The relationship between certain kinematic variables, specific coordination skills, and the accuracy of the underhand reception in volleyball

The research aimed to examine kinematic variables and their relationship with accuracy during the execution of the underhand reception skill in volleyball.

• Identify the values of some kinematic variables of the underhand reception skill,


• Determine the accuracy scores of the technical performance of the underhand reception skill in volleyball.


• Identify the values of specific coordinative abilities (under study).


• Finally, to examine the relationship between accuracy values and certain kinematic variables of the underhand reception skill, as well as the connection between some kinematic variables and specific coordinative abilities — specifically the ability to respond quickly and to adapt to changing situations — in the technical performance of the underhand reception skill among volleyball players.

Methodology

The researcher used a descriptive correlational approach. The sample was deliberately chosen from players of Al-Shamal Refinery Club, who competed in the Iraqi Volleyball Premier League during the 2022–2023 season.

To collect data, the researcher used various tools, including:

• Scientific sources and references,


• Personal interviews,


• Questionnaires,


• Tests,


• Measurements,


• And scientific technical observation.

The research sample was recorded using two cameras:

1. The first camera, CASIO EX-FH25 EXILM digital, with a speed of 300 frames per second, was placed 5.44 meters from the center of the circle drawn in the middle of the court, perpendicular to the left side of the player's body, at a height of 1.28 meters from the ground to focus the lens.


2. The second device was an iPhone 12 Pro Max, recording at 240 frames per second, placed 4.80 meters from the center of the circle, perpendicular to the right side of the player's body, and at a height of 1.28 meters from the lens focus.

A 1-meter-long scale was used and filmed both horizontally and vertically at the center of motion before the experiment started to ensure measurement accuracy.

The statistical methods employed included:

• Percentages,


• The mean,


• Standard deviation,


• Coefficient of variation,


• And Pearson’s straightforward correlation coefficient.

Findings

There was variation in the achievement of coordinative abilities in their significant correlations with kinematic variables during the execution of the underhand reception skill.