The Effect of Recovery Training on Lower Extremity Explosive Strength in Tennis Players

April 23, 2026 updated by: alyildirim, Biruni University

This study was designed to examine the effects of recovery training on lower extremity explosive strength performance in tennis players. Recovery methods are known to play an important role in reducing muscle fatigue, accelerating the recovery process, and decreasing the risk of injury among athletes. However, the effects of recovery training on lower extremity explosive strength in tennis players have not been sufficiently investigated in the literature.

This study will be conducted as a randomized controlled experimental design. Volunteer athletes aged 11-17 who regularly play tennis will be included in the study. Participants will be randomly divided into two groups: the control group will continue only their regular tennis training, while the experimental group will receive additional recovery training along with their routine tennis sessions. Lower extremity explosive strength will be evaluated using the countermovement jump, squat jump, reactive strength index (RSI), standing long jump, single-leg hop, and single-leg vertical jump tests. Measurements will be performed before and after the six-week training period.

The findings obtained from this research will scientifically reveal the contribution of recovery training to performance improvement in tennis players and provide evidence-based insights for optimizing athlete health and training program design.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

28

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Turkey (Türkiye)
    • Maltepe
      • Istanbul, Maltepe, Turkey (Türkiye), 34844
        • Sportplus Tennis Academy

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Must be 11-18 years old and have been playing tennis for the past year.
  • Must be cooperative.
  • Must have participated in regular tennis training for at least 2 years.
  • Must have no history of acute lower extremity injury before the study.
  • Must be voluntary and have signed an informed consent form from the athlete and/or their parent.

Exclusion Criteria:

  • Having a history of acute injury, fracture, surgery, or chronic musculoskeletal problems affecting the lower extremity
  • Having a neurological or cardiovascular disease
  • Having taken a break from sports due to a serious lower extremity injury within the last 6 months

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Control Group
Participants in this group will continue their regular tennis training
Experimental: Recovery Training Group
Participants in this group will continue their regular tennis training and additionally perform recovery training twice a week for four weeks. The recovery sessions include stretching, foam rolling, and relaxation exercises designed to enhance recovery and improve lower extremity explosive strength.
Other: Recovery Training Group
Participants in this group will continue their regular tennis training and additionally perform recovery training twice a week for four weeks. The recovery sessions include stretching, foam rolling, and relaxation exercises designed to enhance recovery and improve lower extremity explosive strength.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Countermovement Jump Height
Time Frame: 4 weeks
The countermovement jump (CMJ) test was used to assess lower extremity explosive performance. Participants started from an upright standing position with hands placed on the hips. Following a rapid downward movement involving hip and knee flexion, participants immediately performed a maximal vertical jump. Jump height (cm) was recorded using [measurement device - e.g., force plate / jump mat / Optojump system]. The CMJ reflects the efficiency of the stretch-shortening cycle and is considered a reliable indicator of explosive lower limb performance.
4 weeks
Squat Jump Height
Time Frame: 4 weeks
The squat jump (SJ) test was used to assess concentric lower extremity explosive performance. Participants started from a semi-squat position with approximately 90° of hip and knee flexion, with hands placed on the hips. After holding this position briefly to eliminate the contribution of elastic energy, participants performed a maximal vertical jump without a preparatory countermovement. Jump height (cm) was recorded using [measurement device - e.g., force plate / jump mat / Optojump system]. The SJ test allows direct evaluation of concentric muscle power of the lower limbs.
4 weeks
Reactive Strength Index
Time Frame: 4weeks
RSI is a performance measure that reflects reactive strength and neuromuscular efficiency. It is typically assessed through a drop jump in which the participant steps off a platform, lands, and performs a quick rebound jump with minimal ground contact time. RSI is sensitive to the athlete's ability to rapidly switch from eccentric to concentric action, a capacity highly relevant to sports requiring explosive changes in direction, such as tennis .
4weeks
Standing Long Jump
Time Frame: 4 weeks
SLJ, also known as the broad jump, is a field-based test for assessing horizontal explosive strength of the lower extremities. The participant stands with feet shoulder-width apart, swings the arms, and jumps forward as far as possible. The landing distance, measured from the starting line to the heel mark, reflects the ability of the lower-limb muscles to generate forward propulsion .
4 weeks
Single-Leg Hop for Distance
Time Frame: 4 weeks
SLH test evaluates unilateral lower-limb performance and limb symmetry. The participant stands on one leg, performs a maximal forward hop, and lands on the same leg while maintaining balance for at least two seconds. Distances are recorded for both legs, and comparisons provide valuable insights into side-to-side asymmetries, rehabilitation status, and injury risk.
4 weeks
Single-Leg Vertical Jump Height
Time Frame: 4 weeks
The single-leg vertical jump (SLVJ) test was used to assess unilateral lower extremity explosive performance. Participants stood on one leg with hands placed on the hips, while the non-supporting leg was flexed and held stationary. From a stable standing position, participants performed a maximal vertical jump using the supporting leg only. Jump height (cm) was recorded separately for each limb using [measurement device - e.g., force plate / jump mat / Optojump system]. This test allows evaluation of unilateral vertical force production and identification of inter-limb asymmetries.is .
4 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Biruni University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

December 10, 2025

Primary Completion (Actual)

January 20, 2026

Study Completion (Actual)

January 30, 2026

Study Registration Dates

First Submitted

November 25, 2025

First Submitted That Met QC Criteria

December 13, 2025

First Posted (Actual)

December 29, 2025

Study Record Updates

Last Update Posted (Actual)

April 28, 2026

Last Update Submitted That Met QC Criteria

April 23, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 1669

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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