Investigating the Post-Activation Performance Enhancement Effects on Skeletal Muscles Under Varied Loading Conditions

NCT06464120 | Completed

• 1 other identifier: 2024Y002
• Study Type: interventional
• Target: 14
• Locations: 1 country
• Sites: 1

Brief Summary

With the advancement of sports science, Post-Activation Potentiation (PAP) has become a focal point of research, garnering significant attention for its underlying physiological mechanisms. Current studies suggest three primary mechanisms: 1) phosphorylation of myosin regulatory light chains (RLCs); 2) increased recruitment of high-threshold motor units; and 3) a reduction in sarcomere length heterogeneity within muscle fibers due to pre-stimulation (Liu \& Li, 2017). These mechanisms collectively contribute to an effect known as Post-Activation Performance Enhancement (PAPE), which significantly enhances muscle strength and explosiveness shortly after activation (Blazevich \& Babault, 2019). During the activation process of motor units with increasing loads, low-threshold motor units are recruited first, followed by high-threshold motor units. As the load increases, the root mean square (RMS) value increases linearly, further promoting the overlap of motor unit potentials and the rise in RMS values. This overlap in activation timing among adjacent motor units results in greater overall muscle force output (Liu, 2008; Tian, 2009). The significance of this lies in the fact that as the degree of muscle activation increases, especially under incremental loads, the muscle's ability to adapt to subsequent strength or explosive tasks may be enhanced. In competitive sports, optimizing the relationship between warm-up and performance is crucial. Research indicates that the duration of PAPE varies with individual differences, training type, intensity, and recovery intervals. The characteristics of the PAPE effect also differ. Additionally, following constant loads, the enhancement and decay rates of performance in PAPE show varying rates at different times, and these rates do not exhibit a symmetrical linear change in absolute value (Liang, M 2020; Guo, W et al. 2018; Liu, R and Li, Q. 2017). The competition pace in sports demands precise modulation of performance enhancement rates after activation, and athletes can leverage these characteristics by selecting appropriate loading forms to trigger PAPE at critical moments in competition. To explore the enhancement or decay rates of performance over different time domains, our research team designed a protocol consisting of incremental loads.

Conditions

Performance Enhancing Product Use

Keywords

Post-activation performance enhancement; strength training; take-off height; round reaction force; peak power

Outcome Measures

Primary Outcomes (3)

• Ground reaction force

  The ground reaction force of the lower limbs during the half squat jump was measured by the force platform.

  30 seconds, 3 minutes, 6 minutes, 9 minutes, 12 minutes after intervention and before intervention

• Peak Power

  Athletes measured the peak power of the lower limbs in the half squat jump using a force platform

  30 seconds, 3 minutes, 6 minutes, 9 minutes, 12 minutes after intervention and before intervention

• Height

  The athlete uses a 3D motion capture device to measure the height of the highest point of the half squat jump

  30 seconds, 3 minutes, 6 minutes, 9 minutes, 12 minutes after intervention and before intervention

Study Arms (2)

Incremental load training group

EXPERIMENTAL

This training plan is a single training，The load intensity of strength training for athletes :（5,4,3）RM×1 time ×1set for half squat jump

Other: Increasing load strength training

Constant load training group

EXPERIMENTAL

This training plan is a single training，This training plan is a single training，Constant load of strength training for athletes :90%1RM×3 time ×1set for half squat jump

Other: Constant load strength training

Interventions

Increasing load strength training OTHER

The Smith machine was used to intervene with athletes by employing an incremental load approach.

Incremental load training group

Constant load strength training OTHER

The Smith machine was used to intervene with athletes by employing a constant load approach.

Constant load training group

Eligibility Criteria

• Age: 19 Years - 24 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may not qualify if:

• (1) Individuals with a history of lower limb joint injuries; (2) Individuals with cardiovascular diseases, skin allergies, hernia, or any other contraindications; (3) Individuals unwilling to participate in the experiment.

Sponsors & Collaborators

• Universiti Putra Malaysia: lead

Study Sites (1)

RongWenchao

Qinhuangdao, Hebei, 066004, China

Location

Study Officials

• wenchao Rong, phd

  University Putra Malaysia

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Masking Details: Participant, Investigator, Outcomes Assessor
• Purpose: BASIC SCIENCE
• Intervention Model: SEQUENTIAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Study Principal Investigator

Model Details: The experimental group was randomly assigned to receive strength training with increasing loads for post-activation enhancement intervention, while the control group received strength training with constant loads.

Study Record Dates

• First Submitted: June 12, 2024
• First Posted: June 18, 2024
• Study Start: July 18, 2024
• Primary Completion: July 20, 2024
• Study Completion: July 25, 2024
• Last Updated: July 29, 2024

Record last verified: 2024-07

Data Sharing

• IPD Sharing: Will not share

Locations

CN (1)