Author(s): REN, X., Institution: SHANGHAI RESEARCH INSTITUTE OF SPORTS SCIENCE, Country: CHINA, Abstract-ID: 935

INTRODUCTION:
This study explores the effect of four weeks BodyBlade exercise training on shoulder joint proprioception and muscle strength of adolescent male volleyball players. Through an experimental study on 16 young male volleyball players, it was found that after four weeks of BodyBlade exercise, the players shoulder joint proprioception and muscle strength had changed.
METHODS:
16 male volleyball players, with average age of (17.21±1.36) years, average height of (193.07±4.44) cm, average weight of (77.93±8.03) kg, were included in the study. BodyBlade exercise training Protocol: The training involved the use of a primary shoulder joint vibration rod exercise, with one-minute sets, three sets per session, and a frequency of twice a week. The following parameters were assessed: Maximum peak torque of the dominant shoulders external rotation at 90 degrees using the Isomed2000 test at a velocity of 60°/s. Assessment of proprioception involving the dominant shoulder, positioned at 90 degrees of abduction and internal rotated to 60 degrees and external rotated to 30 degrees, using the Isomed2000 test at a velocity of 2°/s. Evaluation of strength perception for replicating 25% of the maximum isometric strength of the dominant shoulder using the Isomed2000. Changes in upper limb dynamic balance before and after intervention were assessed using the Upper Limb Y Balance Test.
RESULTS:
The results showed significant changes in various measures before and after the intervention. The average internal rotation isokinetic muscle strength before the intervention was (47±14.04) Nm, which increased to (50.44±16.09)Nm after the intervention. The maximum peak external rotation moment decreased from (35.06±10.04) Nm to (33.63±12.27) Nm. The sense of position errors for external rotation at 30° and internal rotation at 60° also improved significantly. The force sense difference for internal rotation increased from (1.72±1.6) Nm to (2.30±1.68) Nm, while the force sense difference for external rotation increased from (2.56±3.04) Nm to (3.61±3.22) Nm. The upper limb Y balance test scores on the dominant side also improved from 90.25±15.44 to 96.65±12.02.
CONCLUSION:
Four weeks of BodyBlade exercise training resulted in significant improvements in shoulder joint proprioception and muscle strength in teenage male volleyball players. These findings suggest that this type of training can be beneficial for enhancing the performance of these athletes.