Acute Effects of Different Plyometric and Strength Exercises on Balance Performance in Youth Weightlifters

• Published in: Frontiers in physiology 2021-09, Vol.12, p.716981-716981
• Main Authors: Werfelli, Hanen, Hammami, Raouf, Selmi, Mohamed Amine, Selmi, Walid, Gabrilo, Goran, Clark, Cain C. T., Duncan, Michael, Sekulic, Damir, Granacher, Urs, Rebai, Haithem
• Format: Article
• Language: English
• Subjects: adolescents; conditioning exercise; Physiology; postural stability; weightlifting
• ISSN: 1664-042X; 1664-042X
• DOI: 10.3389/fphys.2021.716981

Background: High-intensity muscle actions have the potential to temporarily improve the performance which has been denoted as postactivation performance enhancement. Objectives: This study determined the acute effects of different stretch-shortening (fast vs. low) and strength (dynamic vs. isometric) exercises executed during one training session on subsequent balance performance in youth weightlifters. Materials and Methods: Sixteen male and female young weightlifters, aged 11.3±0.6years, performed four strength exercise conditions in randomized order, including dynamic strength (DYN; 3 sets of 3 repetitions of 10 RM) and isometric strength exercises (ISOM; 3 sets of maintaining 3s of 10 RM of back-squat), as well as fast (FSSC; 3 sets of 3 repetitions of 20-cm drop-jumps) and slow (SSSC; 3 sets of 3 hurdle jumps over a 20-cm obstacle) stretch-shortening cycle protocols. Balance performance was tested before and after each of the four exercise conditions in bipedal stance on an unstable surface (i.e., BOSU ball with flat side facing up) using two dependent variables, i.e., center of pressure surface area (CoP SA) and velocity (CoP V). Results: There was a significant effect of time on CoP SA and CoP V [ F (1,60)=54.37, d =1.88, p