Direct and indirect effects of joint torque inputs during an induced speed analysis of a swinging motion

Koike, Sekiya; Ishikawa, Tatsuya; Willmott, Alexander P.; Bezodis, Neil E.

doi:10.1016/j.jbiomech.2019.01.032

Cited by 10 publications

(3 citation statements)

References 34 publications

(46 reference statements)

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“…The racket model (two rigid segments connected by a virtual joint) is a simplification of the dynamic behaviour of a racket, which adopts an infinite number of mode shapes under loading; however, the current approach has been used previously to measure racket kinematics [15]. Future work should also aim to understand the direct vs. indirect effects of the torques within the smash with respect to the generation of speed [28], i.e., whether the high speeds generated are a result of instantaneous torques produced by the musculature at the joint or developed by cumulative torques from prior torques at other joints. The 'resultant moments' approach used in this study does not allow a distinction between muscular, gravitational and velocity-dependent torques and therefore specific recommendations for strengthening specific muscle groups should be made with caution.…”

Section: Discussionmentioning

confidence: 99%

Relationships between Racket Arm Joint Moments and Racket Head Speed during the Badminton Jump Smash Performed by Elite Male Malaysian Players

et al. 2022

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Three-dimensional position data of nineteen elite male Malaysian badminton players performing a series of maximal jump smashes were collected using a motion capture system. A ‘resultant moments’ inverse dynamics analysis was performed on the racket arm joints (shoulder, elbow and wrist). Relationships between racket head speed and peak joint moments were quantified using correlational analyses, inclusive of a Benjamini–Hochberg correction for multiple-hypothesis testing. The racket head centre speed at racket–shuttlecock contact was, on average, 61.2 m/s with a peak of 68.5 m/s which equated to average shuttlecock speeds of 95.2 m/s with a peak of 105.0 m/s. The correlational analysis revealed that a larger shoulder internal rotation moment (r = 0.737), backwards shoulder plane of elevation moment (r = 0.614) and wrist extension moment (r = −0.564) were associated with greater racket head centre speed at racket–shuttlecock contact. Coaches should consider strengthening the musculature associated with shoulder internal rotation, plane of elevation and wrist extension. This work provides a unique analysis of the joint moments of the racket arm during the badminton jump smash performed by an elite population and highlights significant relationships between racket head speed and peak resultant joint moments.

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Section: Discussionmentioning

confidence: 99%

Relationships between Racket Arm Joint Moments and Racket Head Speed during the Badminton Jump Smash Performed by Elite Male Malaysian Players

et al. 2022

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“…The rigid link model and the locations of the IMUs attached to the segments are shown in Figure 1a,b. Anatomical constraint axes (e.g., varus/valgus axis at the elbow joint; internal/external rotation axis at the wrist joint), along which the joints could not rotate freely, were considered [6]. Since the ball was assumed to be fixed to the hand segment coordinate system during the pitching motion, the hand and ball were assumed to be one rigid segment in this study.…”

Section: Dynamical Model Of Upper Limb Segments With a Ballmentioning

confidence: 99%

Quantification of a Ball-Speed Generating Mechanism of Baseball Pitching Using IMUs

Koike

Tazawa²

2020

The 13th Conference of the International Sports Engineering Association

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The purpose of this study was to propose a methodology which quantifies the ball-speed generating mechanism of baseball pitching with the use of inertial measurement units (IMUs). IMUs were attached to the upper trunk, upper arm, forearm, and hand segments. The initial orientation parameters of each segment were identified using the differential iteration method from the acceleration and angular velocity of the sensor coordinate system output by IMUs attached to each segment. The motion of each segment was calculated and the dynamic contributions were then calculated. The motion of a baseball pitcher, who was instructed to throw at the target, was measured with a motion capture (mocap) system and IMUs. The results show that quantitative analysis of the ball-speed generation mechanism by the proposed method is almost similar to that conducted by the mocap system. In the future, this method will be employed to evaluate the ball-speed generation mechanism outside controlled laboratory conditions in an effort to help understand and improve the player’s motion.

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“…Koike proposed an equation of motion consisting of a joint torque term, a gravitational term, and a motion-dependent term consisting of centrifugal forces and Coriolis forces. It was shown that the contribution of each term greatly differs depending on which exercise is focused (Koike et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A study on derivation method of motion feature points in sports motion analysis for racket matching

Sekine

Takehara

Kawano

et al. 2020

JBSE

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In this study, as part of efforts to assist beginners in sports such as tennis and badminton in selecting the most suitable equipment, an index for objectively evaluating such equipment is proposed. To accomplish this, standard swing trajectory variations are used to create an index from the viewpoint of human motion control. We begin by noting that human body data gained via motion capture are large in number because of the wide variety of equipment types used and due to the significant diversity of human body characteristics. Hence, even though motion capture devices are often used to capture swing motions, the most suitable human body segments for use in equipment evaluations have not yet been clarified. To facilitate this, it is necessary to reduce the overall number of body segments under consideration. In this paper, the method of deriving the feature points in sports motion was examined. More specifically, in order to obtain fundamental findings, tennis stroke and badminton smash motions are used as representative movements, and experiments using a motion capture device are performed. In the motion analysis that follows, we then investigate which markers can most clearly express the relationship between the racket and the human body in order to capture stroke motion characteristics. Then, an index of contribution is adapted to tennis swing and badminton smash motions, the motion feature points in the stroke and smash motion are derived, and the significant markers for motion analysis are identified and discussed.

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Direct and indirect effects of joint torque inputs during an induced speed analysis of a swinging motion

Cited by 10 publications

References 34 publications

Relationships between Racket Arm Joint Moments and Racket Head Speed during the Badminton Jump Smash Performed by Elite Male Malaysian Players

Relationships between Racket Arm Joint Moments and Racket Head Speed during the Badminton Jump Smash Performed by Elite Male Malaysian Players

Quantification of a Ball-Speed Generating Mechanism of Baseball Pitching Using IMUs

A study on derivation method of motion feature points in sports motion analysis for racket matching

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