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

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

Study Overview

• Status: Completed
• Conditions: Resistance Training
• Intervention / Treatment: Other: Dominant Limb Overcoming Isometric Conditioning Activity; Other: Non-dominant Limb Overcoming Isometric Conditioning Activity

• Study Type: Interventional
• Enrollment (Actual): 20
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Poland
  • Slask
    • Katowice, Slask, Poland, 40-065
      • The Jerzy Kukuczka Academy of Physcial Education in Katowice

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: No

Description

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:

-

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Crossover Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Dominant Limb Conditioning Activity; Each participant performed a single-leg drop jump for both the dominant and non-dominant limbs before and after completing the CA.	Other: Dominant Limb Overcoming Isometric Conditioning Activity; 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.
Experimental: Non-dominant Limb Conditioning Activity; Each participant performed a single-leg drop jump for both the non-dominant and non-dominant limbs before and after completing the CA.	Other: Non-dominant Limb Overcoming Isometric Conditioning Activity; 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.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Drop Jump Height	Drop jump height estimated via take-off velocity performed on force plates. Participants performed 2 trials at each time-point.	Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop Jump Contact Time	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.	Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop Jump Reactive Strength Index	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.	Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.

Collaborators and Investigators

• Sponsor: The Jerzy Kukuczka Academy of Physical Education in Katowice
• Collaborators: Charles University, Czech Republic; University School of Physical Education, Krakow, Poland

Study record dates

Study Major Dates

• Study Start (Actual): April 2, 2023
• Primary Completion (Actual): June 5, 2023
• Study Completion (Actual): July 3, 2023

Study Registration Dates

• First Submitted: June 10, 2024
• First Submitted That Met QC Criteria: June 10, 2024
• First Posted (Actual): June 14, 2024

Study Record Updates

• Last Update Posted (Actual): June 14, 2024
• Last Update Submitted That Met QC Criteria: June 10, 2024
• Last Verified: June 1, 2024

More Information

Terms related to this study

• Keywords: physical activity; resistance training; athletic performance; strength and conditioning
• Other Study ID Numbers: PRIMUS 22/HUM/019

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No