Impact of Fatigue on Jumping Performance

Creighton University

Status: Completed

Conditions: Healthy

Treatments: Other: Side hop test (30 s); Other: Step-Down Test (2 min)

Study type: Interventional

Funder types: Other

Identifiers

NCT03133078

959318

Details and patient eligibility

About

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.

Full description

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.

Enrollment: 20 patients

Sex: All

Ages: 19 to 40 years old

Volunteers: Accepts Healthy Volunteers

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

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: None (Open label)

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20 participants in 2 patient groups

Exercise: step-down test (2 min)

Experimental group

Description:

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.

Treatment:

Other: Step-Down Test (2 min)

Exercise: side hop test (30 s)

Experimental group

Description:

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.

Treatment:

Other: Side hop test (30 s)