Unstable Loaded Plyometric Training

Comparison of the Effects of Unstable and Stable Loaded Plyometric Training on Some Physical Fitness Factors in Pas Gorgan Volleyball Team Players

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

IRCT

Registry ID

IRCT20250905067129N2

Enrollment

Registered

2026-04-21

Start date

2026-05-05

Completion date

Unknown

Last updated

2026-06-01

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

Conditions

Volleyball players' performance.

Interventions

Intervention 1: Intervention group 1: Participants in this group performed unstable loaded plyometric exercises equivalent to 10% of body weight over a 12-week period (three sessions per week, a total

Eligibility

Sex/Gender

Male

Age

18 Years to 28 Years

Inclusion criteria

Inclusion criteria: Age range: 18-28 years sports history of participating in league competitions for at least 2 years, ability to jump vertically at least 45 cm be completely medically healthy and have no problems performing sports related to the research have no cardiovascular problems Avoid using stimulants and certain medications (steroids). Player of the Gorgan Pas volleyball team

Exclusion criteria

Exclusion criteria: History of acute or chronic musculoskeletal injuries/disorders of the ankles, knees, or back History of cardiovascular disease and problems in the participant. Taking steroid medications. Tobacco and alcohol consumption

Design outcomes

Primary

Measure	Time frame
Sargent's jump height. Timepoint: 1. Initial measurement (pre-test) of Sargent jump height in week 0, before the start of training 2; Intermediate measurement at the end of week 4, 48 hours after the last training session, 3. Intermediate measurement at the end of week 8, 48 hours after the last training session, 4. Final measurement (post-test) at the end of week 12, 48 hours after the last training session. Method of measurement: For the Sargent jump height, hand height is initially assessed in a straight standing position with both feet in a lateral position close to the wall, the arm of the dominant hand fully extended in a vertical direction, and the fingers touching a wall-mounted tactile sensor connected to a digital display (Sargent Jumping Device, Danesh Salar Iranian, Iran). After that, participants perform a reverse movement (i.e., knee and hip flexion) with an arm swing immediately after a rapid and powerful vertical jump. The participants’ task is to touch the scale mounted on the wall with their middle finger while flying at the highest position.	—

Measure

Time frame

Sargent's jump height. Timepoint: 1. Initial measurement (pre-test) of Sargent jump height in week 0, before the start of training 2; Intermediate measurement at the end of week 4, 48 hours after the last training session, 3. Intermediate measurement at the end of week 8, 48 hours after the last training session, 4. Final measurement (post-test) at the end of week 12, 48 hours after the last training session. Method of measurement: For the Sargent jump height, hand height is initially assessed in a straight standing position with both feet in a lateral position close to the wall, the arm of the dominant hand fully extended in a vertical direction, and the fingers touching a wall-mounted tactile sensor connected to a digital display (Sargent Jumping Device, Danesh Salar Iranian, Iran). After that, participants perform a reverse movement (i.e., knee and hip flexion) with an arm swing immediately after a rapid and powerful vertical jump. The participants’ task is to touch the scale mounted on the wall with their middle finger while flying at the highest position.

—

Secondary

Measure	Time frame
Depth jump. Timepoint: 1. Initial measurement (pre-test) of Sargent jump height in week 0, before the start of training 2; Intermediate measurement at the end of week 4, 48 hours after the last training session, 3. Intermediate measurement at the end of week 8, 48 hours after the last training session, 4. Final measurement (post-test) at the end of week 12, 48 hours after the last training session. Method of measurement: The depth jump is performed by landing from a 40 cm box on firm ground and immediately jumping as high as possible. Participants are instructed to touch a scale mounted on the wall during the flight at the highest point. The jump height is defined as the difference between the height of the hand in the standing position and the height of the hand in the jumping position.;Standing long jump. Timepoint: 1. Initial measurement (pre-test) of standing long jump in week 0, before the start of training; 2. Intermediate measurement at the end of week 4, 48 hours after the last training session; 3. Intermediate measurement at the end of week 8, 48 hours after the last training session; 4. Final measurement (post-test) at the end of week 12, 48 hours after the last training session. Method of measurement: To measure horizontal explosive power of the lower limbs, the subject will stand on the ground behind a designated starting line with both feet together. After a warm-up movement involving bending the knees and swinging the arms, the subject will jump forward with maximum force and attempt to cover as much distance as possible. The landing must be done with both feet simultaneously within the landing area. The distance from the front edge of the starting line to the heel of the foot closest to the landing area will be measured in centimeters using an accurate tape measure. Each subject will make three valid attempts and the best record will be recorded as the final result. A 2-minute rest period will be given between each attempt. Attempts in which the subje	—

Measure

Time frame

Depth jump. Timepoint: 1. Initial measurement (pre-test) of Sargent jump height in week 0, before the start of training 2; Intermediate measurement at the end of week 4, 48 hours after the last training session, 3. Intermediate measurement at the end of week 8, 48 hours after the last training session, 4. Final measurement (post-test) at the end of week 12, 48 hours after the last training session. Method of measurement: The depth jump is performed by landing from a 40 cm box on firm ground and immediately jumping as high as possible. Participants are instructed to touch a scale mounted on the wall during the flight at the highest point. The jump height is defined as the difference between the height of the hand in the standing position and the height of the hand in the jumping position.;Standing long jump. Timepoint: 1. Initial measurement (pre-test) of standing long jump in week 0, before the start of training; 2. Intermediate measurement at the end of week 4, 48 hours after the last training session; 3. Intermediate measurement at the end of week 8, 48 hours after the last training session; 4. Final measurement (post-test) at the end of week 12, 48 hours after the last training session. Method of measurement: To measure horizontal explosive power of the lower limbs, the subject will stand on the ground behind a designated starting line with both feet together. After a warm-up movement involving bending the knees and swinging the arms, the subject will jump forward with maximum force and attempt to cover as much distance as possible. The landing must be done with both feet simultaneously within the landing area. The distance from the front edge of the starting line to the heel of the foot closest to the landing area will be measured in centimeters using an accurate tape measure. Each subject will make three valid attempts and the best record will be recorded as the final result. A 2-minute rest period will be given between each attempt. Attempts in which the subje

—

Countries

Iran (Islamic Republic of)

Contacts

Public ContactParsa Soltani

National Elite Foundation

par.soltani@mail.sbu.ac.ir+98 21 8872 8937

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Jun 11, 2026