Cervical Changes by 4h of Hyper-buoyancy Flotation and Followed by 15 Mins 1g Re-loading

Cervical Intervertebral Disc Expansion, Vertebral Compliance Reduction and Neck Pain is Induced by 4h of Hyper-buoyancy Flotation That is Only Partially Reversed by 15 Mins 1g Re-loading

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT05296200

Enrollment

Registered

2022-03-25

Start date

2020-03-13

Completion date

2022-02-10

Last updated

2022-03-25

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

Conditions

Intervertebral Disc Herniation, Stiffness; Spine

Brief summary

Study with the aim to see the effect on a space ground anaologue, Hyperbuoyancy Floatation (HBF) on cervical column.

Detailed description

the aim of the study is to determine the effect of 4h HBF and subsequent passive 1g axial loading upon stature, cervical IVD height) cervical muscle (Longus Collis and Semispinalis Cervicis) thickness and CSA assessed with ultrasound, cervical vertebral compliance, their relationships to induced stature increments and neck pain.

Interventions

DEVICEHyperbuoyancy Floatation

Subjects are laid supine upon a HBF waterbed encased within a wooden frame partially (50%) filled with water (at 36ºC to maintain thermal comfort) super-saturated with magnesium sulphate. Thus, subjects are buoyant, sinking passively into the bed in proportion to their segmental mass.

Study design

Observational model

CASE_CONTROL

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to 65 Years

Inclusion criteria

* physical requirements (1.57-1.90m, 50-95kg)

Exclusion criteria

* current back/neck pain, musculoskeletal disorder, cardiovascular disease, spine surgery and being, or suspected to be pregnant

Design outcomes

Primary

Measure	Time frame	Description
Height	up to 2 years	Standing stature measured by a commercial stadiometer (Seca 217, Germany)

Secondary

Measure	Time frame	Description
Height of cervical Intervertebral Discs	up to 2 years	Disc height (C3-T1) measured by ultrasound (Samsung HS40, South Korea)
Longus Collis and Semispinalis Cervicis thickness and cross-sectional area.	up to 2 years	Neck flexor (Longus Collis) and Neck extensor (Semispinalis Cervicis) were assessed by ultrasound (Samsung HS40, South Korea) and their respective muscle thickness and cross-sectional area was calculated.
Vertebral Stiffness	up to 2 years	Vertebral stiffness from C0 to L5 was assessed passively (in the prone position) with a handheld differential vertebral compliance transducer (PulStar, Sense Technology Inc., USA) in Newtons.
Self-reported neck pain	up to 2 years	Pain rating scale (CHAPS) from 0 to 10

Countries

Spain

Outcome results

None listed

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