Efeito de diferentes protocolos do exercício rosca 21 sobre a percepção subjetiva de esforço, inchaço muscular e análise cinemática: um estudo de caso

Abstract

This case study aimed to evaluate the impact of different combinations of the "21 Curl" on the subjective perception of exertion and muscle swelling. The study involved a 29-year-old male with approximately 10 years of bodybuilding experience. To initiate the protocol, a 1RM test was performed to establish the maximum weight. The “21 curl” was prescribed with a weight corresponding to 50% of 1 RM. There were 8 sessions (2 familiarization sessions and 6 intervention sessions) with intervals of 48 to 72 hours between each session. In the intervention sessions, the following combinations of the “21 curl” exercise were used: Initial Partial Range (IPR): full elbow extension to half of the total range of extension (90°); Final Partial Range (FPR): from half of the total elbow extension (90°) to full elbow flexion; Full Range (FR): full execution of elbow flexion, totaling 6 possible combinations. Two sets of the given combination were performed each day and filmed for 2D kinematic analysis. At the end of each set, SPE was collected, and swelling was determined by ultrasound before and after the two sets. Combination “A” had the smallest percentage of swelling, at 9.32%, and Combination “E” had the largest, at 28.25%. Combination “A” had TTs of 28.5 and 30.8, and horizontal displacement of the elbow axis of 11.1 and 13.2. There was no difference in SPE across the different combinations. Different combinations appear to produce similar demands, except for "combination A," where the control variables TT and DH were decisive for the outcome. Time under tension and accessory movements had a greater impact on muscle swelling than the different combinations. Therefore, controlling structural variables may have a greater influence on muscle swelling than choosing different combinations of the "21 curl" exercise.