Suplementação aguda de capsaicina com diferentes doses relativizadas e o desempenho de força e parâmetros psicofisiológicos em homens treinados em força

Abstract

Capsaicin is an agonist of the transient vanilloid type 1 receptor (TRPV1), which when activated in skeletal muscle, increases the influx of calcium into the sarcoplasm, with a possible increase in the capacity to generate and sustain muscle contraction. Therefore, this substance can be an ergogenic nutritional resource, generating promising results in strength training. The scientific literature presents conflicting results, suggesting studies with different and individualized doses. Therefore, the present study aims to compare the effectiveness of acute capsaicin supplementation in muscle strength tests and psychophysiological parameters with dosages relative to total body mass. The sample consisted of 19 male volunteers, with an average age of 23.4 ± 3.2 years, and experience of 4.4 ± 3 years in strength training. The volunteers consumed the low dosage of capsaicin (0.15 mg/kg) (BCAP), or the high dosage of capsaicin (0.35 mg/kg) (ACAP) or the placebo (PLA). After 45 minutes, they performed the countermovement jump test (SCM) to measure jump height and power. Subsequently, the maximum voluntary isometric contraction test (MVIC) was performed to measure maximum isometric strength. Then, a strength protocol was carried out in the free squat exercise, evaluating the total volume (VT) (repetitions x displaced mass), in addition to movement speed (VM), lactate concentration, heart rate variability and perception subjective effort. The results demonstrated a significant increase in total volume with the ACAP dosage (p=0.019). However, no significant changes were found in the results obtained in the SCM test parameters, jump height (p=0.611) and power (p=0.392), as well as in maximum MVIC strength (p=0.587), with no dose of capsaicin. Likewise, there were no changes in MV (p=0.495), as well as in lactate concentration (p=0.733), LnRMSSD (p=0.624), HF/LH ratio (p=0.543) and RPE (p=0.554), regardless of the dose of capsaicin supplemented. Therefore, acute capsaicin supplementation can increase VT, but only at high doses. However, this substance is not capable of altering the results of SCM and maximum isometric strength tests, as well as the response in psychophysiological parameters.