Healthy Tennis PlayersNCT07306351
The Effect of Recovery Training on Lower Extremity Explosive Strength in Tennis Players
A study testing Recovery Training Group in people with Healthy Tennis Players, run by Biruni University at 1 site in Turkey (Türkiye).
Trial summary
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. Read more about this study
- Who is it for?
- Ages 11 to 18 yearsHealthy volunteers can take part
- Conditions the study is for
- Healthy Tennis Players
- What is being tested?
- Recovery Training Group
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 28 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 10 Dec 2025to 30 Jan 2026
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 11 to 18 years
- All sexes
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- 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.
Who cannot join
- 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
Trial locations and contacts
1 site in 1 country.
Turkey (Türkiye)1 site
Sportplus Tennis Academy
Istanbul, Maltepe, 34844
About this study
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.
- Conditions
- Healthy Tennis Players
- Being tested
- Recovery Training Group
- Keywords
- Recovery training, Explosive strength, Tennis player, Sports performance
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Recovery Training GroupOther
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.
| Study group | Role | What they receive |
|---|---|---|
| Control Group | No intervention | Participants in this group will continue their regular tennis training |
| Recovery Training Group | Experimental | 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. Receives: Other: Recovery Training Group |
What is being measured
The primary outcome is the main question the study is designed to answer.
Countermovement Jump Height
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.
Measured: 4 weeks
Squat Jump Height
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.
Measured: 4 weeks
Reactive Strength Index
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 .
Measured: 4weeks
Standing Long Jump
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 .
Measured: 4 weeks
Single-Leg Hop for Distance
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.
Measured: 4 weeks
Single-Leg Vertical Jump Height
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 .
Measured: 4 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted29 Dec 2025
- Study start10 Dec 2025
- Primary completion20 Jan 2026
- Study completion30 Jan 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (7)Papers the sponsor has linked to this study.
- Other trials for Healthy Tennis PlayersStudies of the same condition, open and under way.
- More trials run by Biruni UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- The experimental group will receive recovery training in addition to routine tennis training.
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 28 participants (actual)
Sponsor and investigators
- Lead sponsor
- Biruni University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, alyildirim, Biruni University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07306351
- Sponsor's protocol ID
- 1669
- Status last verified
- Apr 2026
- First submitted
- 25 Nov 2025
- Last updated
- 28 Apr 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Markovic G, Mikulic P. Neuro-musculoskeletal and performance adaptations to lower-extremity plyometric training. Sports Med. 2010 Oct 1;40(10):859-95. doi: 10.2165/11318370-000000000-00000.
PubMed 20836583Moran J, Ramirez-Campillo R, Granacher U. Effects of Jumping Exercise on Muscular Power in Older Adults: A Meta-Analysis. Sports Med. 2018 Dec;48(12):2843-2857. doi: 10.1007/s40279-018-1002-5.
PubMed 30341594Ebben WP, Petushek EJ. Using the reactive strength index modified to evaluate plyometric performance. J Strength Cond Res. 2010 Aug;24(8):1983-7. doi: 10.1519/JSC.0b013e3181e72466.
PubMed 20634740Castro-Pinero J, Ortega FB, Artero EG, Girela-Rejon MJ, Mora J, Sjostrom M, Ruiz JR. Assessing muscular strength in youth: usefulness of standing long jump as a general index of muscular fitness. J Strength Cond Res. 2010 Jul;24(7):1810-7. doi: 10.1519/JSC.0b013e3181ddb03d.
PubMed 20555277Gustavsson A, Neeter C, Thomee P, Silbernagel KG, Augustsson J, Thomee R, Karlsson J. A test battery for evaluating hop performance in patients with an ACL injury and patients who have undergone ACL reconstruction. Knee Surg Sports Traumatol Arthrosc. 2006 Aug;14(8):778-88. doi: 10.1007/s00167-006-0045-6. Epub 2006 Mar 9.
PubMed 16525796Meylan C, McMaster T, Cronin J, Mohammad NI, Rogers C, Deklerk M. Single-leg lateral, horizontal, and vertical jump assessment: reliability, interrelationships, and ability to predict sprint and change-of-direction performance. J Strength Cond Res. 2009 Jul;23(4):1140-7. doi: 10.1519/JSC.0b013e318190f9c2.
PubMed 19528866Dupuy O, Douzi W, Theurot D, Bosquet L, Dugue B. An Evidence-Based Approach for Choosing Post-exercise Recovery Techniques to Reduce Markers of Muscle Damage, Soreness, Fatigue, and Inflammation: A Systematic Review With Meta-Analysis. Front Physiol. 2018 Apr 26;9:403. doi: 10.3389/fphys.2018.00403. eCollection 2018.
PubMed 29755363
Study at a glance
From the registry record, last updated by the sponsor on 28 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The Effect of Recovery Training on Lower Extremity Explosive Strength in Tennis Players
- ClinicalTrials.gov ID
- NCT07306351
- Acronym / sponsor ID
- 1669
- Conditions
- Healthy Tennis Players
- Keywords
- Recovery training, Explosive strength, Tennis player, Sports performance
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 28 participants (actual)
- Lead sponsor
- Biruni UniversityUniversity, hospital or other
- Study start
- 10 Dec 2025 (actual)
- Primary completion
- 20 Jan 2026 (actual)
- Study completion
- 30 Jan 2026 (actual)
- First posted
- 29 Dec 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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 design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 2
- Model description
- The experimental group will receive recovery training in addition to routine tennis training.
| Arm | Type | Receives |
|---|---|---|
| Control Group | No intervention | –Participants in this group will continue their regular tennis training |
| Recovery Training Group | Experimental | Other: Recovery Training GroupParticipants 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. |
Who may qualify
- Ages
- 11 to 18 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (5 listed)
- 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.
Key exclusion criteria (3 listed)
- 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
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Recovery Training GroupParticipants 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 |
Primary outcome
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.
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.
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 .
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 .
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.
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 .
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 28 Apr 2026.
- Results publication: PubMed 20836583Markovic G, Mikulic P. Neuro-musculoskeletal and performance adaptations to lower-extremity plyometric training. Sports Med. 2010 Oct 1;40(10):859-95. doi: 10.2165/11318370-000000000-00000.
- Results publication: PubMed 30341594Moran J, Ramirez-Campillo R, Granacher U. Effects of Jumping Exercise on Muscular Power in Older Adults: A Meta-Analysis. Sports Med. 2018 Dec;48(12):2843-2857. doi: 10.1007/s40279-018-1002-5.
- Results publication: PubMed 20634740Ebben WP, Petushek EJ. Using the reactive strength index modified to evaluate plyometric performance. J Strength Cond Res. 2010 Aug;24(8):1983-7. doi: 10.1519/JSC.0b013e3181e72466.
- Results publication: PubMed 20555277Castro-Pinero J, Ortega FB, Artero EG, Girela-Rejon MJ, Mora J, Sjostrom M, Ruiz JR. Assessing muscular strength in youth: usefulness of standing long jump as a general index of muscular fitness. J Strength Cond Res. 2010 Jul;24(7):1810-7. doi: 10.1519/JSC.0b013e3181ddb03d.
- Results publication: PubMed 16525796Gustavsson A, Neeter C, Thomee P, Silbernagel KG, Augustsson J, Thomee R, Karlsson J. A test battery for evaluating hop performance in patients with an ACL injury and patients who have undergone ACL reconstruction. Knee Surg Sports Traumatol Arthrosc. 2006 Aug;14(8):778-88. doi: 10.1007/s00167-006-0045-6. Epub 2006 Mar 9.
- Results publication: PubMed 19528866Meylan C, McMaster T, Cronin J, Mohammad NI, Rogers C, Deklerk M. Single-leg lateral, horizontal, and vertical jump assessment: reliability, interrelationships, and ability to predict sprint and change-of-direction performance. J Strength Cond Res. 2009 Jul;23(4):1140-7. doi: 10.1519/JSC.0b013e318190f9c2.
- Results publication: PubMed 29755363Dupuy O, Douzi W, Theurot D, Bosquet L, Dugue B. An Evidence-Based Approach for Choosing Post-exercise Recovery Techniques to Reduce Markers of Muscle Damage, Soreness, Fatigue, and Inflammation: A Systematic Review With Meta-Analysis. Front Physiol. 2018 Apr 26;9:403. doi: 10.3389/fphys.2018.00403. eCollection 2018.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Recovery Training Group in people with Healthy Tennis Players, run by Biruni University at 1 site in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 28 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Countermovement Jump Height (time frame: 4 weeks). The study lists 6 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07306351, which also lists 7 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Apr 2026.