Strength Training on Muscle Power Output and Neuromuscular Adaptation Among China University Long Jump Athletes
NCT Number: NCT06468449
Status: RECRUITING
Study Type: INTERVENTIONAL
Phases: NA
Conditions: Physical Dependence
Interventions: OTHER: Lower limb power output training|OTHER: Force Combined Speed training
Sponsor: Rong Wenchao
Sex: MALE
Age: ADULT, OLDER_ADULT
Enrollment: 64
Study Design: Allocation: RANDOMIZED|Intervention Model: SEQUENTIAL|Masking: SINGLE (PARTICIPANT)|Primary Purpose: BASIC_SCIENCE
Start Date: 2024-03-05
Completion Date: 2024-10-05
Locations: YanShan university, QinHuangdao, HeiBei, 066004, China|Rong Wenchao, Qinhuangdao, HeiBei, 066400, China

Summary:
The purpose of this study is to investigate the effects of optimal load strength training on the lower limb neuromuscular adaptation of athletes. An anatomical analysis of the vertical jump reveals three phases: the propulsion phase, the flight phase, and the landing phase.

This study is an 8-week randomized controlled trial. After selecting the participants, basic information such as height, weight, age, and years of training experience is collected. Subsequently, a maximal output power test for lower limb squatting is conducted. Participants are then randomly assigned to the speed group, power group, and strength group. The optimal power load for the power group is determined based on the participant maximal output power. Training plans are developed for the traditional group, power group, and strength group. Each training session is organized and supervised by a designated person. Surface electromyography, three-dimensional motion capture systems, and force platforms are used to collect electromyographic and kinetic data of participants during pre-test and post-test vertical jump actions. Electromyography evoked potential instruments and myotonometer are used to collect nerve signals of the tibial nerve (posterior calf) and muscle fiber dimension data of the rectus femoris before and after the experiment. Additionally, static full-range-of-motion vertical jump kinematics and kinetics data are collected before and after the experiment. To ensure the quality and validity of the intervention, the following controls are implemented during the experiment: first, communication with the participants to inform them of the purpose of the study and ensure adherence to the correct movement standards during testing; second, having a designated person responsible for resistance training during the experiment; third, using the same equipment and team for testing to maximize the controllability of the experiment process; fourth, providing verbal encouragement to participants during testing to maximize effort and minimize experimental errors. The aim is to determine the effects of optimal load strength training on improving the lower limb output power during the propulsion phase of the take-off stage in long jump athletes and the underlying neuromuscular adaptation mechanisms.

Primary Outcome Measures: Indicators of Neurological Adaptation（Number of nerve impulses）, This includes the number of nerve impulses. Using wireless electromyography signal collection system, From enrollment to the end of treatment at 8 weeks|Muscle adaptation indicators (Muscle cross-sectional area), Muscle cross-sectional area assessment uses ultrasound to measure the cross-sectional area of the rectus femoris muscle fibers to assess muscle adaptation, From enrollment to the end of treatment at 8 weeks|Sports performance indicators (Vertical jump speed ), This study used three-dimensional motion capture equipment and a test bench to test the vertical jump speed of athletes., From enrollment to the end of treatment at 8 weeks|Sports performance indicators (Power output), This study used three-dimensional motion capture equipment and a test bench to test the power output of athletes' lower limbs., From enrollment to the end of treatment at 8 weeks|Sports performance indicators (Take-off height), This study used three-dimensional motion capture equipment and a test bench to test the athletes' take-off height before and after the experiment., From enrollment to the end of treatment at 8 weeks|Indicators of Neurological Adaptation ( Nerve impulse frequency), This includes nerve impulse frequency，Using wireless electromyography signal collection system, From enrollment to the end of treatment at 8 weeks|Indicators of Neurological Adaptation (M wave amplitude), This includes the M wave amplitude，The test was performed using a potential evoked instrument., From enrollment to the end of treatment at 8 weeks|Indicators of Neurological Adaptation (H-max/ M-max), This includes the H-max/ M-max. The test was performed using a potential evoked instrument. Among them, M-max refers to the average value of the first ten M-wave amplitude peaks. H-max refers to the maximum value of the H wave observed when the sensory nerve is stimulated at a frequency of 1Hz., From enrollment to the end of treatment at 8 weeks|Indicators of Neurological Adaptation （Nerve conduction velocity）, Nerve conduction velocity. The test was performed using a potential evoked instrument., From enrollment to the end of treatment at 8 weeks|Indicators of Neurological Adaptation （Latency of the H reflex）, Latency of the H reflex. The test was performed using a potential evoked instrument., From enrollment to the end of treatment at 8 weeks|Indicators of Neurological Adaptation （presynaptic inhibition）, This includes presynaptic inhibition. This value can only be obtained by processing the H reflex amplitude and the M wave amplitude. The presynaptic inhibition calculation formula is: Hmax1Hz = (Ave. H1:H10) / H1 PSI = Hmax1Hz / Mmax., From enrollment to the end of treatment at 8 weeks