Post-Activation Potentiation and Jump Performance During and After Ramadan

NCT07812441 | Completed

• 1 other identifier: INONU-PAP-RAM-2022-3042
• Study Type: interventional
• Target: 20
• Locations: 1 country
• Sites: 1

Brief Summary

This study compared the acute effects of two post-activation potentiation protocols on jumping performance in male Muay Thai athletes during and after Ramadan. The investigators examined whether conditioning exercises performed at 60% or 80% of one-repetition maximum produced different effects on countermovement jump height, average power, and peak power. Twenty male Muay Thai athletes were recruited, and 14 athletes completed all required study sessions. Each participant performed both protocols during Ramadan and again after Ramadan. The order of the protocols was randomized and counterbalanced. After a standardized warm-up, participants completed either 10 half-squat repetitions at 60% of one-repetition maximum or 5 half-squat repetitions at 80% of one-repetition maximum. Following a 5-minute recovery period, countermovement jump performance was assessed. The study was designed to determine whether the intensity of the conditioning activity and the Ramadan period were associated with differences in explosive lower-body performance. DETAILED DESCRIPTION This controlled, randomized, counterbalanced crossover study investigated the effects of two post-activation potentiation protocols on countermovement jump performance in male Muay Thai athletes during and after Ramadan fasting. Twenty male Muay Thai athletes were initially recruited. Six participants did not complete all required sessions, and 14 participants completed the study and were included in the analysis. Participants had at least 2 years of Muay Thai training experience and experience participating in national-level competitions. All participants reported that they intended to observe Ramadan fasting during the Ramadan testing period. Each participant attended four experimental sessions. The two conditioning protocols were performed during Ramadan and repeated after Ramadan. Sessions were conducted on non-consecutive days, with approximately 48 hours between testing sessions. The order of the 60% and 80% protocols was randomized and counterbalanced to reduce possible order and learning effects. Testing was generally performed at approximately 5:00 p.m. Before the conditioning activity, participants completed a standardized 5-minute specific warm-up paced by a metronome set at 100 beats per minute. The warm-up included the stationary Spider-Man, inchworm, backward and forward lunge walks, backpedal, and straight-leg skip exercises. The two experimental conditioning protocols were: A single set of 10 half-squat repetitions performed at 60% of the participant's estimated one-repetition maximum. A single set of 5 half-squat repetitions performed at 80% of the participant's estimated one-repetition maximum. One-repetition maximum was estimated during the familiarization session using the Brzycki equation. After completing the assigned conditioning protocol, participants rested for 5 minutes. Countermovement jump performance was then assessed using a force platform. Participants performed three countermovement jumps, with 1 minute of rest between attempts. Participants began and ended each jump in an upright position and kept their hands on their hips throughout the movement. The highest jump performance was used for analysis. The primary performance variables were countermovement jump height, average power, and peak power. Average and peak power were estimated using the Johnson and Bahamonde equations. During the post-Ramadan testing period, participants were instructed to arrive having consumed food at least 3 hours before testing. Participants were also instructed to avoid vigorous exercise and caffeine-containing food or drinks before the experimental sessions. The study evaluated the main effects of Ramadan period and conditioning-protocol intensity, as well as the interaction between these two factors. The study was approved by the Inonu University Clinical Research Ethics Committee under approval number 2022/3042, and written informed consent was obtained from all participants.

Conditions

Athletic Performance; Post-Activation Potentiation

Keywords

Ramadan Fasting; Muay Thai; Post-Activation Potentiation; Countermovement Jump; Explosive Power; Resistance Exercise; One-Repetition Maximum; Athletic Performance

Outcome Measures

Primary Outcomes (3)

• Countermovement Jump Height

  Countermovement jump height was measured in centimeters using a Newtest 2000 force platform. Participants performed three countermovement jumps with 1 minute of rest between attempts while keeping their hands on their hips. The highest jump height recorded during each assessment was used for analysis. Higher values indicate better jump performance.

  5 minutes after the conditioning protocol at each of four experimental sessions: Session 1 during the last 10 days of Ramadan; Session 2, 48 hours after Session 1 during Ramadan; Session 3, approximately 3 weeks after Ramadan; and Session 4, 48 hours aft

• Average Power During Countermovement Jump

  Average power during the countermovement jump was estimated in watts using the Johnson and Bahamonde equation. The calculation was based on the countermovement jump assessment performed after each conditioning protocol. Higher values indicate greater average lower-body power.

  5 minutes after the conditioning protocol at each of four experimental sessions: Session 1 during the last 10 days of Ramadan; Session 2, 48 hours after Session 1 during Ramadan; Session 3, approximately 3 weeks after Ramadan; and Session 4, 48 hours aft

• Peak Power During Countermovement Jump

  Peak power during the countermovement jump was estimated in watts using the Johnson and Bahamonde equation. The calculation was based on the countermovement jump assessment performed after each conditioning protocol. Higher values indicate greater peak lower-body power.

  5 minutes after the conditioning protocol at each of four experimental sessions: Session 1 during the last 10 days of Ramadan; Session 2, 48 hours after Session 1 during Ramadan; Session 3, approximately 3 weeks after Ramadan; and Session 4, 48 hours aft

Study Arms (2)

Sequence 2: 80%-60% 1RM

EXPERIMENTAL

Participants completed the 80% 1RM half-squat conditioning protocol first and the 60% 1RM half-squat conditioning protocol in the subsequent session. Both protocols were performed during Ramadan and repeated after Ramadan, with approximately 48 hours between testing sessions.

Other: 60% 1RM Half-Squat Conditioning Protocol; Other: 80% 1RM Half-Squat Conditioning Protocol

Sequence 1: 60%-80% 1RM

EXPERIMENTAL

Participants completed the 60% 1RM half-squat conditioning protocol first and the 80% 1RM half-squat conditioning protocol in the subsequent session. Both protocols were performed during Ramadan and repeated after Ramadan, with approximately 48 hours between testing sessions.

Other: 60% 1RM Half-Squat Conditioning Protocol; Other: 80% 1RM Half-Squat Conditioning Protocol

Interventions

60% 1RM Half-Squat Conditioning Protocol OTHER

Participants completed a standardized 5-minute specific warm-up paced by a metronome set at 100 beats per minute. They then performed one set of 10 half-squat repetitions at 60% of their estimated one-repetition maximum. After completing the conditioning activity, participants rested for 5 minutes before performing the countermovement jump assessment.

Also known as: 60% Post-Activation Potentiation Protocol

Sequence 1: 60%-80% 1RM; Sequence 2: 80%-60% 1RM

80% 1RM Half-Squat Conditioning Protocol OTHER

Participants completed a standardized 5-minute specific warm-up paced by a metronome set at 100 beats per minute. They then performed one set of 5 half-squat repetitions at 80% of their estimated one-repetition maximum. After completing the conditioning activity, participants rested for 5 minutes before performing the countermovement jump assessment.

Also known as: 80% Post-Activation Potentiation Protocol

Sequence 1: 60%-80% 1RM; Sequence 2: 80%-60% 1RM

Eligibility Criteria

• Age: 18 Years+
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Male Muay Thai athletes.
• At least 2 years of Muay Thai training experience.
• Active participation in national-level Muay Thai competitions.
• Intention to observe Ramadan fasting during the Ramadan assessment period.
• Ability to participate in the familiarization session and all experimental testing sessions.
• Provision of written informed consent.

You may not qualify if:

• Failure to complete all required experimental sessions.
• Inability to perform the half-squat conditioning protocols or countermovement jump assessments.
• Performance of vigorous exercise before an experimental session.
• Consumption of caffeine or caffeine-containing foods or beverages before an experimental session.
• Failure to comply with the study procedures or pre-test instructions.

Sponsors & Collaborators

• Inonu University: lead

Study Sites (1)

Inonu University

Malatya, Turkey (Türkiye)

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Masking Details: No masking was used. Participants and investigators were aware of the conditioning protocol performed during each experimental session.
• Purpose: BASIC SCIENCE
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Associate Professor

Model Details: Participants were assigned to counterbalanced intervention-order sequences. Each participant completed both conditioning protocols, consisting of half squats performed at 60% and 80% of estimated one-repetition maximum, during Ramadan and again after Ramadan. Experimental sessions were conducted on non-consecutive days with approximately 48 hours between sessions.

Study Record Dates

• First Submitted: July 24, 2026
• First Posted: September 10, 2026
• Study Start: April 15, 2022
• Primary Completion: May 23, 2022
• Study Completion: May 23, 2022
• Last Updated: September 10, 2026

Record last verified: 2026-09

Locations

TU (1)