Effectiveness of a Quick Release Dynamic Muscle-strengthening Program on Dynamic Stabilization of the Cervical Spine
NCT Number: NCT06545006
Acronym: CERVITRAIN
Status: ENROLLING_BY_INVITATION
Study Type: INTERVENTIONAL
Phases: NA
Conditions: Rugby|Craniocerebral Trauma|Cervical Spine Injury|Stabilization
Interventions: OTHER: isometric contractions|OTHER: stroboscopic glasses|OTHER: Quick Release
Sponsor: University Hospital, Montpellier
Collaborators: Université Montpellier
Sex: ALL
Age: ADULT, OLDER_ADULT
Enrollment: 50
Study Design: Allocation: RANDOMIZED|Intervention Model: PARALLEL|Masking: SINGLE (INVESTIGATOR)|Primary Purpose: PREVENTION
Start Date: 2024-08-05
Completion Date: 2025-05-05
Locations: EuroMov Université de Montpellier, Montpellier, Herault, 34 090, France

Summary:
The goal of this clinical trial is to learn if Quick Release dynamic strengthening of the cervical spine extensor muscles' reflex could improve dynamic stabilisation capacities of the cervical spine by reducing muscle activation delay in amateurs rugby players. The main questions it aims to answer are described as follows:

The primary outcome measure is the comparison between the intervention and control groups of the variation in activation delay of the cervical spine extensor muscles in milliseconds (ms) between the beginning and the end of the strengthening program. The activation delay in milliseconds corresponds to the time between the onset of impact application on the head and the onset of reactive muscle force production measured by the Cervistab© ergometer.

The secondary outcomes are also a comparison between the two groups of the variations from the beginning to the end of the strengthening program for the followings parameters, measured during with the Cervistab© machine:

* Reflex Force Production Rate (N/ms): slope of the force/time graph.
* Maximum Reactive Force (N): maximum force value produced within 300 ms following impact.
* In both intervention groups: measurement of the variation in head displacement (in mm) during quick release strengthening protocol.
* In each subgroup, 10 participants will be equipped with Instrumented Mouthguards. Researchers will compare the variation in workload measured by these mouthguards during Cervistab evaluations conducted before and after the training protocol.

Researchers will compare the intervention group to a distractor (control) arm to see if our training protocol has an impact on the activation delay.

Primary Outcome Measures: Comparison of the activation delay, the time between the onset of impact application on the head and the onset of reactive muscle force production (in miliseconds)

comparison between the intervention and control groups of the variation in muscle activation delay of the cervical spine extensors (in ms) between the start and the end of the strengthening program. The activation delay in ms corresponds to the time between the start of the application of impact to the head and the start of production of reactive muscle force during the test on the Cervistab© ergometer., Baseline and at end (week 6)
Secondary Outcome Measures: Rate of Reflex Force Production, Comparison between the 2 groups of the variations between the beginning and the end of the reinforcement program, of the following parameter : slope of the force/time graph in newton per miliseconds, Baseline and at end (week 6)|Maximum Reactive Force, Comparison between the 2 groups of the variations between the beginning and the end of the reinforcement program, of the following parameter : maximum force value produced within 300 ms following impact in newton, Baseline and at end (week 6)|Workload, In each subgroup of 10 participants equipped with Instrumented Mouthguards, we will compare the variation in Workload measured by these mouthguards during Cervistab evaluations conducted before and after the training protocol.(in G), Baseline and at end (week 6)