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9 pages, 401 KiB

Open AccessArticle

The Positive Effects on Volleyball Receiving Skills When Training with Lighter Balls

by Kuo-Chuan Lin, Chi-Yao Chang, Min-Hao Hung and Wei-Ming Lin

Appl. Sci. 2022, 12(19), 9692; https://doi.org/10.3390/app12199692 - 27 Sep 2022

Cited by 2 | Viewed by 5564

The purpose of this study was to investigate the receiving ability and efficacy of volleyball players, which can be effectively improved after practicing with volleyballs of different weights. In this study, 36 elite male volleyball players were recruited and participated in a four-week [...] Read more.

The purpose of this study was to investigate the receiving ability and efficacy of volleyball players, which can be effectively improved after practicing with volleyballs of different weights. In this study, 36 elite male volleyball players were recruited and participated in a four-week training program in four groups: a lighter-ball training group (LBTG), a heavier-ball training group (HBTG), a normal-ball training group (NBTG), and a control group (CG). All subjects were required to evaluate their receiving ability during the initial training (week-0) and then to reevaluate it after two (week-2) and four (week-4) weeks of training. The statistical analysis revealed that the time factor (F_{2, 64} = 209.346, p < 0.001) and the time × group factor (F_{6, 64} = 17.463, p < 0.001) were significant but the group factor (F_{3, 32} = 0.340, p = 0.797) was not. The results revealed that the LBTG experienced a significant positive effect on the receiving test after four weeks of training, with an 8.6% improvement in skill performance after two weeks and a 16.4% improvement after four weeks. The HBTG, NBTG, and CG improved by 2.6%, 5.3%, and 3.8% after two weeks and by 6.3%, 9.3%, and 4.3% after four weeks, respectively. The main findings were that four weeks of volleyball training with a lighter ball resulted in significant improvements in player performance. In contrast, training with a ball with 70 g of added mass did not effectively enhance motor ability development. Full article

(This article belongs to the Special Issue Performance Analysis and Technology in Sport and Exercise)

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8 pages, 6341 KiB

Open AccessArticle

Kinematic Characteristics of Snatch Techniques in an Elite World-Record Holder of Weightlifting: A Case Study

by Weiming Cao, Linfei Dan, Jiaxiang Yan, Jianshe Li and Zhiqiang Liang

Appl. Sci. 2022, 12(19), 9679; https://doi.org/10.3390/app12199679 - 27 Sep 2022

Cited by 1 | Viewed by 1854

Abstract

Aim: This study aimed to analyze the kinematic characteristics of snatch techniques in a world-class weightlifter who holds the world record in the 73 kg category. Methods: Two high-speed cameras (Sony, Tokyo, Japan, 25 Hz) were used to collect kinematic data at the [...] Read more.

Aim: This study aimed to analyze the kinematic characteristics of snatch techniques in a world-class weightlifter who holds the world record in the 73 kg category. Methods: Two high-speed cameras (Sony, Tokyo, Japan, 25 Hz) were used to collect kinematic data at the 2019 Weightlifting World Championships. The SIMI° motion capture system (Simi Reality Motion Systems GmbH, Munich, Germany, 50 Hz) was used to analyze the snatch performance. Results: The lower limb movement during the first pulling stage showed a similar trajectory to elite weightlifters. The athlete showed 5.62° of knee flexion along with continuously increasing barbell velocity (maximal velocity up to 1.90 m/s) in the second pulling. Considering the perimeters of technical stability, the maximal value of the distance between the center of gravity of the human body and that of the barbell was 17.20 cm after the second pull. In addition, the barbell center simultaneously shifted 7.00 cm to the right. Conclusions: These results suggest that the world-record weightlifter possesses special technical characteristics. This personalized technical model provides basic information for the training of other elite weightlifters. Full article

(This article belongs to the Special Issue Performance Analysis and Technology in Sport and Exercise)

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14 pages, 262 KiB

Open AccessArticle

Reliability of Wu Huanqun’s Table Tennis Game Analysis Method in Authors’ Own Modification

by Jerzy Grycan, Małgorzata Kołodziej and Ziemowit Bańkosz

Appl. Sci. 2022, 12(16), 8235; https://doi.org/10.3390/app12168235 - 17 Aug 2022

Cited by 2 | Viewed by 2060

Abstract

The observation and analysis of the game or the player’s behavior and actions is a very important aspect of optimizing sports training in table tennis. The aim of this study was to present the applied method of observation, developed by Professor Wu Huanqun [...] Read more.

The observation and analysis of the game or the player’s behavior and actions is a very important aspect of optimizing sports training in table tennis. The aim of this study was to present the applied method of observation, developed by Professor Wu Huanqun and modified by the authors, together with an assessment of its reliability. The method consists in observing the winning actions of a given player and the same actions of his opponent in parallel, on three levels of complexity. Levels 1, 2, and 3 are concerned with identifying increasingly detailed winning strokes and stroke combinations. To assess the reliability of the method, seven experts independently analyzed the men’s final game of the World Championship 2019. Kendall’s coefficient of concordance, with an χ² significance test, was used to assess the compliance of the experts. Cronbach’s alpha was used to assess internal consistency. The obtained results indicate the high compliance and internal consistency (thus, high reliability) of the assessed method: the highest at the Level 1 observation level and the smallest, but significant, at Level 3. The performed statistical analysis indicates a high agreement between the experts’ opinions, which was taken as a measure of high reliability for the described method of observation. Full article

(This article belongs to the Special Issue Performance Analysis and Technology in Sport and Exercise)

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