Clinical Research Directory

The full intervention program will cover 12 weeks in the season. Prior to training, players will be instructed to warm-up for ten minutes with general running exercises and dynamic stretching. The plyometric training intervention will consist of 5 exercises performed in the following order: Leap forward and backward on the line, leap sideways on the line, double leg knee to chest, split squat jump, and squat jump (Bavli, 2012). A volleyball coach will monitor the whole training.

The entire intervention program will last for 12 weeks during the season. Before training, players will be instructed to warm up with general running exercises and dynamic stretching for ten minutes. The jump rope intervention will consist of 5 exercises performed in the following order: basic jump step, double leg double jump, double leg jump left and right, double leg jump forward and backward, and scissor steps (Trecroci et al., 2015). Each exercise will be performed by all participants using a jump rope with the same characteristics in terms of weight (e.g. 230g), length (e.g. shoulder size) and material (e.g. PVC, Polyvinyl Chloride). A metronome speed of 120 beats per minute will be used to ensure equal exercise intensity in both exercise programs Furthermore, a volleyball coach will monitor the entire workout.

More complex, skill-based conditioning exercises for volleyball are small-sided games (2v2, 3v3) and competition drills (6v6). Although the duration of each rally in these drills is not controlled by the coach, the total duration of the drill will be recorded to aid in-session and inter-session planning. Total repetitions will be easily measured by adding up the total points played in the rally and then multiplying by the number of rallies per point. The coach will create an emotionally intense environment by applying a scoring system (e.g. team winning 2 out of 3 rallies gets 1 big point, 5 seconds rest) and encouraging the players (Trajkovic et al., 2012).