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Completed

NCT Number: NCT06459050

Effects of Isometric Conditioning Activity on Subsequent Jumping Performance in Volleyball Players

The pairing of high-effort exercise, called conditioning activity, with a biomechanically similar high-velocity power movement is considered a valid method to effectively facilitate muscle power adaptations. Research has mainly focused on using this method in exercises performed by both limbs, even though sports tasks are often executed through motion sequences produced by a single limb alternately. However, available studies have focused solely on the dominant leg, leaving it unclear if the effectiveness is similar in both legs and how it transfers between them. Therefore, this study aims to evaluate the immediate effects of the isometric split squat exercise on single-leg drop jump performance in volleyball players, considering their training status.

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Key information

Conditions

Resistance Training Behavior Motor Activity

Age range

18 year–35 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

The Jerzy Kukuczka Academy of Physcial Education in Katowice

Katowice, Silesian Voivodeship, 40-065, Poland

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • no lower-limb serious injury, including tendon or muscle tear,
  • participation in regular resistance training and competition.
  • for the elite group participants competed at the highest national volleyball league for at least two consecutive seasons.
  • for the amateur group participants competed in junior groups outside the highest league level.

Exclusion criteria

-

Treatment and study plan

Dominant Limb Overcoming Isometric Conditioning Activity

Other

Each session involved performing 3 sets of 3-second overcoming isometric split squats with a 3-minute rest between sets as a conditioning activity performed by the dominant limb.

Non-dominant Limb Overcoming Isometric Conditioning Activity

Other

Each session involved performing 3 sets of 3-second overcoming isometric split squats with a 3-minute rest between sets as a conditioning activity performed by non-dominant limb.

Primary outcomes

  1. Drop Jump Height

    Time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.

    Drop jump height estimated via take-off velocity performed on force plates. Participants performed 2 trials at each time-point.

  2. Drop Jump Contact Time

    Time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.

    Drop jump contact time was estimated via time spent on the ground between drop and jump transition performed on force plates. Participants performed 2 trials at each time-point.

  3. Drop Jump Reactive Strength Index

    Time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.

    Drop jump reactive strength index was estimated via jump height divided by the contact time performed on force plates. Participants performed 2 trials at each time-point.

Sponsors and collaborators

Lead sponsor

The Jerzy Kukuczka Academy of Physical Education in Katowice

Other

Collaborators

  • Charles University, Czech Republic
  • University School of Physical Education, Krakow, Poland

Registry information

Official study title

Effects of Overcoming Isometric Unilateral Conditioning Activity on Subsequent Single-Leg Drop Jump in Elite and Amateur Volleyball Players

Important dates

Study start
2023
Primary completion
2023
Study completion
2023
First posted
Jun 14, 2024
Registry last updated
Jun 14, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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