Effects of Eccentric Potentiation Activation on Muscle Function

Study Overview
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Brief Summary
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The purpose of this study is to examine the potentiation effects of 2 sets of multi-joint eccentric overload maximal contractions on muscle function.

Official Title
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Effects of Multi-joint Eccentric Potentiation Maximal Contractions on Muscle Function

Conditions
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Post Activation Potentiation

Intervention / Treatment
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* Other: Eccentric Exercise
* Other: Cycle ergometer


Participation Criteria
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Eligibility Criteria
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Exclusion Criteria: lower body surgery or injury in the last 12 months have any neuromuscular disease height >76 inches tall height <54 inches tall eccentric strength greater than 725 pounds pregnant or plan to be pregnant in the duration of the protocol don't do resistance exercise at least once per week perform intense cardio or strength training >4 days per week Present with any other significant comorbid conditions that would impair the ability to participate in the exercise-based testing Inclusion criteria: 18 - 30 years old strength train lower body 1-3 times per week

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 30 Years

Sexes Eligible for Study
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All

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: Following a familiarization session, subjects will be assigned to an order for performing both an eccentric and a cycle (sham) session (i.e., crossover design, the order being randomized). These will be performed 3-7 days apart.
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Cycling exercise<br>Cycling on a cycle ergometer instead of doing the experimental eccentric exercise. | Other: Cycle ergometer<br>* Individuals will do a randomized crossover intervention involving cycling (active control) exercise<br>|
| Experimental: Eccentric exercise<br>Perform 2 sets of maximal eccentric contractions as the single session exercise intervention. | Other: Eccentric Exercise<br>* Individuals will do a randomized crossover intervention involving maximal eccentric contractions (2 sets of 6 per leg; experimental condition)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Vertical Jump | 3 countermovement vertical jumps, with 30 seconds of rest between attempts | Baseline (pretest) | 
| Vertical Jump | 3 countermovement vertical jumps, with 30 seconds of rest between attempts | Immediately post intervention | 
| Vertical Jump | 3 countermovement vertical jumps, with 30 seconds of rest between attempts | 12 minutes post intervention | 
| Vertical Jump | 3 countermovement vertical jumps, with 30 seconds of rest between attempts | 20 minutes post intervention | 
| Isokinetic eccentric maximal strength | Maximal eccentric strength on the Eccentron machine. 2 repetitions per time point | Baseline (pretest) | 
| Isokinetic eccentric maximal strength | Maximal eccentric strength on the Eccentron machine. 2 repetitions per time point | Immediately post intervention | 
| Isokinetic eccentric maximal strength | Maximal eccentric strength on the Eccentron machine. 2 repetitions per time point | 12 minutes post intervention | 
| Isokinetic eccentric maximal strength | Maximal eccentric strength on the Eccentron machine. 2 repetitions per time point | 20 minutes post intervention |