scholarly journals Assessment of the Relationship between Y-Balance Test and Stabilometric Parameters in Youth Footballers

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Damian Sikora ◽  
Małgorzata Pałac ◽  
Andrzej Myśliwiec ◽  
Tomasz Wolny ◽  
Paweł Linek
Keyword(s):  
Path Length ◽  
Dynamic Balance ◽  
Dynamic Test ◽  
Lower Limbs ◽  
Test Results ◽  
Dynamic Tests ◽  
Balance Test ◽  
Time Required ◽  
The Right ◽  
The Relationship

Objectives. The purpose of the study was to evaluate the correlation between dynamic test results obtained on a stabilometric platform and the results achieved on the Y-balance test (Y-BT). Method. The study group consisted of 52 adolescent athletes, aged 14 to 17 years. Each participant was evaluated in the scope of their ability to maintain dynamic balance using the Y-BT as well as via dynamic tests on the ‘Alfa’ stabilometric platform. The following parameters were analysed: (a) from the Y-BT—relative reach of the right and left lower limbs in the anterior, posterolateral, and posteromedial directions, as well as the side-to side difference in relative reach for each direction and (b) from the ‘Alfa’ platform—path length and time to reach the target using right and left lower limbs in the anterior and posterior directions. Results. A correlation between the results obtained on the stabilometric platform and the Y-BT was found only for the posteromedial direction. Statistical analysis demonstrated that the increased difference between the right and left lower limbs in the posteromedial test is related to an increase in time taken to reach the points located forward and to the left, and backwards and to the right, as well as an increase in the overall time required to complete the task on the stabilometric platform. Conclusions. The results from the Y-BT and stabilometric platform are weakly related in adolescents. These findings indicate that the Y-BT and stabilometric platform analyse different kinds of dynamic balance in adolescents. Thus, these tools should not be used interchangeably in clinical practice or scientific research.

scholarly journals The Relationship between Dynamic Balance and Jumping Tests among Adolescent Amateur Rugby Players. A Preliminary Study

2021 ◽  
Vol 18 (1) ◽  
pp. 312
Author(s):  
Bartosz Wilczyński ◽  
Jakub Hinca ◽  
Daniel Ślęzak ◽  
Katarzyna Zorena
Keyword(s):  
Injury Risk ◽  
Dynamic Balance ◽  
Study Data ◽  
Balance Test ◽  
Risk Of Injury ◽  
Counter Movement Jump ◽  
Increased Risk ◽  
Positive Correlations ◽  
The Relationship ◽  
Rugby Players

Rugby is a demanding contact sport. In light of research, poor balance, reduced jumping ability, muscle strength, and incorrect landing patterns might contribute to the increased risk of injury in athletes. Investigating the relationship between tests assessing these abilities might not only allow for the skillful programming of preventive training but also helps in assessing the risk of injury to athletes. Thus, the main purpose of this study was to investigate the relationship between dynamic balance, vertical and horizontal jumps, and jump-landings movement patterns. Thirty-one healthy amateur adolescent rugby players (age: 14.3 ± 1.6 years, height 171.4 ± 9.7 cm, body mass 80 ± 26 kg) participated in the study. Data were collected by the Y-balance Test (YBT), Counter Movement Jump (CMJ), Single Leg Hop for Distance (SLHD), and Landing Error Score System (LESS). Significant positive correlations were found between SLHD both legs (SLHDb) and YBT Composite both legs (COMb) (r = 0.51, p = 0.0037) and between SLHDb and CMJ (r = 0.72, p < 0.0001). A relationship was also observed between the CMJ and YBT COMb test (r = 0.51, p = 0.006). Moderate positive correlations were found between the dominant legs in SLHD and the posterolateral (r = 0.40, p = 0.027), posteromedial (r = 0.43, p = 0.014), and composite (r = 0.48, p = 0.006) directions of the YBT. These results indicate that variables that are dependent on each other can support in the assessment of injury-risk and in enhancing sports performance of young athletes.

scholarly journals Laterality of the legs in young female soccer players

2015 ◽  
Vol 16 (4) ◽  
Author(s):  
Katarzyna Z. Antosiak-Cyrak ◽  
Grzegorz Wiczyński ◽  
Elżbieta M. Rostkowska
Keyword(s):  
Young Female ◽  
Lower Limbs ◽  
Soccer Players ◽  
Static Balance ◽  
Balance Test ◽  
Body Balance ◽  
Hop Tests ◽  
Global Movements ◽  
The Right ◽  
Better Than

AbstractPurpose. The aim of the present study was assessment of laterality of the legs of young female soccer players and their non-training counterparts. Methods. The study sample comprised 9 female soccer players and 19 non-training girls. They underwent three measurement sessions, one every six months. The applied tests included kinesthetic differentiation, rate of local movements, static balance, single-leg hop, rate of global movements, strength and speed, and functional asymmetry of the legs tests. Results. The soccer players were better than the controls in their performance of the rate of local movements, rate of global movements, kinesthetic differentiation, single-leg 15m timed hop and static balance tests. Smaller differences between the results of the left and the right legs in soccer players, than in non-training girls, were noted in the rate of local movements, rate of global movements and kinesthetic differentiation tests. In the static balance test, the differences were greater in the group of soccer players. Conclusions. Lateralization of the lower limbs is a highly complex characteristic with a different variability in athletes than in nontraining individuals. The results of the present study also point to the specialization of soccer players’ left legs in body balance and single-leg hop tests.

Association of Ankle Kinematics and Performance on the Y-Balance Test With Inclinometer Measurements on the Weight-Bearing-Lunge Test

2015 ◽  
Vol 24 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Min-Hyeok Kang ◽  
Dong-Kyu Lee ◽  
Kyung-Hee Park ◽  
Jae-Seop Oh
Keyword(s):  
Outcome Measures ◽  
Dynamic Balance ◽  
Weight Bearing ◽  
Ankle Dorsiflexion ◽  
Balance Test ◽  
Cross Sectional ◽  
Tape Measure ◽  
Ankle Kinematics ◽  
And Performance ◽  
The Relationship

Context:Ankle-dorsiflexion range of motion has often been measured in the weight-bearing condition in the clinical setting; however, little is known about the relationship between the weight-bearing-lunge test (WBLT) and both ankle kinematics and performance on dynamic postural-control tests.Objective:To examine whether ankle kinematics and performance on the Lower Quarter Y-Balance Test (YBT-LQ) are correlated with results of the WBLT using an inclinometer and tape measure.Design:Cross-sectional.Setting:University motionanalysis laboratory.Participants:30 physically active participants.Interventions:None.Main Outcome Measures:The WBLT was evaluated using an inclinometer and a tape measure. The reach distances in the anterior, posteromedial, and posterolateral directions on the YBT-LQ were normalized by limb length. Ankle dorsiflexion during the YBT-LQ was recorded using a 3-dimensional motion-analysis system. Simple linear regression was used to examine the relationship between the WBLT results and both ankle dorsiflexion and the normalized reach distance in each direction on the YBT-LQ.Results:The WBLT results were significantly correlated with ankle dorsiflexion in all directions on the YBT-LQ (P < .05). A strong correlation was found between the inclinometer measurement of the WBLT and ankle dorsiflexion (r = .74, r2 = .55), whereas the tape-measure results on the WBLT were moderately correlated with ankle dorsiflexion (r = .64, r2 = .40) during the anterior reach on the YBT-LQ. Only the normalized anterior reach distance was significantly correlated with the results for the inclinometer (r = .68, r2 = .46) and the tape measure (r = .64, r2 = .41) on the WBLT.Conclusions:Inclinometer measurements on the WBLT can be an appropriate tool for predicting the amount of ankle dorsiflexion during the YBT-LQ. Furthermore, WBLT should be measured in those who demonstrate poor dynamic balance.

Model Parameter Identification of Tire Dynamic Balance Detection System

2012 ◽  
Vol 157-158 ◽  
pp. 731-736
Author(s):  
Jing Fang Yang ◽  
Xian Ying Feng ◽  
Hong Jun Fu ◽  
Shi Gang Mu
Keyword(s):  
Parameter Identification ◽  
Detection System ◽  
Dynamic Balance ◽  
Signal Amplitude ◽  
Engineering Practice ◽  
Model Parameters ◽  
Test Results ◽  
Process Data ◽  
Validation Experiment ◽  
The Right

Tire dynamic balance detection plays an important part in tire quality detection area. An accurate model structure and precise model parameters are the basis of the right test results. This paper builds a kinetic model based on engineering practice. To acquire parameters presents a method following identification theory. According to the need of actual production, a validation experiment is put forward. In the parameter identification process, data acquisition is completed by the PCI card. For data processing, this paper designs the fitting filter and then it also fetches the signal amplitude and phase with discrete Fourier transform. The results are proven to be right and practicable.

scholarly journals Instantaneous Approach for Evaluating the Initial Centers in the Agricultural Databases Using K-Means Clustering Algorithm

2021 ◽  
Author(s):  
LNC. Prakash K ◽  
G. Surya Narayana ◽  
Mohd Dilshad Ansari ◽  
Vinit Kumar Gunjan
Keyword(s):  
Clustering Algorithm ◽  
Clustering Algorithms ◽  
Test Results ◽  
Data Segmentation ◽  
New Strategy ◽  
Time Required ◽  
Experimental Findings ◽  
The Right ◽  
The Given ◽  
Original Cluster

Clustering algorithms are most probably and widely used analysis method for grouping agricultural data with high similarity. For example, one of the most widely used approaches in previous study is K-means, which is simpler, more versatile, and easier to understand and formulate. The only disadvantage of the K-means algorithm has always been that the predetermined set of cluster centres must be prepared ahead of time and provided as feedback. This paper addresses the issue of estimating cluster random centres for data segmentation and proposes a new method for locating appropriate random centres based on the frequency of attribute values. As a consequence of calculating cluster random centres, the number of iterations required to achieve optimum clusters in K-means will be reduced, as will the time required to shape the final clusters. The experimental findings show that our approach is efficient at estimating the right random cluster centres that indicate a fair separation of objects in the given database. The technique observation and comparative test results showed that the new strategy does not use present manual cluster centres, is more efficient in determining the original cluster centres, and therefore more successful in terms of time to converge the actual clusters especially in agricultural data bases.

scholarly journals Ultrasound Detection of the Aquarium Sign at the Bedside

2020 ◽  
Author(s):  
Mihiro Kaga ◽  
Emi Yamashita ◽  
Takeshi Ueda
Keyword(s):  
Point Of Care ◽  
Point Of Care Ultrasound ◽  
Test Results ◽  
Mesenteric Ischaemia ◽  
Contrast Enhanced ◽  
Life Threatening ◽  
Hepatic Portal ◽  
The Right ◽  
Enhanced Computed Tomography ◽  
The Relationship

Objectives: The aquarium sign is the name given to a large quantity of bubble-like echoes that suggests the presence of hepatic portal venous gas (HPVG). Few studies in the literature have addressed the relationship between the aquarium sign and HPVG. In some cases, HPVG can only be detected using ultrasonography. HPVG can be observed in a variety of conditions, including those that require emergency surgery, such as acute mesenteric ischaemia (AMI). Therefore, it is important to identify the presence of HPVG as soon as possible.  Materials and methods: We report a case of the aquarium sign, where bubble-like echoes flowed from the right atrium towards the right ventricle, which was identified using bedside cardiac ultrasonography as part of a point-of-care ultrasound test. Results: This aquarium sign finding led to the diagnosis of AMI, which was confirmed using contrast-enhanced computed tomography (CT).  Conclusion: The aquarium sign is a useful finding suggestive of HPVG and mesenteric ischaemia, which can be rapidly and easily observed using bedside cardiac ultrasonography. However, there are very few reports on the aquarium sign. The inability of other more cumbersome diagnostic imaging modalities, such as CT and magnetic resonance imaging, to detect HPVG emphasizes the utility and convenience of detecting the aquarium sign using bedside ultrasonography. This technique can lead to early detection of life-threatening diseases as well as improve the prognosis for patients. The diagnostic implications of the aquarium sign for HPVG are still unclear and require further research.

scholarly journals Reliability of Functional Balance Tests and Their Correlation With Selected Anthropometric Parameters in Children Aged 7-10 Years

2020 ◽  
Vol 5 (4) ◽  
pp. 216-227
Author(s):  
Mahboobeh Dehnavi ◽  
◽  
Heidar Sadeghi ◽  
Mehdi Taghva ◽  
◽  
...  
Keyword(s):  
Body Length ◽  
Dynamic Balance ◽  
Static Balance ◽  
Lower Body ◽  
Dynamic Tests ◽  
Anthropometric Parameters ◽  
Balance Test ◽  
Functional Balance ◽  
Balance Tests ◽  
Romberg Test

Objective: The present study aimed to evaluate the reliability of functional balance tests and their correlation with selected anthropometric parameters in children aged 7-10 years. Methods: Participants were 80 students aged 7-10 (40 female and 40 male). Romberg Test and Sharpened Romberg Test were used for assessing static balance, while timed up and go test, tandem walk test, and Y-balance test were used for measuring dynamic balance. Selected anthropometric factors were body height, upper body length, lower body length, Foot length and body mass. Reliability was determined using intra-class correlation coefficient (ICC), and Pearson correlation was used for examining the relationship between balance tests and selected anthropometric parameters at a significance level of P≥0.05. Results: Static balance tests were not reliable, but dynamic tests were reliable. No significant correlation was found between anthropometric parameters and static and dynamic tests (P>0.05); except between lower body length and Y-balance test (r=0.53, P=0.01). Conclusion: It seems that at the age of 7-10 years, static balance tests are affected because the sensory systems related to balance are developing. Therefore, static balance tests, which require weighting of each of these systems with eyes closed and open, are not good criteria for examining the balance of this age group. Hence, it is better to use dynamic balance tests, especially the Y-balance test.

Correlations between Gun-Barrels Temperature Rising and Shooting Specifications

2015 ◽  
Vol 775 ◽  
pp. 115-118 ◽  
Author(s):  
Yong Hai Shan ◽  
Zheng Gang Nie ◽  
Shi Qi Shan ◽  
Li Dong Tan
Keyword(s):  
Temperature Field ◽  
Temperature Variation ◽  
Field Testing ◽  
Test Results ◽  
Experimental Basis ◽  
Dynamic Tests ◽  
Life Test ◽  
The Relationship ◽  
Temperature Dynamic

Gun barrels life closely related to the gun barrels temperature variation. On the basis of analyzing gun barrels temperature various characteristics and rules during machine-guns firing, according to gun barrels life factors and their impact on gun barrels life, test programs under different shooting combined conditions and gun barrels temperature field testing programs are designed. Through the gun barrels temperature dynamic tests and test results during shooting, analyze and put forward the relationship between gun barrels temperature rising and firing specification. Which provides the experimental basis for choice of machine-gun barrels life stresses and analysis of the life-ended rules.

Dynamics Analysis and Experimental Research on Turbocharger Rotor with Fore and after Lighting Optimization

2011 ◽  
Vol 230-232 ◽  
pp. 1099-1103
Author(s):  
Jun Shen Zhao ◽  
Chao Chen Ma ◽  
Liao Ping Hu
Keyword(s):  
Critical Speed ◽  
Dynamic Balance ◽  
Second Order ◽  
Dynamics Analysis ◽  
Test Results ◽  
Third Order ◽  
Balance Test ◽  
Turbine Wheel ◽  
The Third ◽  
Design Result

The critical speed is analyzed on critical speed of JP60C vehicles turbocharger with DyRoBeS, Based on the optimum design result, the lightening turbine wheel is casted adopting lost wax casting with rapid prototyping technology (RPT). The dynamic balance test is carried out in the TURBO TECHNICS. The calculation and test results show that the second-order critical speed of lightening rotor decreased compared with original turbocharger, and the working speed of turbocharger still between the second-order critical speed and the third-order critical speed.

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