Investigating the effect of plyometric exercises on knee muscle strength and improvement of motor performance after anterior cruciate ligament surgery

The effect of 6 weeks of plyometric exercises on the strength of muscles around the knee and lower extremity Functional performance in male underwent Anterior cruciate ligament reconstruction: A clinical trial study

Status

Recruiting

Phases

Phase 2

Study type

Interventional

Source

IRCT

Registry ID

IRCT20250703066348N1

Enrollment

Registered

2025-08-31

Start date

2025-09-01

Completion date

Unknown

Last updated

2025-09-15

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Anterior Cruciate Ligament Reconstruction. Sprain of cruciate ligament of knee

Interventions

Intervention 1: Intervention group : Participants in the intervention group will undergo a supervised plyometric training program for 6 weeks, with 3 sessions per week (approximately 50 minutes per se

Eligibility

Sex/Gender

Male

Age

18 Years to 35 Years

Inclusion criteria

Inclusion criteria: Males aged 18-35 years Confirmation of ACL reconstruction (patellar and hamstring tendon autograft) by a knee specialist with radiographs and MRI No history of back or lower extremity surgery (other than knee) ACL reconstruction history at least 6 months and no more than 12 months ago

Exclusion criteria

Exclusion criteria: Concomitant injury or surgery to other knee ligaments or structures Injury or surgery in other lower limb joints (hip, ankle) Neuromuscular or cardiovascular disorders limiting exercise participation Participation in other rehabilitation or training programs within the past 3 months Non-adherence (absence from >2 training or testing sessions)

Design outcomes

Primary

Measure	Time frame
1. Quadriceps muscle strength: measured with an isokinetic device at a 6-degree angle, recording normalized torque based on body weight. Timepoint: Quadriceps muscle strength will be measured once before the start of the intervention (week 0) and once immediately after the end of the training period (week 6). Method of measurement: Quadriceps muscle strength is assessed using an isokinetic machine at an angular velocity of 60 degrees/second. After sitting on the machine seat, the subject extends the knee with maximum force, and the maximum torque produced (in Newton meters/kg) is recorded.;1. hamstring muscle strength: measured with an isokinetic device at a 6-degree angle, recording normalized torque based on body weight. Timepoint: hamstring muscle strength will be measured once before the start of the intervention (week 0) and once immediately after the end of the training period (week 6). Method of measurement: Hamstring muscle strength is assessed using an isokinetic device at an angular velocity of 60 degrees/second. After sitting on the device seat, the subject flexes the knee with maximum force, and the maximum torque produced (in Newton meters/kg) is recorded.;2. Hamstring to quadriceps muscle strength ratio: measured with an isokinetic device at an angular velocity of 60 degrees, recording normalized torque based on body weight. Timepoint: The ratio of hamstring to quadriceps muscle strength will be measured once before the start of the intervention (week 0) and once immediately after the end of the training period (week 6). Method of measurement: The hamstring to quadriceps strength ratio (H/Q Ratio) is obtained by dividing the hamstring muscle torque by the quadriceps muscle torque (in the 60-degree isokinetic test).;4. Single-leg jump test with both legs, measuring jump distance with a tape measure. Timepoint: Single-leg measurements will be measured once before the start of the intervention (week 0) and once immediately after the end of the training p	—

Measure

Time frame

1. Quadriceps muscle strength: measured with an isokinetic device at a 6-degree angle, recording normalized torque based on body weight. Timepoint: Quadriceps muscle strength will be measured once before the start of the intervention (week 0) and once immediately after the end of the training period (week 6). Method of measurement: Quadriceps muscle strength is assessed using an isokinetic machine at an angular velocity of 60 degrees/second. After sitting on the machine seat, the subject extends the knee with maximum force, and the maximum torque produced (in Newton meters/kg) is recorded.;1. hamstring muscle strength: measured with an isokinetic device at a 6-degree angle, recording normalized torque based on body weight. Timepoint: hamstring muscle strength will be measured once before the start of the intervention (week 0) and once immediately after the end of the training period (week 6). Method of measurement: Hamstring muscle strength is assessed using an isokinetic device at an angular velocity of 60 degrees/second. After sitting on the device seat, the subject flexes the knee with maximum force, and the maximum torque produced (in Newton meters/kg) is recorded.;2. Hamstring to quadriceps muscle strength ratio: measured with an isokinetic device at an angular velocity of 60 degrees, recording normalized torque based on body weight. Timepoint: The ratio of hamstring to quadriceps muscle strength will be measured once before the start of the intervention (week 0) and once immediately after the end of the training period (week 6). Method of measurement: The hamstring to quadriceps strength ratio (H/Q Ratio) is obtained by dividing the hamstring muscle torque by the quadriceps muscle torque (in the 60-degree isokinetic test).;4. Single-leg jump test with both legs, measuring jump distance with a tape measure. Timepoint: Single-leg measurements will be measured once before the start of the intervention (week 0) and once immediately after the end of the training p

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Countries

Iran (Islamic Republic of)

Contacts

Public ContactReza Rezaeian vaskasi

shomal university

rezaeianr7@gmail.com+98 11 4420 3711

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Feb 4, 2026