Neuromuscular Strength Factors Influencing Vertical Jump Performance

NCT07560930 | Completed

• 1 other identifier: E-87914409-050.03.04-230006086
• Study Type: observational
• Target: 81
• Locations: 1 country
• Sites: 1

Brief Summary

This cross-sectional observational study is designed to comprehensively analyze the relationship between high-volume isokinetic muscle performance and explosive vertical jump capacity in healthy, recreationally active young adult males. While traditional neuromuscular assessments frequently emphasize momentary peak force (Peak Torque), this study investigates the hypothesis that sustained mechanical work capacity (Total Work) and fatigue resistance (Fatigue Index) are more robust predictors of complex explosive tasks such as the countermovement jump (CMJ). Methodology and Testing Protocol: Participants will complete all assessments in a single laboratory session under controlled environmental conditions. The standardized testing sequence is as follows:

1. 1.Anthropometric and Body Composition Assessment: Participants' height, body mass, and body fat percentage will be measured using a multi-frequency bioelectrical impedance analyzer (InBody 270) following standard manufacturer protocols.
2. 2.Countermovement Jump (CMJ) Test: Following a standardized dynamic warm-up, participants will perform the CMJ test on a validated contact mat system (SmartJump). Participants will start from a standing position with hands placed on the hips to eliminate the influence of arm swing. They will perform a quick downward countermovement to approximately 90 degrees of knee flexion and execute a maximal vertical jump. Three trials will be conducted with a 30-second rest interval between attempts, and the highest jump will be recorded for analysis.
3. 3.Isokinetic Muscle Strength and Fatigue Test: After a 5-minute cycle ergometer warm-up, participants will undergo isokinetic testing on a computerized dynamometer (Humac Norm). Following familiarization trials, participants will execute a high-volume fatigue protocol consisting of 50 continuous, maximal concentric knee flexion and extension repetitions at an angular velocity of 180°/sec for both legs.

Conditions

Conditions or Focus of Study

Keywords

Muscle Strength; Athletic Performance; Physical Performance

Outcome Measures

Primary Outcomes (2)

• Isokinetic Extension Total Work (ETW)

  The total mechanical work capacity of the knee extensor muscles, measured in Newton-meters (Nm) over a 50-repetition maximal isokinetic protocol at 180°/sec.

  Baseline (Single laboratory visit)

• Countermovement Jump (CMJ) Height

  Maximum vertical jump height achieved during the CMJ test, measured in centimeters (cm) using a contact mat system.

  Baseline (Single laboratory visit)

Study Arms (1)

Study cohort

Healthy, recreationally active young adult males who underwent body composition, countermovement jump (CMJ), and isokinetic muscle strength testing

Eligibility Criteria

• Age: 22 Years - 26 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

The study population consists of healthy, recreationally active young adult males (mean age of approximately 24 years). Participants are moderately to highly physically active individuals (e.g., engaging in walking or jogging 1-2 times weekly) with no recent history of musculoskeletal pain, lower body surgery, or consumption of ergogenic aids.

You may qualify if:

• Healthy young adult males
• Moderately or highly physically active (e.g., walking or jogging 1-2 times weekly)
• No consumption of any ergogenic aids or stimulants in the past 6 months

You may not qualify if:

• Presence of any musculoskeletal pain
• History of major lower body surgery within the last six months

Sponsors & Collaborators

• Uludag University: lead

Study Sites (1)

Bursa Uludag University

Bursa, Turkey (Türkiye)

Location

Related Publications (4)

• Bohannon, N. A., Gillen, Z. M., Shoemaker, M. E., McKay, B. D., Gibson, S. M., & Cramer, J. T. (2020). Test-Retest Reliability of Static and Countermovement Power Push-Up Tests in Young Male Athletes. J Strength Cond Res, 34(9), 2456-2464. https://doi.org/10.1519/jsc.0000000000003684 Bridgeman, L. A., McGuigan, M. R., Gill, N. D., & Dulson, D. K. (2018). Relationships Between Concentric and Eccentric Strength and Countermovement Jump Performance in Resistance Trained Men. J Strength Cond Res, 32(1), 255-260. https://doi.org/10.1519/jsc.0000000000001539 Carr, J. C., Beck, T. W., Ye, X., & Wages, N. P. (2015). An Examination of Fatigue Index and Velocity-Related Force Loss for the Forearm Flexors. J Strength Cond Res, 29(8), 2304-2309. https://doi.org/10.1519/jsc.0000000000000879 Cerrah, A. O., & Bayram, İ. (2022). Relationship Between Isokinetic Strength, Vertical Jump, Sprint Speed, Agility And Yo-Yo Intermittent Recovery Test Performance in Soccer Players. European Journal of Physical Education and Sport Science, 9. https://doi.org/10.46827/ejpe.v9i2.4514 Chen, C., Ali, Z., Rehman Rashid, M. A., Samethanovna, M. U., Wu, G., Mukhametkali, S., & Dilnur, T. (2023). Relationship between isokinetic strength of the knee joint and countermovement jump performance in elite boxers. PeerJ, 11, e16521. https://doi.org/10.7717/peerj.16521 Ciccone, A. B., Deckert, J. A., Herda, T. J., Gallagher, P. M., & Weir, J. P. (2017). Methodological Differences in the Interpretation of Fatigue Data from Repeated Maximal Effort Knee Extensions. Open Sports Sciences Journal, 10. https://doi.org/10.2174/1875399X01710010037 Cohen, J. (1988). Statistical Power Analysis for the Behavioral Sciences. L. Erlbaum Associates. https://books.google.tn/books?id=gA04ngAACAAJ Fischer, F., Blank, C., Dünnwald, T., Gföller, P., Herbst, E., Hoser, C., & Fink, C. (2017). Isokinetic Extension Strength Is Associated With Single-Leg Vertical Jump Height. Orthop J Sports Med, 5(11), 2325967117736766. http

  BACKGROUND

• Downing JJ, Wilcox AR. Effects of an eight-week training program on upper-body power in women cross-country skiers. J Strength Cond Res. 2003 Nov;17(4):726-33. doi: 10.1519/1533-4287(2003)0172.0.co;2.

  PMID: 14636113 BACKGROUND

• Bridgeman LA, McGuigan MR, Gill ND, Dulson DK. Relationships Between Concentric and Eccentric Strength and Countermovement Jump Performance in Resistance Trained Men. J Strength Cond Res. 2018 Jan;32(1):255-260. doi: 10.1519/JSC.0000000000001539.

  PMID: 27438063 BACKGROUND

• Bohannon NA, Gillen ZM, Shoemaker ME, McKay BD, Gibson SM, Cramer JT. Test-Retest Reliability of Static and Countermovement Power Push-Up Tests in Young Male Athletes. J Strength Cond Res. 2020 Sep;34(9):2456-2464. doi: 10.1519/JSC.0000000000003684.

  PMID: 32865943 BACKGROUND

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Study Record Dates

• First Submitted: April 24, 2026
• First Posted: May 1, 2026
• Study Start: March 1, 2024
• Primary Completion: November 1, 2025
• Study Completion: December 12, 2025
• Last Updated: May 1, 2026

Record last verified: 2026-04

Data Sharing

• IPD Sharing: Will not share

Locations

TU (1)