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IRCT20250703066348N1 IRCT 2025-08-31 Shomal University Investigating the effect of plyometric exercises on knee muscle strength and improvement of motor performance after anterior cruciate ligament surgery ACLR 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 2025-09-01 anticipated 30 Complete https://irct.ir/trial/84858 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: In this quasi-experimental study, 30 male athletes (with a history of one ACL reconstruction within the past 6 to 12 months) who were eligible for inclusion in the study were purposively identified and then divided into two equal groups (15 in the plyometric training group and 15 in the control group) by simple randomization. The randomization process was performed as follows: An independent person, unaware of the study objectives, randomly generated a list of numbers from 1 to 30 using random number generation software (such as Excel or Randomizer.org). Half of the numbers (e.g., even numbers) were assigned to the training group (Plyometric) and the other half (odd numbers) were assigned to the control group. In order to prevent any bias, the assignment of subjects to groups was done by an independent person and the researcher was unaware of the group assignment until the final list was completed (allocation concealment). During the randomization process, inclusion and exclusion criteria were predetermined, and only those who met all inclusion criteria were included in this allocation, Blinding description: 1. Blinded Outcome Assessor: All outcome measurements, including isokinetic strength assessments of the quadriceps and hamstrings, as well as functional performance tests of the lower extremity (e.g., single-leg hop tests), will be conducted by a trained assessor who is completely blinded to the participants’ group allocation. The outcome assessor will not be involved in the intervention phase and will only participate in the pre-test and post-test assessments. Participants will be instructed not to disclose their group assignment or any intervention details during testing. All assessments will be performed under standardized conditions (time, location, and equipment) for all participants. 2. Blinded Data Analyst: The collected data will be coded (e.g., as Group A and Group B) before statistical analysis. The data analyst will be blinded to the actual group identities throughout the entire analysis process. Group codes will only be revealed after statistical comparisons and interpretations are completed. 2 Anterior Cruciate Ligament Reconstruction. 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 session: 5 min warm-up, 40 min training, 5 min cool-down).Exercises include single- and double-leg jumps, forward-backward hopping, lateral hopping, vertical jumps, and zigzag patterns. The intensity and complexity of the exercises will be progressively increased through three planned phases. Intervention 2: Control group: Participants in the control group will not receive any additional intervention during the 6-week study period. They will continue their usual daily activities, team practices, or general physical routines without any structured plyometric training.Weekly follow-up (by phone or in-person) will be conducted to ensure adherence and confirm no major changes in physical activity.Pre- and post-intervention assessments will be performed identically to the intervention group.At the end of the study, participants will be offered access to the training protocol if interested. No - There is not a plan to make this available Justification or reason for not sharing IPD is Due to ethical considerations and the need to protect the confidentiality of participants’ personal information, individual-level raw data will not be made publicly available. Sharing such data could potentially lead to identification of participants even after anonymization
public Reza Rezaeian vaskasi
Imamzadeh Abdullah Crossroads, 5th km of Haraz Road, Amol City ,Mazandaran Province
Amol Iran (Islamic Republic of) ۴۶۱۶۱۸۴۵۹۶ +98 11 4420 3711 rezaeianr7@gmail.com shomal university scientific Komeil Dashti
University of Mazandaran, University Boulevard , Babolsar City , Mazandaran Province
Babolsar Iran (Islamic Republic of) ۱۳۵۳۴ – ۴۷۴۱۶ +98 11 3530 2801 kdr_140@yahoo.com University of Mazandaran Iran (Islamic Republic of) 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 18 years 35 years Male 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) S83.5 Sprain of cruciate ligament of knee Rehabilitation Rehabilitation 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 session: 5 min warm-up, 40 min training, 5 min cool-down).Exercises include single- and double-leg jumps, forward-backward hopping, lateral hopping, vertical jumps, and zigzag patterns. The intensity and complexity of the exercises will be progressively increased through three planned phases. Control group: Participants in the control group will not receive any additional intervention during the 6-week study period. They will continue their usual daily activities, team practices, or general physical routines without any structured plyometric training.Weekly follow-up (by phone or in-person) will be conducted to ensure adherence and confirm no major changes in physical activity.Pre- and post-intervention assessments will be performed identically to the intervention group.At the end of the study, participants will be offered access to the training protocol if interested. 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 period (week 6). Method of measurement: Single-leg hop: The subject jumps forward with one leg and lands on the same leg. The longest distance of the successful jump is recorded. 5. Triple jump test with both legs, measuring the jump distance with a tape measure. Timepoint: triple-leg hop: The subject jumps forward with one leg and lands on the same leg. The longest distance of the successful jump is recorded. Method of measurement: Triple jump: Three consecutive jumps on one leg, maintaining balance at the end, and measuring the total distance traveled. The jump distance is measured with a tape measure on the ground and in centimeters. Vice President for Research, Shomal University Approved 2025-06-28 Shahrood University of Technology Research Ethics Committee Shahrood University of Technology,Haft Tir Square, Shahrood , Semnan, Iran Shahrood Semnan Iran (Islamic Republic of)