Isokinetic Strength and Anaerobic Capacity (ISAC)

January 25, 2026 updated by: Ramiz ARABACI, Uludag University

The Effect of Isokinetic Strength on Anaerobic Capacity in Recreationally Active Young Adult Males

This study aims to investigate differences in isokinetic knee extensor and flexor strength parameters among recreationally active young adult males classified into low, moderate, and high anaerobic power groups based on relative peak power (W/kg) obtained from the Wingate Anaerobic Test. Eighty male participants aged 22-30 years, engaging in regular physical activity, will undergo body composition analysis, isokinetic strength testing at 60°/s, and a 30-second Wingate test performed on separate days. Participants will be grouped according to median-based anaerobic power classification to allow meaningful group comparisons. Group differences in peak torque and total work will be analyzed using ANOVA or non-parametric equivalents, and relationships between Wingate parameters and isokinetic strength will be examined using correlation analyses. The findings are expected to provide novel insights into the relationship between anaerobic power classification and lower-extremity muscle strength profiles, contributing to performance profiling and training planning in recreationally active populations.

Study Overview

Status

Not yet recruiting

Conditions

Detailed Description

This study will investigate the relationship between anaerobic power classification and isokinetic lower-extremity muscle strength in recreationally active young adult males. Participants will be classified into three anaerobic power groups (low, moderate, and high) based on relative peak power (W/kg) obtained from the Wingate Anaerobic Test. This classification approach is intended to move beyond single-variable correlation analyses commonly reported in the literature and to enable meaningful group-based comparisons of muscle strength profiles.

A total of 80 male participants aged 22-30 years who engage in regular physical activity at least twice per week will be recruited. Individuals with a history of serious orthopedic injury within the past six months, cardiovascular or respiratory disease, or regular medication use will be excluded. Body composition parameters will be assessed using bioelectrical impedance analysis prior to performance testing.

Isokinetic knee extensor and flexor strength of the dominant leg will be evaluated using concentric contractions at an angular velocity of 60°/s. Peak torque and total work values will be recorded as primary isokinetic strength outcomes. Anaerobic performance will be assessed on a separate day using a 30-second Wingate Anaerobic Test performed on a cycle ergometer, during which participants will be verbally encouraged to exert maximal effort throughout the test. Relative peak power, mean power, and fatigue index values will be obtained.

Participants will be grouped according to median-based classification of relative peak power values to facilitate comparison among anaerobic power levels in a sample of limited size. Differences in isokinetic strength parameters between groups will be analyzed using one-way analysis of variance or non-parametric equivalents when appropriate. Associations between Wingate-derived anaerobic parameters and isokinetic strength measures will also be examined using correlation analyses.

The results of this study are expected to clarify whether individuals with higher anaerobic power levels demonstrate superior isokinetic knee extensor and flexor strength profiles. The findings may contribute to a better understanding of the interaction between anaerobic performance capacity and lower-extremity muscle strength, with potential implications for performance profiling, training program design, and exercise-based rehabilitation strategies in recreationally active populations.

Study Type

Observational

Enrollment (Estimated)

80

Contacts and Locations

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

Study Contact

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

  • Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Probability Sample

Study Population

The study population will consist of recreationally active young adult males aged 22-30 years who engage in regular physical activity at least two days per week. Participants will be non-elite individuals without a history of serious orthopedic injury within the past six months, cardiovascular or respiratory disease, or regular medication use. All participants will be healthy volunteers capable of performing maximal exercise testing and will provide written informed consent prior to participation.

Description

Inclusion Criteria:

  • Male participants aged between 20 and 30 years

    • Moderately physically active individuals, as defined by the International Physical Activity Questionnaire (IPAQ)
    • Apparently healthy, with no known neurological, vestibular, or musculoskeletal disorders affecting balance
    • Ability to stand independently and complete balance assessments
    • Willingness to participate and provide written informed consent

Exclusion Criteria:

  • History of lower-limb, spine, or pelvic injury or surgery within the past 6 months

    • Presence of acute or chronic pain affecting posture or balance
    • Diagnosed neurological, vestibular, or balance disorders
    • Use of medications or substances that may affect neuromuscular function or postural control
    • Participation in another clinical or observational study within the past 3 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

Cohorts and Interventions

Group / Cohort
Low Anaerobic Power (LAP)
Participants are recreationally active young adult males classified into three cohorts based on relative peak power (W/kg) obtained from the Wingate Anaerobic Test. The low, moderate, and high anaerobic power groups represent individuals with differing anaerobic performance capacities derived from median-based classification. All participants are physically active but non-elite, with no recent history of orthopedic injury or cardiopulmonary disease. Comparisons among cohorts are conducted to examine differences in isokinetic knee extensor and flexor strength parameters.
Moderate Anaerobic Power (MAP)
Participants are recreationally active young adult males classified into three cohorts based on relative peak power (W/kg) obtained from the Wingate Anaerobic Test. The low, moderate, and high anaerobic power groups represent individuals with differing anaerobic performance capacities derived from median-based classification. All participants are physically active but non-elite, with no recent history of orthopedic injury or cardiopulmonary disease. Comparisons among cohorts are conducted to examine differences in isokinetic knee extensor and flexor strength parameters.
High Anaerobic Power (HAP)
Participants are recreationally active young adult males classified into three cohorts based on relative peak power (W/kg) obtained from the Wingate Anaerobic Test. The low, moderate, and high anaerobic power groups represent individuals with differing anaerobic performance capacities derived from median-based classification. All participants are physically active but non-elite, with no recent history of orthopedic injury or cardiopulmonary disease. Comparisons among cohorts are conducted to examine differences in isokinetic knee extensor and flexor strength parameters.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Isokinetic knee extensor and flexor peak torque (Nm) at 60°/s
Time Frame: day 1 (Assessed during a single laboratory testing session.)
Peak torque values of the knee extensor and flexor muscles will be assessed using isokinetic dynamometry during concentric contractions at an angular velocity of 60°/s. Measurements will be obtained from the dominant leg following a standardized warm-up protocol. Peak torque (Nm) will be used as the primary indicator of maximal dynamic muscle strength.
day 1 (Assessed during a single laboratory testing session.)

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Wingate-derived anaerobic performance parameters
Time Frame: day 1 (Assessed during a single laboratory testing session.)
Anaerobic performance will be assessed using the 30-second Wingate Anaerobic Test performed on a cycle ergometer. Relative peak power (W/kg) will be used.
day 1 (Assessed during a single laboratory testing session.)

Collaborators and Investigators

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

Sponsor

Uludag 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 (Estimated)

January 5, 2026

Primary Completion (Estimated)

March 1, 2026

Study Completion (Estimated)

March 1, 2026

Study Registration Dates

First Submitted

January 9, 2026

First Submitted That Met QC Criteria

January 25, 2026

First Posted (Actual)

January 29, 2026

Study Record Updates

Last Update Posted (Actual)

January 29, 2026

Last Update Submitted That Met QC Criteria

January 25, 2026

Last Verified

January 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • E-87914409-050.04-117159

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

This observational study will follow a cross-sectional group comparison design. Eligible participants will undergo body composition assessment, isokinetic knee extensor and flexor strength testing, and a 30-second Wingate Anaerobic Test conducted on separate days. Based on relative peak power (W/kg) derived from the Wingate test, participants will be classified into low, moderate, and high anaerobic power groups. Isokinetic strength parameters will be compared across groups, and associations between anaerobic performance and muscle strength measures will be analyzed to address the study objectives.

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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