Sleeper Stretch in CrossFit Participants

The Effects of a Sleeper Stretch Intervention on Measures of Performance and Pain in CrossFit Participants: A Randomized Trial

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT06720155

Enrollment

Registered

2024-12-06

Start date

2025-05-15

Completion date

2025-09-30

Last updated

2025-10-22

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Shoulder Pain

Keywords

CrossFit, Sleeper stretch

Brief summary

The purpose of this study is to compare the efficacy of the sleeper stretch in improving shoulder range of motion, strength and upper body performance in CrossFit athletes.

Interventions

BEHAVIORALSleeper stretch

Participants will complete their regularly scheduled workout activities over 8 weeks, with the addition of the sleeper stretch into the dynamic warm-up. Participants will be instructed to lie side-lying with the dominant arm downward, the trunk rotated posteriorly 20 to 30°, the shoulder raised to 90°, the elbow flexed to 90°, and both knees semi-flexed to ensure stability. Participants will then be asked to use the opposite hand to grasp the dominant hand below the wrist and gradually internally rotate the forearm towards the floor; (i.e., the participant will perform passive internal rotation with the opposite arm). This stretch position will be completed on both sides. Participants will be instructed to complete 2 sets of 10 repetitions for each arm and hold the position for \ 2 seconds.

BEHAVIORALStandard workout

Participants will complete their regularly programmed dynamic warm-ups before scheduled workout for 8 weeks.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to 55 Years

Healthy volunteers

Yes

Inclusion criteria

• Regularly active (attending CrossFit \> 2x per week)

Exclusion criteria

* Positive test for labral lesions or rotator cuff tears * History of recent fracture * Orthopedic surgery in the upper limbs or cervical region * Any other current injury that would prevent participation in regular work-shift activities

Design outcomes

Primary

Measure	Time frame	Description
Upper body function	Baseline, 4 weeks, 8 weeks	Measured by isometric horizontal push test (IHPT), a newly designed test that selectively measures the horizontal component of maximal isometric force, with 3 minutes of rest between each trial. The participants will place their hands on force platforms that sample ground reaction force data at 1000 Hz throughout the test.

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026