---
title: Are Alterations in Shoulder Rotations and Core Stability Effective for Water Polo Shoulder Problems?
nct_id: NCT04202744
overall_status: UNKNOWN
sponsor: Yeditepe University
study_type: OBSERVATIONAL
primary_condition: Shoulder Injuries
countries: Turkey (Türkiye)
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04202744.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04202744"
ct_last_update_post_date: 2019-12-18
last_seen_at: "2026-05-12T07:22:37.185Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Are Alterations in Shoulder Rotations and Core Stability Effective for Water Polo Shoulder Problems?

**NCT ID:** [NCT04202744](https://clinicaltrials.gov/study/NCT04202744)

## Key Facts

- **Status:** UNKNOWN
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 82
- **Lead Sponsor:** Yeditepe University
- **Collaborators:** Yeditepe University Hospital
- **Conditions:** Shoulder Injuries, Sport Injury, Sports Physical Therapy
- **Start Date:** 2019-03-12
- **Completion Date:** 2020-01-12
- **CT.gov Last Update:** 2019-12-18

## Brief Summary

Hypothesis of the clinical study: There are differences between the Water Polo Group and the Non-Water Polo Group in terms of shoulder parameters and core (lumbopelvic) parameters and there are differences between the throwing and non-throwing sides in terms of shoulder parameters in Water Polo Group.

## Eligibility

- **Minimum age:** 10 Years
- **Maximum age:** 30 Years
- **Sex:** MALE

```
Inclusion Criteria:

* Participating to the study in a voluntary basis.
* Participant in ages between 10-30 years of age.
* Parent permission for participants younger than 18
* Giving consent for older than 18

Exclusion Criteria:

* Having a history of orthopaedic surgery in the shoulder girdle within the last 6 months
* Having a history of fracture within the shoulder girdle complex
* Having a shoulder problem within the last 6 months continuing more than 3 months
* Having a history of pathology in lumbar area within the last 6 months
```

## Arms

- **Water Polo Group** — Participants were active water polo players who train regularly with ages in between 10-30 years.

Five main parameters of the shoulder were assessed: the flexibility of pectoralis minor muscle, tightness of the posterior shoulder capsule, glenohumeral range of motion of internal and external rotation (sum of internal and external rotation: total range of motion), the strength of rotator cuff muscles and scapula position. As core parameters, trunk muscle endurance (flexor, extensor, and laterals) and core stability were evaluated.
- **Non-Water Polo Group** — Participants who do not engage in overhead sports with ages in between 10-30 years.

Five main parameters of the shoulder were assessed: the flexibility of pectoralis minor muscle, tightness of the posterior shoulder capsule, glenohumeral range of motion of internal and external rotation (sum of internal and external rotation: total range of motion), the strength of rotator cuff muscles and scapula position. As core parameters, trunk muscle endurance (flexor, extensor, and laterals) and core stability were evaluated.

## Interventions

- **Shoulder and core evaluations** (OTHER) — Five main parameters of the shoulder were assessed: the flexibility of pectoralis minor muscle, tightness of the posterior shoulder capsule, glenohumeral range of motion of internal and external rotation (sum of internal and external rotation: total range of motion), the strength of rotator cuff muscles and scapula position. As core parameters, trunk muscle endurance (flexor, extensor, and laterals) and core stability were evaluated.

## Primary Outcomes

- **Shoulder Internal and External Rotation Range of Motion Measurement** _(time frame: 5 minutes)_ — Glenohumeral rotations were assessed with the subject lying supine with their shoulder in 90° abduction, 90° elbow flexion and the forearm pronated. Shoulder and elbow alignment were provided with the help of the towel. For external rotation, the goniometer's axis was placed on olecranon process of ulna, the stationary arm was placed perpendicular to the floor and moving arm was placed on ulnar border of forearm toward ulnar styloid process. For internal rotation, the goniometer's axis was positioned on the same area. Then, its stationary arm was positioned perpendicular to the floor and the moving arm was placed on ulnar border of forearm toward ulnar styloid process. The angle was recorded in degrees, three trials were performed and the average taken. Subjects were evaluated by the same physiotherapist to control measurement error.
- **Posterior Shoulder Capsule Tightness** _(time frame: 5 minutes)_ — Goniometer measurement of horizontal adduction (Add) angle was used for Posterior shoulder tightness (PST). Shoulder was 90° of abduction (Abd) and elbow was flexed 90° of flexion in supine position. The scapula was stabilized using the thenar part of hand on the lateral edge of the scapula and the other hand was used to move the arm in horizontal Add. The goniometer's axis was placed on Acromioclavicular joint (ACJ), the stationary arm was directed parallel to the ground and the goniometer's mobile arm was placed on lateral epicondyle of the humerus. No scapular protraction and elevation were allowed. Shoulders with a smaller horizontal abduction angle showed a stiffness of posterior capsule.
- **Shoulder Strength Assessment** _(time frame: 10 minutes)_ — Maximum isometric shoulder rotation strengths were evaluated using a hand-held dynamometer (HHD) with all measurements recorded in newton meter. The arm was positioned at 45° of abduction, elbow was flexed to 90° and shoulder was at 30° of horizontal adduction. For evaluation of internal rotation strength, the HHD was located on the volar side of the wrist 2 cm proximal to the radial styloid and on the dorsal aspect for testing of external rotation strength. To evaluate external rotation strength, the subject was instructed to externally rotate the examining shoulder against HHD while the humerus was stabilized; under same circumstances to measure internal rotation strength the subject was instructed to internally rotated. Subjects were instructed to perform isometric contraction for 5 seconds during the test. Between maximal isometric contractions, 30 seconds of resting intervals were given. The average values of the three trials were taken.
- **Trunk Muscles Endurance Test - (McGill Trunk Endurance Test)** _(time frame: 15 minutes)_ — For endurance of the trunk extensors, subjects were positioned in prone lying with spina iliaca anterior superior level over the edge of the treatment table and their body were stabilized by straps. The upper body was supported by hands before initiation of the test. With the initiation of the test, hands were crossed across their chest and start to keep their upper body parallel to the ground. During the test, participants were instructed to maintain the horizontal position as long as possible. For trunk lateral flexors, subjects were side-lying position on the exercise mat with extended legs and arm must be in full contact with the body. As soon as the participants lift the hips, the test was initiated. Subjects were instructed to maintain a straight line along with the vertebrae by controlling lateral flexor muscles of the trunk as long as possible. The lateral flexors were assessed on both sides.

## Secondary Outcomes

- **Shoulder Pectoralis Minor Muscle Length** _(time frame: 5 minutes)_
- **Sahrmann Core Stability Test** _(time frame: 10 minutes)_

## Locations (1)

- Yeditepe University, Istanbul, Turkey (Türkiye)

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `outcomes.secondary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `sponsor.collaborators` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.yeditepe university|istanbul||turkey (türkiye)` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT04202744.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT04202744*  
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