Post - Activation Potentiation After Plyometric and Heavy Resistance Exercise in Soccer Players

Study Overview
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Brief Summary
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The main purpose of this study will be comparison of acute effects of plyometric and heavy resistance exercise on post-activation potentiation

Detailed Description
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This is a single-center, randomized, crossover study. Collegiate soccer players will be enrolled in this study. The study will be performed in 3 separate sessions.In the first session, participants will be familiarized with the experimental conditions and 1RM will be calculated. Participants will then be randomized to receive either heavy resistance or plyometric exercise first in the second session and then will be crossed over to receive the opposite intervention in the third session. The objective of the study is to compare the acute effects of plyometric and heavy resistance exercise on post - activation potentiation by measuring physical performance and blood lactate level.

Official Title
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Post - Activation Potentiation Following Acute Bouts of Plyometric Versus Heavy Resistance Exercise in Collegiate Soccer Players

Conditions
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Soccer

Intervention / Treatment
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* Behavioral: Plyometric exercise
* Behavioral: Heavy resistance exercise


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Collegiate soccer players aged 18 - 26 years Participants must have at least 2 years of playing experience Participants should be involved in sport-specific training on at least 2 occasions per week and play competitively once per week Exclusion Criteria: Lower extremity reconstructive surgery in last 24 months or unresolved musculoskeletal disorder which would prohibit subject to participate in the sport. Participants who are consuming (or had consumed) growth hormone, anabolic steroids or any kind of performance enhancing drugs.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 26 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Crossover Assignment
Interventional Model Description: Randomized crossover design
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Plyometric-Resistance<br>This group will perform plyometric exercise first and then heavy resistance exercise | Behavioral: Plyometric exercise<br>* 2 sets of 10 ankle hops, 3 sets of 5 hurdle hops, 5 drop-jumps from a height of 50 cm<br>Behavioral: Heavy resistance exercise<br>* 10 single repetitions of back half squats at 90% of 1 repetition maximum<br>|
| Experimental: Resistance-Plyometric<br>This group will perform resistance exercise first and then plyometric exercise | Behavioral: Plyometric exercise<br>* 2 sets of 10 ankle hops, 3 sets of 5 hurdle hops, 5 drop-jumps from a height of 50 cm<br>Behavioral: Heavy resistance exercise<br>* 10 single repetitions of back half squats at 90% of 1 repetition maximum<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Blood lactate level | Small pinprick blood samples will be taken from fingertip and blood lactate level will be measured by Blood lactate analyser (EKF Diagnostic Lactate Scout +, UK). The area will be cleaned first, using a dry tissue to remove sweat, then an alcohol swab. Once the area is dry, the lancet (often with a spring loaded apparatus) will be used to pierce the skin. | Measured prior to and after the intervention period (at 1 minute and 10 minute) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Countermovement jump height | The countermovement jump height will be measured using an iPhone app 'My Jump'. Jump height will be determined using an acknowledged flight - time calculation. During the CMJ, the subject rest their hands on their hips while performing a downward movement, followed by a maximum effort vertical jump. The subjects have to land in an upright position and to bend knees on landing. | Measured prior to and after the intervention period (at 1 minute and 10 minute) | 
| 20 m single sprint time | The 20m single sprint is a standard test for assessing soccer players' running speed. The test involves running a single maximum sprint over 20 meters, with the time recorded using a stopwatch. | Measured prior to and after the intervention period (at 1 minute and 10 minute) |