Identifying Faults In Javelin Throwing Technique Using Computer Vision

Richards, Zaavan; Gaynor, Paul

doi:10.1109/southeastcon48659.2022.9764130

Cited by 3 publications

(4 citation statements)

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“…To accentuate the braking effect, coaches in javelin have emphasised the front leg plant to the extent that it is known as the ‘block’: an implication that the larger the plant angle relative to the line of progression (Figure 4), the larger the braking forces that can be applied through the front foot. 34 This study indicates that this technique similarly applies in pace bowling. There was a strong positive correlation found between the plant angle and the maximum braking GRF (Table 2).…”

Section: Discussionmentioning

confidence: 61%

Investigating the biomechanical validity of the V-spine angle technique in cricket fast bowling

Ferdinands

Singh

2022

International Journal of Sports Science & Coaching

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The effective utilisation of braking ground reaction forces is considered an essential biomechanical characteristic of fast bowling in cricket. The configuration of the trunk and legs during the delivery stride phase has been hypothesised to increase braking forces, causing the upper body segments to increase their angular momentum and thereby increase ball release speed. This study investigated the relationship between V-spine angle, front shank angle (plant angle) and front knee angle with braking ground reaction forces and ball release speed. Three-dimensional kinematic and kinetic analyses were performed for 17 male pace bowlers (17.2 ± 1.7 years) of New South Wales grade club level using data from a Cortex 2.0 motion analysis system (200 Hz) and Kistler force plates (1000 Hz). V-spine angle was strongly and significantly correlated with braking ground reaction force (r = −0.691), plant angle (r = −0.806) and front knee angle (r = −0.606). In addition, stepwise multiple linear regression analysis revealed that front shank angle was the strongest predictor of braking ground reaction force. The data suggests that V-spine angle and plant angle may play an important role in generating high braking ground reaction forces in bowling, with the front knee angle possibly playing a supporting role. Coaches may need to consider these findings when assessing the techniques of pace bowlers.

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Section: Discussionmentioning

confidence: 61%

Investigating the biomechanical validity of the V-spine angle technique in cricket fast bowling

Ferdinands

Singh

2022

International Journal of Sports Science & Coaching

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“…The issue is further clouded because in some athletic literature the braced action of the front leg is referred to as the “block”. 13 From a biomechanics perspective, it seems unlikely that a flexed elbow into the side of the body can perform any significant type of “blocking” or deceleration of a major segment's rotation. A more plausible explanation is that the active front-elbow flexion minimises the moment of inertia about the trunk rotation, flexion, and lateral bending axes to facilitate an increase in the angular velocity of the trunk segment.…”

Section: Discussionmentioning

confidence: 99%

“…In the coaching literature, the term “block” may correspond with this constrained action of the front arm, but there is no uniformity in the explanation of its biomechanical function. 12,13…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the front-arm technique in cricket fast bowling

Ferdinands

Deshpande²

2022

International Journal of Sports Science & Coaching

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The aim of this study was to investigate the kinetics of the front arm in cricket fast bowling. Eighteen male fast bowlers (mean age = 17.2 ± 1.6 years; mean height = 1.89 ± 0.05 m; mean mass = 85.0 ± 10.0 kg) were recruited from NSW grade club level and their bowling actions recorded by a Cortex 2.0 motion analysis system (200 Hz). The interaction between joint power and joint angular velocity data was observed simultaneously for the front shoulder and elbow joints. A joint actuation strategy (active or controlled) was assigned to shoulder flexion–extension, abduction–adduction, and elbow flexion–extension motion to understand whether the joint kinematics followed the time-history of the joint torque. The results only partially agreed with the commonly prescribed coaching maxim of “pulling down” the front arm for faster ball speeds. Active extension and adduction of the front shoulder joint were observed during the delivery phase of the action, whereas the acceleration phase was marked by periods of controlled shoulder extension and active shoulder flexion. At the elbow joint, active elbow flexion was observed at a time when it may reduce the moment of inertia about the thoracic and lumbar spine rotation axes. Overall, combinations of active and controlled joint powers were observed for the front shoulder and elbow joints, implying that this sample of bowlers did not adhere to the traditional notion of “pulling down” the front arm as fast as possible.

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“…Computer vision technology has provided coaches with a new training tool. (2) Because machine vision has more precision and memory than the human eye, it can catch motion targets rapidly and record various motion data of the targets, and these motion data give a more understandable picture of athletes' excellent or poor actions. Because the movement of sports targets in sports videos is quick and frequently varies significantly, generic motion models struggle to forecast the precise location of sports targets.…”

Section: Introductionmentioning

confidence: 99%

SeaVit: Sports Event Athletes Tracking Model Design

Yuan,

Liu,

Feng

2024

Sensors and Materials

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In recent years, the rapid development of the sports industry has led to increasing attention on complex sports scenes such as basketball and soccer. One of the challenges in these scenes is tracking athletes in motion. To address this issue, we used a large dataset of images captured by a perception visual system as our training data. In this paper, we focus on tracking athletes in complex sports scenes such as basketball and soccer, and propose a tracking model that incorporates a target search attention mechanism and integrates saliency heat maps for feature extraction and target information integration. Our proposed SeaVit method significantly improves tracking performance compared with existing discriminative correlation filter (DCFbased) techniques. Our experimental results demonstrate that our method outperforms existing methods in both precision and real-time performance. With an average distance precision (DP) of 80.5, our proposed tracker outperforms other trackers, achieving the highest DP value. Our study has broad practical applications. In the future, our method can be embedded in visual sensors and applied to athlete training, which helps to improve the effectiveness of athlete training and competition performance.

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Identifying Faults In Javelin Throwing Technique Using Computer Vision

Cited by 3 publications

References 4 publications

Investigating the biomechanical validity of the V-spine angle technique in cricket fast bowling

Investigating the biomechanical validity of the V-spine angle technique in cricket fast bowling

Kinetics of the front-arm technique in cricket fast bowling

SeaVit: Sports Event Athletes Tracking Model Design

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