A KINEMATIC COMPARISON OF CONVENTIONAL INSWING AND OUTSWING BOWLING IN CRICKET

Swing bowling is an important facet of cricket, however, it has received little consideration from researchers. This study compared the bowling action and initial ball flight kinematics of inswing and outswing deliveries in 15 (male = 12, female = 3) pathway and high-performance medium and fast pace bowlers. Participants delivered the ball with their forearm, hand and the seam of the ball angled towards and away from the batter for inswing and outswing with an extended wrist flexing at ball release. Therefore, significant differences were found in forearm orientation (p \u3c 0.001), hand orientation (p \u3c 0.001), seam azimuth angle (p \u3c 0.001) and swing angle (p \u3c 0.001). By identifying similarities and differences of inswing and outswing, this study could benefit coaches to improve swing bowling performance in bowlers and provide a foundation for future research

ILLEGAL BOWLING ACTIONS LAWS, DO THEY REALLY MATTER?

The purpose of this study was to compare performance variables and upper body kinematics between cohorts of pathway (illegal and legal action) and elite level (legal) finger-spin (FS) bowlers. Results indicated that pathway illegal bowlers place significantly more revolutions on the ball compared with bowlers of the same level, reflecting that of the higher elite level bowlers. These differences are driven by various upper body kinematic differences at the trunk, elbow and wrist. This research highlights that when bowling with an illegal action, a possible performance benefit exists, reinforcing the current illegal action laws (the law does matter)

ISBS 2021 CONFERENCE PROCEEDINGS TITLE AND FOREWARD

The ISBS is an international society totally dedicated to biomechanics in sports, whose primary purposes are: To provide a forum for the exchange of ideas for sports biomechanics researchers, coaches and teachers. To bridge the gap between researchers and practitioners. To gather and disseminate information and materials on biomechanics in sports. The conference planned for Canberra, Australia did not go ahead in a face-to-face capacity due to COVID-19. The conference was instead delivered fully online. These proceedings are the accepted papers for the online conference. Papers underwent a double blinded review process. Each paper in these proceedings has been reviewed by at least two members of the scientific committee. The scientific committee comprises the current members of the board of directors of the ISBS and the keynote speakers for the upcoming conference

An analysis of lower limb coordination variability in unilateral tasks in healthy adults: a possible prognostic tool

Interlimb coordination variability analysis can shed light into the dynamics of higher order coordination and motor control. However, it is not clear how the interlimb coordination of people with no known injuries change in similar activities with increasing difficulty. This study aimed to ascertain if the interlimb coordination variability range and patterns of healthy participants change in different unilateral functional tasks with increasing complexity and whether leg dominance affects the interlimb coordination variability. In this cross-sectional study fourteen younger participants with no known injuries completed three repeated unilateral sit-to-stands (UniSTS), step-ups (SUs), and continuous-hops (Hops). Using four inertial sensors mounted on the lower legs and thighs, angular rotation of thighs and shanks were recorded. Using Hilbert transform, the phase angle of each segment and then the continuous relative phase (CRP) of the two segments were measured. The CRP is indicative of the interlimb coordination. Finally, the linear and the nonlinear shank-thigh coordination variability of each participant in each task was calculated. The results show that the linear shank-thigh coordination variability was significantly smaller in the SUs compared to both UniSTS and Hops in both legs. There were no significant differences found between the latter two tests in their linear coordination variability. However, Hops were found to have significantly larger nonlinear shank-thigh coordination variability compared to the SUs and the UniSTS. This can be due to larger vertical and horizontal forces required for the task and can reveal inadequate motor control during the movement. The combination of nonlinear and linear interlimb coordination variability can provide more insight into human movement as they measure different aspects of coordination variability. It was also seen that leg dominance does not affect the lower limb coordination variability in participants with no known injuries. The results should be tested in participants recovering from lower limb injuries

JOINT DISPLACEMENTS AND PEAK ACHILLES TENDON FORCE DURING IRISH DANCING-SPECIFIC LANDING TASKS

Achilles tendinopathy is prevalent among Irish dancers, thought to be due to the high impact, stiff-style landing tasks associated with the sport. This study aimed to investigate the relationship between sagittal plane joint displacements, at the ankle, knee, hip and thorax segment, and peak Achilles tendon force during an Irish dancing ‘leap over’ landing task. Kinetic and kinematic data were collected for 12 participants performing the ‘leap over’, and used to calculate peak Achilles tendon force and joint displacements. Results of the study found a statistically significant positive correlation between ankle dorsiflexion and peak Achilles tendon force during the ‘leap over’. These findings can be used to inform future research into the effect of joint displacement on peak Achilles tendon force, and to develop strategies to help dancers reduce their risk of developing Achilles tendinopathy