Short answer

Designers should consider integrating subtle, automated movement mechanisms into furniture intended for prolonged use to encourage healthier postures and muscle engagement.

Field: Human Factors
Source: PLoS ONE (2023)
Method: Crossover trial
Sample: 20 participants
Evidence: Strong effect

A novel motorized office chair can induce frequent, low-amplitude spinal movements and increase trunk muscle activations during prolonged sitting, potentially mitigating the negative effects of sedentary behavior. This human factors research insight is drawn from a 2023 study published in PLoS ONE. Using Crossover trial with 20 participants, researchers explored how this design variable affects real-world outcomes. The key design takeaway: Designers should consider integrating subtle, automated movement mechanisms into furniture intended for prolonged use to encourage healthier postures and muscle engagement.

Study

Human FactorsRecentStrong effect

Motorized office chair promotes subtle spinal movement and trunk muscle engagement

PLoS ONE · 2023

Key Findings

01The motorized chair with CPM induced frequent low-amplitude changes in lumbar lordosis angle (498 ± 133 movements vs. 45 ± 38 static).
02A higher number of trunk muscle activations were observed in the CPM condition.
03Attentional control was not significantly altered by the CPM condition.
04Oxygen uptake did not increase significantly above baseline levels (less than 1.5 MET).

Application

Design takeaway

Designers should consider integrating subtle, automated movement mechanisms into furniture intended for prolonged use to encourage healthier postures and muscle engagement.

How to apply

When designing workstations or seating for prolonged sitting, explore mechanisms that can introduce gentle, varied movements to the user's posture.

Project actions

01Consider how your design can encourage subtle, beneficial movements for the user.
02Think about the physiological impacts of prolonged static postures and how design can counteract them.

Method & Evidence

AimTo investigate the effect of continuous passive motion (CPM) from a novel motorized office chair on lumbar lordosis, trunk muscle activation, oxygen uptake, and attentional control in office workers.

MethodCrossover trial

ProcedureParticipants completed a one-hour sitting session on a motorized office chair, with half experiencing continuous passive motion (CPM) and the other half sitting statically. The conditions were then switched for the second session. Measurements included lumbar sagittal movements and posture, trunk muscle activations via surface EMG, attentional control via the AX-CPT test, and oxygen uptake via spirometry.

Sample20 participants

ContextOffice work environment

Variables

IVContinuous passive motion (CPM) from the motorized chair (present vs. absent).

DVLumbar sagittal movements and posture, trunk muscle activations, attentional control, and oxygen uptake.

CVDuration of sitting (1 hour), type of chair (motorized office chair), participant demographics (office workers).

Strengths & Limitations

Strengths

+Crossover design reduces inter-individual variability.
+Objective measurements of spinal movement and muscle activation were used.

Limitations

The study focused on a specific type of motorized chair; results may vary with different designs. The attentional control and energy expenditure findings were not significant.

Reliability & validity

The use of objective measurement tools like EMG and the Epionics SPINE system enhances the reliability and validity of the findings regarding spinal movement and muscle activation. The crossover design also contributes to internal validity.

Think critically

To what extent can passive motion replace the benefits of active dynamic sitting, and what are the potential drawbacks of relying on automated furniture movements?

Design Principles

"Incorporate passive dynamic movement into static furniture to promote physiological engagement and mitigate sedentary risks."

This research offers a tangible solution for designers aiming to improve the well-being of individuals in sedentary roles. By incorporating dynamic elements into furniture, designers can proactively address health concerns associated with prolonged sitting, moving beyond static designs to create more supportive and health-conscious environments.

What This Means for Your Design

A special office chair that moves a little on its own can make your back move more and use your core muscles, which is better than sitting still all day.

How to use in your project

1.Reference this study when discussing the benefits of dynamic sitting or the design of ergonomic furniture.
2.Use the findings to justify the inclusion of movement-based features in your own design project.

Add to My Project

Quick Cite

Paragraph starter

Research indicates that incorporating passive dynamic motion into furniture, such as through a motorized office chair, can lead to increased spinal movement and trunk muscle activation during prolonged sitting. This suggests that design interventions aimed at mitigating the risks of sedentary behavior can be effective even with subtle, automated adjustments to posture.

Source

PLoS ONE

A novel motorized office chair causes low-amplitude spinal movements and activates trunk muscles: A cross-over trial

journal · 2023

View source

Questions About This Research

What does the research say about motorized office chair promotes subtle spinal movement and trunk muscle engagement?: Designers should consider integrating subtle, automated movement mechanisms into furniture intended for prolonged use to encourage healthier postures and muscle engagement. Evidence: PLoS ONE (2023).
Why does "Motorized office chair promotes subtle spinal movement and trunk muscle engagement" matter for design?: This research offers a tangible solution for designers aiming to improve the well-being of individuals in sedentary roles. By incorporating dynamic elements into furniture, designers can proactively address health concerns associated with prolonged sitting, moving beyond static designs to create more supportive and health-conscious environments.
How can designers apply this research?: Designers should consider integrating subtle, automated movement mechanisms into furniture intended for prolonged use to encourage healthier postures and muscle engagement.
What were the main findings?: The motorized chair with CPM induced frequent low-amplitude changes in lumbar lordosis angle (498 ± 133 movements vs. 45 ± 38 static).. A higher number of trunk muscle activations were observed in the CPM condition.. Attentional control was not significantly altered by the CPM condition.. Oxygen uptake did not increase significantly above baseline levels (less than 1.5 MET).
What research method was used?: Crossover trial with 20 participants.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2023 journal from PLoS ONE.
What should I do differently in my next project?: When designing workstations or seating for prolonged sitting, explore mechanisms that can introduce gentle, varied movements to the user's posture.
What are the limitations?: The study did not demonstrate significant improvements in attentional control or substantial increases in energy expenditure, and the long-term benefits of this type of dynamic sitting require further investigation.