An analysis of whole-body kinematics, muscle strength and activity during cross-step topspin among table tennis players

Author(s):  
Ming-Zhu Chen ◽  
Xin Wang ◽  
Qi Chen ◽  
Yue Ma ◽  
Ivan Malagoli Lanzoni ◽  
...  
2017 ◽  
Vol 5 (2_suppl2) ◽  
pp. 2325967117S0006
Author(s):  
Bihter Akınoğlu ◽  
Tuğba Kocahan ◽  
Necmiye Ün Yıldırım ◽  
Çağlar Soylu ◽  
Ufuk Apur ◽  
...  

Aim: The aim of this study was to compare isokinetic muscle strength of wrist flexor and extensor muscles in paralympic athletes. Methods: This study was carried out with the participation of 9 (4 females and 5 males) wheelchair (WC) table tennis players aged 24+3 and 8 male WC basketball players aged 26+3, met the criteria and voluntarly participate in the study. Body weight, height, body mass index and dominant extremity of the study subjects were recorded. İsokinetic measurement were performed with Isomed 2000® device. İsokinetic testing protocol; before the test all players performed the wrist flexion and extension isokinetic test with the 5 repeating at 90º/sec as a warm-up and comprehending the test. Then, wrist flexion and extension concentric-concentric strength measurements were performed with the 5 repeating at 60º/sec and with the 15 repeating at 240º/sec with the angle between 50 degrees of wrist flexion and 60 degrees of wrist extension and peak torque, peak torque/kg values and flexion/extension ratios were recorded. Mann-Whitney U test was used to compare isokinetic muscle strength quantitative variables in athletes. Findings: Isokinetic muscle strength of wrist flexors and extensors was higher in both sides in WC table tennis players with 60º/sec speed (p<0,05). İsokinetic muscle strength of wrist flexors and extensors was higher in both sides in WC basketball players with 240º/sec speed (p<0,05). There was no significant difference statistically between the groups in isokinetic wrist flexion and extansion peak torque/kg ratio in all speeds (p>0,05). Wrist flexion/extension peak torque ratios were similar in both groups. When examining the athletes flexion/extension ratios, wrist extensor muscles were weaker than flexor muscles and flexor muscles were average twice stronger than extensor muscles in both sports ( Table1 ). [Table: see text] Results: We thought that imbalance of muscle strength in the wrist may have occurred because of the use of a WC and requiring the intensive wrist flexors in playing sports. In both groups wrist ekstansor muscles were found to be weaker than wrist flexors and flexor/extensor ratio was found to be imbalance. We believe that all athletes using WC such as WC table tennis and WC basketball players have a strenght imbalance in the muscle of the wrist and as a result, this situation will increase the possibility of injury. Therefore, our study showed that weakness of wrist extensors and imbalance of muscle stenght should be taken into account in WC athletes in athletic training and exercise programs.


2017 ◽  
Vol 21 (4) ◽  
pp. 1033-1036 ◽  
Author(s):  
Raoyrin Chanavirut ◽  
Nontawit Udompanich ◽  
Phraophimon Udom ◽  
Ponlapat Yonglitthipagon ◽  
Wanida Donpunha ◽  
...  

1998 ◽  
Vol 1 (1) ◽  
pp. 23-39
Author(s):  
Carter J. Kerk ◽  
Don B. Chaffin ◽  
W. Monroe Keyserling

The stability constraints of a two-dimensional static human force exertion capability model (2DHFEC) were evaluated with subjects of varying anthropometry and strength capabilities performing manual exertions. The biomechanical model comprehensively estimated human force exertion capability under sagittally symmetric static conditions using constraints from three classes: stability, joint muscle strength, and coefficient of friction. Experimental results showed the concept of stability must be considered with joint muscle strength capability and coefficient of friction in predicting hand force exertion capability. Information was gained concerning foot modeling parameters as they affect whole-body stability. Findings indicated that stability limits should be placed approximately 37 % the ankle joint center to the posterior-most point of the foot and 130 % the distance from the ankle joint center to the maximal medial protuberance (the ball of the foot). 2DHFEC provided improvements over existing models, especially where horizontal push/pull forces create balance concerns.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhenhui Yang ◽  
Tiev Miller ◽  
Zou Xiang ◽  
Marco Y. C. Pang

AbstractThis randomized controlled trial aimed to evaluate the effects of different whole body vibration (WBV) frequencies on concentric and eccentric leg muscle strength, bone turnover and walking endurance after stroke. The study involved eighty-four individuals with chronic stroke (mean age = 59.7 years, SD = 6.5) with mild to moderate motor impairment (Fugl-Meyer Assessment lower limb motor score: mean = 24.0, SD = 3.5) randomly assigned to either a 20 Hz or 30 Hz WBV intervention program. Both programs involved 3 training sessions per week for 8 weeks. Isokinetic knee concentric and eccentric extension strength, serum level of cross-linked N-telopeptides of type I collagen (NTx), and walking endurance (6-min walk test; 6MWT) were assessed at baseline and post-intervention. An intention-to-treat analysis revealed a significant time effect for all muscle strength outcomes and NTx, but not for 6MWT. The time-by-group interaction was only significant for the paretic eccentric knee extensor work, with a medium effect size (0.44; 95% CI: 0.01, 0.87). Both WBV protocols were effective in improving leg muscle strength and reducing bone resorption. Comparatively greater improvement in paretic eccentric leg strength was observed for the 30 Hz protocol.


2021 ◽  
pp. 1-19
Author(s):  
Manuel J. Coelho-e-Silva ◽  
Jan M. Konarski ◽  
Magdalena Krzykała ◽  
Szymon Galas ◽  
Pluta Beata ◽  
...  

Author(s):  
Jincheng Yu ◽  
Yonatan Asher Vexler ◽  
Rongzhi Li

Modern information technology is more and more widely used in school physical education. At the same time, the application of multimedia technology is becoming more and more extensive in education. As a teaching method, multimedia has developed into an important component of modern educational technology and science, and also provides support for teaching reform. The use of multimedia organization teaching can make up for the shortcomings of traditional physical education, promote the development of physical education, cultivate students' lifelong sports awareness and enhance physical fitness. Physical education is an important component of modern education, and its reform is also the trend of the times. According to the characteristics of the ordinary group of college table tennis, exploring the use of multimedia teaching platform can make the table tennis class more vivid and interesting, let students master some basic skills and skills of table tennis in a short period of time, understand and experience table tennis. The competition process enhances student interest and serves lifelong sports.


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