---
title: Lateral Neck Flexor Endurance and Hyperlaxity
nct_id: NCT04770987
overall_status: COMPLETED
sponsor: University of Hartford
study_type: OBSERVATIONAL
primary_condition: Physical Endurance
countries: United States
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04770987.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04770987"
ct_last_update_post_date: 2021-07-22
last_seen_at: "2026-05-12T06:38:43.213Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Lateral Neck Flexor Endurance and Hyperlaxity

**Official Title:** Lateral Neck Flexor Endurance in Individuals With and Without Systemic Hyperlaxity

**NCT ID:** [NCT04770987](https://clinicaltrials.gov/study/NCT04770987)

## Key Facts

- **Status:** COMPLETED
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 60
- **Lead Sponsor:** University of Hartford
- **Conditions:** Physical Endurance, Hypermobility, Joint, Muscular Weakness
- **Start Date:** 2021-02-26
- **Completion Date:** 2021-07-16
- **CT.gov Last Update:** 2021-07-22

## Brief Summary

The lateral neck flexor endurance test has been proposed to assess for unilateral muscular deficits. It is not known if individuals with hyperlaxity have different muscular endurance than individuals without hyperlaxity.

## Detailed Description

Thirty individuals with systemic hyperlaxity as determined with the Beighton scale will be assessed for lateral neck flexor endurance and compared to age and gender matched controls. Basic demographic information will be collected, and all individuals will report Neck Disability Index (NDI) and Numeric Pain Rating Scales (NPRS) for their neck, as well duration of any neck pain. All participants will then undergo testing of lateral neck flexor muscle endurance, repeated twice on each side. Average hold times will be compared for individuals with hyperlaxity (5 or greater on Beighton scale) and the healthy age and gender matched controls. Analysis will also include covariates of NDI scores, pain scores, and chronicity of symptoms.

## Eligibility

- **Minimum age:** 18 Years
- **Maximum age:** 60 Years
- **Sex:** ALL
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

systemic hyperlaxity of 5 or greater on Beighton Index, healthy age/gender matched controls

Exclusion Criteria:

* neck pain that spreads into the arms;
* whiplash injury within the last 6 weeks;
* diagnosed neuropathy or other nervous system disorders;
* a history of spinal surgery in their neck;
* fibromyalgia;
* insulin dependent diabetes;
* involved in legal activity regarding neck pain
```

## Arms

- **hyperlaxity** — 30 individuals with systemic hyperlaxity as defined by a score of 5 or greater on the Beighton Hypermobility Scale
- **control** — 30 healthy, age and gender matched individuals without hyperlaxity

## Interventions

- **lateral neck flexor endurance test** (OTHER) — Individuals will maintain the head in a neutral position off the ground in sidelying for as long as possible.

## Primary Outcomes

- **lateral neck flexor endurance** _(time frame: single testing session at enrollment)_ — maximum hold time

## Secondary Outcomes

- **Beighton Hyperlaxity Scale** _(time frame: at enrollment)_
- **Neck Disability Index** _(time frame: at enrollment)_
- **Numeric pain rating scale** _(time frame: at enrollment)_

## Locations (1)

- University of Hartford, West Hartford, Connecticut, United States

## 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)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.university of hartford|west hartford|connecticut|united states` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT04770987.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT04770987*  
*This page is a raw mirror with no AI summary, no editorial enrichment, and no Parkinson's-specific filtering.*