Desempenho de escaladoras no campus board instrumentalizado: comparação entre bote com contramovimento e bote concêntrico

Abstract

The stretch-shortening cycle (SSC) muscle action is already known to allow greater strength production compared to concentric action and to influence the performance of athletes in different sports. Its presence in countermovement vertical jumps is well established, but less investigated when it comes to upper limbs, especially in sports such as climbing. The objectives of the present study were to compare the performance through the vertical displacement of the L5-S1 point between the dyno with countermovement (Bote CAE) and the concentric dyno (Bote CON) and to relate the performance in the Bote CAE with the speed of the eccentric and the transition time between eccentric and concentric action. The sample consisted of 15 advanced and elite climbers who performed both types of exercise on the Campus Board instrumented with load cells. In addition to the dynamic analysis, a kinematic analysis was also performed using two Go Pro cameras positioned in the frontal and sagittal planes. A first session with anthropometric evaluation and familiarization of the exercises was carried out, and a second session with warm-up, determination of the maximum height of the dyno. The test to determine the maximum height consisted of five repetitions of the Bote CAE and the Bote CON. The vertical displacement of the L5-S1 point was not different between the exercises (dBote CAE= 38 cm and dBote CON = 39 cm). The eccentric action velocity had an average value of 0.54 ± 0.13m/s and explained 49% of the vertical displacement in the CAE Boat. The transition time in Bote CAE presented an average of 240.53 ± 64.12ms and had no significant relationship with the vertical displacement, showing that this factor may not have influenced the adequate use of the mechanisms of potentiation of muscle strength in the concentric phase from of the SSC. The similarity of performance between Bote CAE and CON may have occurred due to the change in the movement technique due to the characteristic of the sample and the non appropriate use of the SSC, probably due to the little experience with this type of demand or the climbing characteristic in which the maximum force of the upper limbs and trunk have to move the entire body mass. On Campus board, the expected benefits in the vertical displacement of the body involving the SSC (Bote CAE) were not verified when compared with a concentric action (Bote CON).