Clinical trial NCT04744246: Muscle Activity During Load Carriage in ROTC Cadets
Official title: An Analysis of Muscle Activity During Load Carriage Activity in Army ROTC Cadets
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Back Pain
Lead sponsor: North Dakota State University
Sponsor class: OTHER
First posted: 2021-02-08
Enrollment: 30
Sex: ALL
Minimum age (years): 18
Maximum age (years): 35
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: FACTORIAL
Primary purpose: SCREENING

Brief summary: Army ROTC Cadets who are currently enrolled in Military Science courses will be asked to participate in this experimental research design. A total of 30 healthy cadets consisting of approximately 24 males and six females will be recruited, as this will provide an accurate representation of the overall Army demographics with 17% being female.

Paperwork: After providing consent, participants age and gender will be documented, and height and weight will be measured and documented. Participants will complete a modified version of the Modified Oswestry Low Back Pain Disability Questionnaire, which has been adjusted to be more specific to the military population. The questionnaire will be filled out indicating the cadet's current level of pain. They will then complete the same questionnaire indicating their pain within the last year.

Protocol: First, the skin will be prepared and surface electromyography (EMG) electrodes will be placed. Dynamic, surface EMG data will be obtained of the gluteus medius, gluteus maximus, erector spinae, rectus femoris, and biceps femoris muscles in accordance with SENIAM (Surface Electromyography for the Non-Invasive Assessment of Muscles) guidelines. Skin preparatation will consist of trimming hair if the skin surface at which the electrodes have to be placed is covered with hair. Next, the skin will be cleaned with alcohol. The skin will be allowed to dry prior to electrode placement. Lastly, skin will be abraded to reduce impedance. Following electrode application, participants will complete five minutes of light activity on a bike or treadmill for warm-up. Next, in order to normalize the data, manual muscle tests will be performed for each of the six muscles being test. Then, participants will walk at a speed of four miles per hour for 10 seconds as a dynamic measurement for normalizing the data.

After completion of the two normalization protocols, participants will complete a five kilometer (3.1 mile) walk on a treadmill at a speed of three miles per hour, with and without a 35 lb. load carried in a traditional rucksack. The load conditions will be randomized and counterbalanced in order to mitigate effects of fatigue, and the conditions will be performed in two separate sessions (separated by 24-48 hours).


Eligibility criteria: Inclusion Criteria:

* current enrollment in military science courses and member of Army ROTC

Exclusion Criteria:

* current musculoskeletal injuries

Primary outcomes:
measure: EMG change over time with Load carriage
timeFrame: 2 days
measure: EMG change over time without load
timeFrame: 2 days
measure: Modified version of Modified Oswestry Disability Index Current Pain
timeFrame: 1 day
measure: Modified version of Modified Oswestry Disability Index Pain in Last Year
timeFrame: 1 day
Secondary outcomes:
Other outcomes:
Locations:
city: Fargo
country: United States
facility: North Dakota State University
state: North Dakota
Study officials:
References: