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Effects of an 8-Week Plyometric Depth Jump Training Program on Badminton Smash Accuracy and Lower Body Power in Amateur Athletes: A Randomized Controlled Trial Vickery, Tina; Azevedo , Eugénia; Németh, Zsolt; Frazer , Mellissa
INSPIREE: Indonesian Sport Innovation Review Vol. 6 No. 02 (2025): May 27, 2025
Publisher : INSPIRETECH GLOBAL INSIGHT & DPE Universitas Pahlawan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53905/inspiree.v6i02.151

Abstract

Purpose of The Study. To investigate the effects of an 8-week plyometric depth jump training program on badminton smash accuracy in amateur athletes and examine the relationship between lower body power development and overhead striking precision. Material and methods. Twenty-four amateur badminton athletes (14 males, 10 females; age: 19-25 years) were randomly assigned to experimental (n=12) and control (n=12) groups. The experimental group performed progressive plyometric depth jump training three times per week in addition to regular badminton practice, while the control group maintained only regular practice. Platform heights progressed from 40-55 cm over 8 weeks. Smash accuracy, vertical jump performance, ground contact time, and movement efficiency were assessed pre- and post-intervention. Results. The experimental group demonstrated significant improvements in smash accuracy (29.6%, p < 0.001, d = 2.21), vertical jump height (13.2%, p < 0.001, d = 1.78), and ground contact time (15.7% reduction, p < 0.001). Strong correlations were observed between vertical jump improvements and accuracy enhancements (r = 0.76, p < 0.001). The control group showed minimal changes (4.4% improvement in accuracy, p = 0.089). No significant gender differences were found in adaptation rates (p = 0.085). Conclusions. An 8-week plyometric depth jump training program significantly improves badminton smash accuracy in amateur athletes, suggesting that enhanced lower body power development directly contributes to improved striking precision. The findings support integrating structured plyometric training into regular badminton practice for technical skill enhancement.
Influence of Teacher Perceptions and Self-Efficacy in Teaching Science in Kindergarten Syamsuyurnita, Syamsuyurnita; Vickery, Tina; Pardilla, Herli; Frazer, Mellissa
Journal of Foundational Learning and Child Development Vol. 1 No. 02 (2025): Foundation Learning in Education
Publisher : CV. INSPIRETECH GLOBAL INSIGHT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53905/ChildDev.v1i02.11

Abstract

Purpose of the study: Early childhood science education forms the foundation for students' scientific literacy and inquiry skills. Teacher perceptions and self-efficacy beliefs significantly influence the quality and frequency of science instruction in kindergarten settings. Understanding these factors is crucial for improving early science education outcomes. This study aimed to examine the relationship between kindergarten teachers' perceptions of science teaching and their self-efficacy beliefs, and to determine how these factors influence science instruction practices in Indonesian kindergarten settings. Materials and methods: A quantitative cross-sectional study was conducted with 135 kindergarten teachers from 27 kindergarten institutions in Pekanbaru City, Indonesia. Data were collected using validated questionnaires measuring teacher perceptions of science teaching importance, self-efficacy beliefs, and science teaching practices. Statistical analyses were performed using SPSS version 29.0. Results: Results revealed a significant positive correlation (r = 0.742, p < 0.001) between teacher self-efficacy and frequency of science instruction. Teachers with higher self-efficacy scores (M = 4.23, SD = 0.58) demonstrated more positive perceptions toward science teaching compared to those with lower self-efficacy (M = 3.45, SD = 0.72). Multiple regression analysis indicated that self-efficacy beliefs explained 55.1% of the variance in science teaching practices. Conclusions: Teacher self-efficacy emerged as the strongest predictor of effective science instruction in kindergarten settings. Professional development programs focusing on enhancing teacher confidence and competence in science education are essential for improving early childhood science learning outcomes.