Abstract
BackgroundThe use of dietary supplements to improve performance is becoming increasingly popular among athletes and fitness enthusiasts. Unfortunately, there is a tremendous lack of research being done regarding female athletes and the use of sport supplements. The purpose of this study was to examine the acute effects of multi-ingredient pre-workout supplement (MIPS) ingestion on resting metabolism and exercise performance in recreationally-active females.MethodsFifteen recreationally-active females participated in a randomized, double-blind, placebo controlled study. Subjects completed baseline, and two experimental testing sessions in a cross-over design fashion. Experimental testing included assessment of resting energy expenditure (REE), heart rate, and blood pressure following the ingestion of a MIPS or placebo. Subjects also completed a repetition to failure test for the back squat (BS) and bench press (BP) at 85% of their 5-repetition maximum followed by the assessment of anaerobic power using a counter-movement vertical jump test and a sprint test on a force-treadmill. Subjective measurements of energy, focus, and fatigue were also assessed using a 5-point Likert scale. Separate repeated measures analysis of variance (ANOVA) were used to assess differences in REE, cardiovascular responses, and subjective markers between conditions. Performance data were analyzed using paired Student’s T-tests.ResultsA significant main effect for condition was observed for REE (p = 0.021) and diastolic blood pressure (p = 0.011) following ingestion of the MIPS. The supplement condition resulted in a greater number of BP repetitions to failure and total work completed during treadmill test (p = 0.039) compared to placebo (p = 0.037). A significant condition x time interaction for focus was observed with the supplement treatment exhibiting improved focus at 80-min post ingestion (p = 0.046).ConclusionsConsumption of a MIPS increased resting metabolism following a single dose accompanied by an increase in diastolic blood pressure. Furthermore, acute MIPS ingestion improved upper body muscular endurance and anaerobic capacity while improving feelings of focus following high-intensity exercise in recreationally active females.
Highlights
The use of dietary supplements to improve performance is becoming increasingly popular among athletes and fitness enthusiasts
Resting energy expenditure A significant main effect for condition was observed for resting energy expenditure (REE) (MIPS: 1497 ± 55.7; PLA: 1416 ± 42 kcal/day p = 0.043)
There was an overall main effect for condition regarding mean diastolic blood pressure following ingestion of the multi-ingredient pre-workout supplement (MIPS) compared to the PLA (MIPS: 84 ± 1.1; PLA: 64.8 ± 1.3 mmHg, p = 0.011); no significant condition x time interaction (p = 0.44) was observed
Summary
The use of dietary supplements to improve performance is becoming increasingly popular among athletes and fitness enthusiasts. A newer category of dietary supplements referred to as multi-ingredient pre-workout supplements (MIPS) have gained increased attention among active individuals These products are a class of supplements that typically include a combination of ingredients such as caffeine, taurine, branch-chain amino acids, creatine, glutamine, and β-alanine [2, 3]. More recent studies have focused on the effects of combining caffeine with a variety of ingredients, including beta-alanine, creatine, and various herbal extracts, for their potential synergistic benefits. Together, these ingredients offer specific physiological advantages, which often include enhanced energy availability, metabolism and improved buffering capacity of skeletal muscle [4, 5, 9]
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