Effect of Dynamic Sitting on Pain Development - Part 2 (DynSit-Pain 2)

University of Applied Sciences for Health Professions Upper Austria

Status: Enrolling

Conditions: Lower Back Pain

Treatments: Device: Dynamic office chair (saddle chair with standard pendulum mechanism); Device: Dynamic Office Chair (office swivel chair with integrated newly developed pendulum mechanism)

Study type: Interventional

Funder types: Other

Identifiers

NCT07197879

2025-05-12

Details and patient eligibility

About

As a follow-up project to the Dyn-Sit-Pain study, this research aims to investigate the overall health as well as the physical and mental well-being through dynamic office chairs. The development of an innovative dynamic office chair concept will be professionally and scientifically supported, and the developed prototypes will be examined within the framework of usability studies.

Full description

This clinical trial is a prospective, randomised, controlled, open-label study with two tracks, each in a cross-over design investigating the effect of of two dynamic office chairs (saddle chair with standard pendulum mechanism [Smart Moving Technology], study track 2 = office swivel chair with integrated newly developed pendulum mechanism [Smart Moving Technology New]) on the musculoskeletal system of office workers classified as pain developers.

The study consists of a pre-screening visit and 4 assessment days / visits. After proving eligibility for the study (inclusion/exclusion criteria), subjects are assigned to one of the two study tracks. Subjects are randomised to one of the two study tracks and then to the respective group (Group A to D).

• Study track 1: saddle chair with standard pendulum mechanism (= intervention 1) + static office chair (= control)
• Study track 2: office swivel chair with integrated newly developed pendulum mechanism (= intervention 2) + static office chair (= control).

Depending on the study track and group allocation, the test subjects first receive a dynamic office chair (= intervention) or a static office chair (= control). The randomization will be realized with opaque envelopes in different colours and follows international recommendations.

Overall participants will execute identical assessments. A wash-put period between the control and the intervention phases ensures identical baseline conditions. The overall duration of study participation equals 16 weeks.

Enrollment: 20 estimated patients

Sex: All

Ages: 18 to 65 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Signed Informed consent
• People aged between 18 and 65 years
• People classified as pain developers (e.g.: a 10 mm increase in pain on a 100 mm paper-based VAS)
• Office workers
• Employment status: > 25 h / week
• Sufficient knowledge of German (min. B2 level)
• Body height of at least 160cm required
• Electrically or manually height-adjustable table at main workstation

Exclusion criteria

• Physical or mental limitations that make dynamic sitting or use of the procedure chair difficult (e.g. wheelchair users, vestibular dysfunction)
• Pregnancy
• Sitting for less than 20 hours per week at the main workplace
• Body weight over 110 kg and a body height over 195 cm
• Regular therapy or medication for pain or medication that affects the perception of pain (e.g. certain psychotropic drugs according to the package leaflet)
• office chair to which it is not possible to attach the swivel mechanism prototype
• Presence of any chronic disease that may influence pain perception (e.g., chronic kidney disease, fibromyalgia, neuropathy, chronic fatigue syndrome)

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: None (Open label)

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20 participants in 4 patient groups

Study Track 1: Group A

Experimental group

Description:

The pre-existing static office chair will be used in the personal workplace for the first 6 weeks within the first half of the study. A wash-out period of a minimum of 4 weeks will be executed after the first half of the study. A dynamic office chair (saddle chair with standard pendulum mechanism) will be used on the personal workstation for 6 weeks within the second half of the study after the wash-out period.

Treatment:

Device: Dynamic office chair (saddle chair with standard pendulum mechanism)

Study Track 1: Group B

Experimental group

Description:

A dynamic office chair (saddle chair with standard pendulum mechanism) will be used in the personal workplace for the first 6 weeks within the first half of the study. A wash-out period of a minimum of 4 weeks will be executed after the first half of the study. The pre-existing static office chair will be used on the personal workstation for 6 weeks within the second half of the study after the wash-out period.

Treatment:

Device: Dynamic office chair (saddle chair with standard pendulum mechanism)

Study Track 2: Group C

Experimental group

Description:

The pre-existing static office chair will be used in the personal workplace for the first 6 weeks within the first half of the study. A wash-out period of a minimum of 4 weeks will be executed after the first half of the study. A dynamic office chair (office swivel chair with integrated newly developed pendulum mechanism) will be used on the personal workstation for 6 weeks within the second half of the study after the wash-out period.

Treatment:

Device: Dynamic Office Chair (office swivel chair with integrated newly developed pendulum mechanism)

Study Track 2: Group D

Experimental group

Description:

A dynamic office chair (office swivel chair with integrated newly developed pendulum mechanism) will be used in the personal workplace for the first 6 weeks within the first half of the study. A wash-out period of a minimum of 4 weeks will be executed after the first half of the study. The pre-existing static office chair will be used on the personal workstation for 6 weeks within the second half of the study after the wash-out period.

Treatment:

Device: Dynamic Office Chair (office swivel chair with integrated newly developed pendulum mechanism)