 days. The first visit consisted of completing a pushup to fatigue protocol (PUFP) without ingesting the pre-workoutenergy drink supplement (PWEDS). The second visit consisted ofingesting either a placebo or the PWEDS 30 minutes prior tocompleting the PUFP. Rate of perceived exertion (RPE) was recordedfollowing each set of pushups on both testing days. Also,participant's height, weight, and body composition were collected.There was no significant differences at baseline in any variablebetween groups (p = >.05). After the second testing session,both groups significantly improved total push-ups (PL Pre: 133.3±39.4, PL Post: 155.3 ± 54.1; SU Pre: 139.3 ± 58.5, SU Post: 161.3± 79.4; p=<.001), and push-ups completed in each of the 3 sets(p=<.001), when compared to baseline. Post-testing revealed nosignificant difference between groups in total push-ups completedor RPE at any time point, when compared to baseline. In conclusion,the commercially available PWEDS offered no additional ergogeniceffects when compared to the placebo.

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