Impact of Fatigue on Jumping Performance

Study Overview
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Brief Summary
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The purpose of this study will be to determine the effects of a 2-minute single limb lateral step-down fatigue test versus a 30 second side hop test on single limb forward hop distance.

Detailed Description
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Current methods to induce fatigue often incorporate equipment not available in all clinical settings or include tasks that are difficult to standardize. One of the tests to fatigue the leg muscles is the leg extensor fatigue test using a unilateral weight machine. There are drawbacks to this testing including the clinician having access to the equipment, testing only fatigued a single muscle group, and it is less sport/task specific compared to jump testing. Our previous work has incorporated the use of a side hop task that is performed by hopping over two lines 40 cm apart for 30 seconds. While this does induce fatigue and decreases single leg forward hop performance the overall decrease was relatively small (<10 cm). It is likely necessary to induce a greater amount of fatigue; thus further limiting single leg forward hop performance.

Official Title
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Impact of Fatigue on Jumping Performance

Conditions
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Healthy

Intervention / Treatment
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* Other: Step-Down Test (2 min)
* Other: Side hop test (30 s)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: No history of knee surgery Tegner score >5 Exclusion Criteria: Participants with traumatic spine or lower extremity injury within past 6 months Participants who are unable to give consent or are unable to understand procedures of experiment

Ages Eligible for Study
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Minimum Age: 19 Years
Maximum Age: 40 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: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Exercise: step-down test (2 min)<br>The 2-minute single limb lateral-step down test will be used to induce lower extremity muscle fatigue. Participants will be instructed to perform a single limb lateral step-down test on a 31 cm box (12-inches), touching their heel to the floor each time as many times as possible in 2 minutes. The number of lateral step-downs will be recorded. | Other: Step-Down Test (2 min)<br>* The 2-minute single limb lateral-step down test will be used to induce lower extremity muscle fatigue. Participants will be instructed to perform a single limb lateral step-down test on a 31 cm box (12-inches), touching their heel to the floor each time as many times as possible in 2 minutes. The number of lateral step-downs will be recorded.<br>|
| Experimental: Exercise: side hop test (30 s)<br>The 30 second side hop test will be used to induce lower extremity muscle fatigue. Participants will be instructed to jump as many times as possible over two parallel strips of tape placed 40 cm apart, but must initiate approximately 30 degrees of knee flexion each jump. The number of successful jumps performed within 30 seconds will be recorded and used for data analysis. An unsuccessful jump will be defined as touching the tape or the area inside the tape. We will record the number of successful trials. | Other: Side hop test (30 s)<br>* The 30 second side hop test will be used to induce lower extremity muscle fatigue. Participants will be instructed to jump as many times as possible over two parallel strips of tape placed 40 cm apart, but must initiate approximately 30 degrees of knee flexion each jump. The number of successful jumps performed within 30 seconds will be recorded and used for data analysis. An unsuccessful jump will be defined as touching the tape or the area inside the tape. We will record the number of successful trials.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Single limb hop distance (cm) | While standing on one leg participants will be instructed to hop as far forward as possible with a controlled single limb landing. | Change from baseline single limb hop distance immediately after fatigue exercise | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Side Hop, Forward Hop, Step test, Vertical Jump