The purpose of this study is to understand acute tendon changes after two exercise programs. We will invite individuals with and without shoulder pain to participate in this study. Every individual will participate in both exercise programs separated by up to 15 days. The researcher will evaluate the shoulder tendon using ultrasound before each exercise program and at 1 hour, 6 hours and 24 hours after each exercise program. The researcher will also evaluate self reported pain, pain sensitivity testing, and self reported questionnaires. We will compare the tendon changes after each exercise program, as well as between participants with and without shoulder pain.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
24
Participants will perform two isotonic exercises, prone shoulder external rotation and shoulder elevation. The exercises will be performed at a pace of 2-second for both concentric and eccentric phases. For each exercise, participants will perform two sets of 8 repetitions, followed by a third set performed until fatigue. Fatigue will be determined using the Repetition in Reserve Scale, which asks the participant to perform exercises until they reach a self-selected number corresponding to the number of repetitions left that a participant could still complete if needed. We will ask participants to continue the third set until they reach a Repetition in Reserve number of 1. The rest period will be 30 seconds between sets and 2 minutes between exercises. The exercise load will be selected after manual maximal isometric strength testing using a handheld dynamometer. A 40% of the strength testing will be used for exercises in both groups following strength guidelines.
Participants will perform two isotonic exercises, prone shoulder external rotation and shoulder elevation. The exercises will be performed at a pace of 1-second for the eccentric phases followed by an explosive concentric phase. For each exercise, participants will perform two sets of 8 repetitions, followed by a third set performed until fatigue. Fatigue will be determined using the Repetition in Reserve Scale, which asks the participant to perform exercises until they reach a self-selected number corresponding to the number of repetitions left that a participant could still complete if needed. Participants will complete the third set until they reach a Repetition in Reserve number of 1. The rest period will be 30 seconds between sets and 2 minutes between exercises. The exercise load will be selected after manual maximal isometric strength testing using a handheld dynamometer. A 40% of the strength testing will be used for exercises in both groups following strength guidelines.
University of Florida
Gainesville, Florida, United States
Supraspinatus tendon thickness
The investigators will use ultrasound to take pictures of the supraspinatus tendons. Established ultrasound procedures will be used to measure supraspinatus tendon thickness.
Time frame: From enrollment to 1 hour, 6 hours, and 24 hours after each exercise program.
Pain sensitivity testing
The investigators will apply pressure at a constant rate using a computerized pressure algometer with a 1 cm diameter rubber tip at the shoulder and the lower limb.
Time frame: From enrollment to 1 hour, 6 hours, and 24 hours after each exercise program.
Self-reported pain
We will use an 11-point numeric pain rating scale to measure the shoulder pain perceived by the participant.
Time frame: From enrollment to 1, 6, and 24 hours after each exercise program.
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