scholarly journals Efficiency Assessment of Tai Chi Exercises in Physical Rehabilitation of Knee Joint in Young Rhythmic Gymnasts and Choreography Students

2021 ◽  
pp. 115-125
Author(s):  
Oleg S. Vasil’ev ◽  
◽  
Sergey P. Levushkin ◽  
Evgeniy E. Achkasov ◽  
Vladimir I. Lyakh ◽  
...  
Keyword(s):  
Knee Joint ◽  
High Speed ◽  
Tai Chi ◽  
Peak Torque ◽  
Physical Rehabilitation ◽  
Strength Parameters ◽  
Functional Parameters ◽  
Efficiency Assessment ◽  
Rhythmic Gymnasts ◽  
Deceleration Time

Various types of physical activity, including tai chi exercises, have become part of physical rehabilitation of young athletes after knee joint injury. However, many physiological mechanisms of the restorative effect of traditional systems still need to be clarified. We recruited 38 girls aged 10–16 years (mean age 12.5 years, interquartile range [10.8; 13.2] years) involved in different types of physical activity (rhythmic gymnastics and choreography) needing to recover their knee joint function after overuse injury. The subjects were divided into two groups: the main group (physical rehabilitation using a specially developed set of tai chi movements) and the control group (standard course of physical rehabilitation taking place in a physical therapy room). After 2 weeks of rehabilitation, the participants underwent isokinetic testing of the knee joint using the Biodex System 4 Pro (USA). The test results obtained by cluster analysis were typified into three characteristic patterns (χ2 test, p = 0.004): 1) insufficiency of strength parameters (peak torque (PT), peak torque to body mass (PT/BM)) at high speed and insufficiency of functional parameters (PT angle, deceleration time) at high speed; 2) insufficiency of functional parameters (time to PT, deceleration time); 3) insufficiency of strength parameters (PT, PT/BM). It was shown that while the classical means of physical rehabilitation are good for restoring the dynamic muscle parameters (PT), tai chi exercises optimally restore the functional parameters of muscle activation (TP angle and deceleration time). For citation: Vasil’ev O.S., Levushkin S.P., Achkasov E.E., Lyakh V.I., Sharapov A.N. Efficiency Assessment of Tai Chi Exercises in Physical Rehabilitation of Knee Joint in Young Rhythmic Gymnasts and Choreography Students. Journal of Medical and Biological Research, 2021, vol. 9, no. 2, pp. 115–125. DOI: 10.37482/2687-1491-Z049

Effect Of Neuromuscular Electrical Stimulation On Peak Torque Knee Joint

2014 ◽  
Vol 46 ◽  
pp. 671
Author(s):  
Flávia Medeiros ◽  
Amilton Vieira ◽  
Martim Bottaro ◽  
João Durigan
Keyword(s):  
Electrical Stimulation ◽  
Knee Joint ◽  
Neuromuscular Electrical Stimulation ◽  
Peak Torque

scholarly journals ISOKINETIC PROFILES AND REFERENCE VALUES OF PROFESSIONAL SOCCER PLAYERS

2021 ◽  
Vol 27 (6) ◽  
pp. 610-615
Author(s):  
Guillermo Charneco Salguero ◽  
Francisco García-Muro San José ◽  
Arturo Pérez Gosalvez ◽  
Jose Miguel Cárdenas Rebollo ◽  
Isabel Brígido Fernández ◽  
...  
Keyword(s):  
Reference Values ◽  
Health Professionals ◽  
High Speed ◽  
Peak Torque ◽  
Soccer Players ◽  
Level Of Evidence ◽  
Warm Up ◽  
Professional Soccer ◽  
Average Work ◽  
Torque Values

ABSTRACT Introduction: Isokinetics is a tool commonly used in professional soccer. There is ongoing debate among researchers as to the isokinetic reference values a player should have. Objectives: To determine the absolute peak torque (PT) and average work of professional soccer players in relation to their positions on the field, and to establish the reference values for these variables. Methods: Purposeful sampling was used to select 289 professional soccer players. The sample included 32 goalkeepers, 100 defenders, 98 midfielders, and 59 strikers. The participants were measured preseason. The players were asked to perform a 10-minute warm-up on an exercise bike, and then to perform 5 repetitions at low speed, 10 at medium speed, and 25 at high speed, with 30 to 40-s of rest between each set of repetitions. The contraction method was concentric-concentric in a dynamometer Isomed 2000. Results: The average age, weight, and height of the players was 21.9 years, 74.3 kilograms, and 1.8 meters, respectively. The goalkeepers presented higher PT at the 3 measured speeds, and the higher average work at 180°/s and 240°/s in relation to defenders and midfielders. The strikers presented higher average work at 240°/s in relation to midfielders, and higher PT in relation to the defenders and midfielders. Absolute values were shown and reference values were established. Conclusions: The goalkeepers and strikers were the players that showed the greatest differences in their favor in relation to the other positions. The peak torque values and average work were described in relation to the player's position on the field. This study resulted in the creation of a tool for health professionals working with professional soccer players, providing reference values for these players in relation to their position on the field that can be used as benchmarks, by health professionals, to optimize soccer players’ performance. Level of evidence II, Prospective comparative study.

scholarly journals An ANN-GA Framework for Optimal Engine Modeling

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Khaldoun K. Tahboub ◽  
Mahmoud Barghash ◽  
Mazen Arafeh ◽  
Osama Ghazal
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Optimization Technique ◽  
Peak Torque ◽  
Computational Time ◽  
Optimal Power ◽  
Power Setting ◽  
Optimal Setting ◽  
Artificial Neural Network Ann ◽  
Variable Valve

Internal combustion engines are a main power source for vehicles. Improving the engine power is important which involved optimizing combustion timing and quantity of fuel. Variable valve timing (VVT) can be used in this respect to increase peak torque and power. In this work Artificial Neural Network (ANN) is used to model the effect of the VVT on the power and genetic algorithm (GA) as an optimization technique to find the optimal power setting. The same proposed technique can be used to improve fuel economy or a balanced combination of both fuel and power. Based on the findings of this work, it was noticed that the VVT setting is more important at high speed. It was also noticed that optimal power can be obtained by changing the VVT settings as a function of speed. Also to reduce computational time in obtaining the optimal VVT setting, an ANN was successfully used to model the optimal setting as a function of speed.

The Comparison Study between Isotonic Maximum Strength(IRM) and Isokinetic Peak Torque at the Knee Joint

2002 ◽  
Vol 18 ◽  
pp. 1009-1016
Author(s):  
Sung Soo Kim ◽  
Jae Hyun Yoo ◽  
Yong Suk Jee ◽  
Kwang Wook Yoo ◽  
Young Je Sim ◽  
...  
Keyword(s):  
Knee Joint ◽  
Peak Torque ◽  
Maximum Strength ◽  
Comparison Study ◽  
Isokinetic Peak Torque

CHANGES IN THE FLEXOR AND EXTENSOR MUSCLES AT DIFFERENT SPEEDS

2021 ◽  
Vol 27 (7) ◽  
pp. 686-688
Author(s):  
Rui Ma ◽  
Wenyan Li
Keyword(s):  
Knee Joint ◽  
Peak Torque ◽  
Muscle Group ◽  
Lower Limbs ◽  
Flexor Muscle ◽  
Level Of Evidence ◽  
Isokinetic Test ◽  
Extensor Muscles ◽  
Test Velocity ◽  
The Difference

ABSTRACT Introduction: Centrifugal strength is an important element for strength quality. Developing muscle centrifugal strength can effectively increase the stability of lower limbs and reduce the risk of injury. Objective: To explore the characteristics of contractile force of flexor ahods in strength training and rehabilitation training, and the extensor muscles of the knee joint in athletes with different speeds of centripetal force. Methods: The knee joint muscle group of 8 first-level male high jumpers and 8 second-level male high jumpers were tested by isokinetic centrifugal contraction; the angular test velocity was 60 °/s, 120 °/s, 240 °/s, and the indexes included peak torque, relative peak torque (peak torque/body weight), and the peak torque flexural extension ratio. Results: With the centrifugal contraction of the knee joint muscle group (P < 0.05), the second-level high jumpers should increase the ability of the knee flexor muscle group of the take-off leg. In the case of constant velocity centrifugal contraction (P < 0.01), taking off time must be reduced, that is, taking off speed must be accelerated. Conclusions: The difference in the knee joint muscle isokinetic test results is one of the reasons for the difference in knee joint flexor and extensor muscle contractility under the different speed forces of high jumpers. Level of evidence II; Therapeutic studies - investigation of treatment results.

scholarly journals Relationships between Body Build and Knee Joint Flexor and Extensor Torque of Polish First-Division Soccer Players

2020 ◽  
Vol 10 (3) ◽  
pp. 783 ◽  
Author(s):  
Jadwiga Pietraszewska ◽  
Artur Struzik ◽  
Anna Burdukiewicz ◽  
Aleksandra Stachoń ◽  
Bogdan Pietraszewski
Keyword(s):  
Knee Joint ◽  
Body Mass ◽  
Body Height ◽  
Peak Torque ◽  
Body Part ◽  
Skinfold Thickness ◽  
Joint Torque ◽  
Soccer Players ◽  
Lower Limb Muscles ◽  
Extensor Torque

The aim of the study is to identify the relationships between anthropometric variables and knee joint extensor peak torque, knee joint flexor peak torque, and conventional hamstring-to-quadriceps ratio in Polish first-division soccer players. The study examined 37 soccer players aged 19 to 30 years (body mass: 76.8 ± 7.2 kg, body height 1.82 ± 0.06 m). Muscle torques of the knee joint were measured under isometric conditions using a Biodex 4 Pro dynamometer. The anthropometric variables such as body part lengths, breadths, and girths and skinfold thickness were measured. The strongest relationships of knee joint extensors were observed with body mass and variables describing skeleton size and lower-limb muscles. Regarding knee flexor torque, a significant relationship was found only with body mass. However, no significant relationships were observed between the conventional hamstring-to-quadriceps ratio and the anthropometric variables studied. The regression analysis results identified body height, body mass, and thigh and calf girth as the features most associated with knee joint torque. However, anthropometric measurements do not provide full information about the torque proportions of antagonist muscle groups, which is very important for injury prevention. Therefore, measurements using special biomechanical equipment are also necessary for the comprehensive analyses and control of the effects of sports training.

scholarly journals Trapezoidal Motion Profile to Suppress Residual Vibration of Flexible Object Moved by Robot

Electronics ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 30 ◽  
Author(s):  
Hyun Joong Yoon ◽  
Seong Youb Chung ◽  
Han Sol Kang ◽  
Myun Joong Hwang
Keyword(s):  
High Speed ◽  
Robot Manipulator ◽  
Control Algorithms ◽  
Residual Vibration ◽  
Motion Characteristic ◽  
The Relationship ◽  
Being Moved ◽  
Additional Feedback ◽  
Motion Profile ◽  
Deceleration Time

The residual vibration when a robot manipulator is operated at high speed needs to be suppressed. These vibrations are generated by the resonance of a flexible object being moved by the robot, and research on control algorithms and motion profiles is ongoing to reduce them. In this paper, we propose a method to reduce the residual vibration of an object moved by a robot manipulator by optimizing the acceleration/deceleration time calculated using the object’s natural frequency. The relationship between acceleration/deceleration time and the residual vibration in a trapezoidal velocity profile is considered by analyzing the scenario when the jerking motion characteristic of such vibrations occurs. The results of experiments using a commercial robot show that residual vibrations can be reduced by the proposed method without the need for an additional feedback control algorithm while transferring a flexible object over small and large distances.

scholarly journals A Dynamic Time Warping Based Algorithm to Evaluate Kinect-Enabled Home-Based Physical Rehabilitation Exercises for Older People

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2882 ◽  
Author(s):  
Xiaoqun Yu ◽  
Shuping Xiong
Keyword(s):  
Older People ◽  
Dynamic Time Warping ◽  
Tai Chi ◽  
Physical Rehabilitation ◽  
Training Data ◽  
Time Warping ◽  
Home Based ◽  
Gaming Environment ◽  
Dynamic Time ◽  
Rehabilitation Exercises

Older people face difficulty engaging in conventional rehabilitation exercises for improving physical functions over a long time period due to the passive nature of the conventional exercise, inconvenience, and cost. This study aims to develop and validate a dynamic time warping (DTW) based algorithm for assessing Kinect-enabled home-based physical rehabilitation exercises, in order to support auto-coaching in a virtual gaming environment. A DTW-based algorithm was first applied to compute motion similarity between two time series from an individual user and a virtual coach. We chose eight bone vectors of the human skeleton and body orientation as the input features and proposed a simple but innovative method to further convert the DTW distance to a meaningful performance score in terms of the percentage (0–100%), without training data and experience of experts. The effectiveness of the proposed algorithm was validated through a follow-up experiment with 21 subjects when playing a Tai Chi exergame. Results showed that the algorithm scores had a strong positive linear relationship (r = 0.86) with experts’ ratings and the calibrated algorithm scores were comparable to the gold standard. These findings suggested that the DTW-based algorithm could be effectively used for automatic performance evaluation of an individual when performing home-based rehabilitation exercises.

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