Study
Human FactorsNew This WeekStrong effect

Active soft exoskeletons reduce lumbar muscle strain by up to 40% during lifting tasks

Active soft exoskeletons significantly decrease muscular activity in the back extensors during symmetric lifting tasks compared to passive exoskeletons or no support.

Scientific Reports · 2025

01

Key Findings

  • 01The active soft exosuit significantly reduced mean and peak EMG levels in back extensors.
  • 02The passive rigid exosuit showed modest reductions in EMG, particularly during unloaded tasks.
  • 03Peak muscle activity occurred within 30-40% of the motion cycle.
  • 04The passive exoskeleton introduced delays in bending motion due to its resistance.
02

Application

Design takeaway

Prioritize active assistance mechanisms in wearable support systems designed for high-load lifting tasks to maximize muscle strain reduction and worker well-being.

How to apply

When designing or specifying wearable assistive devices for manual labor, consider the benefits of active systems for reducing muscle fatigue and injury risk, especially in tasks involving significant lifting or bending.

Project actions

  • 01When researching assistive devices, clearly define the type of support (active vs. passive) and its intended task.
  • 02Consider measuring both physiological responses (like muscle activity) and user perception (like comfort and workload).
03

Method & Evidence

AimTo compare the effects of an active soft back exoskeleton versus a passive rigid exoskeleton on muscular activity and perceived usability during symmetric lifting tasks.
MethodExperimental study with physiological and subjective measurements.
ProcedureParticipants performed bending and lifting tasks under three conditions: no exosuit, with an active soft exosuit, and with a passive rigid exosuit. Electromyographic (EMG) signals from back extensors were recorded, and subjective workload was assessed using the NASA-TLX questionnaire.
Sample15 participants
ContextOccupational safety and ergonomics in physically demanding work environments, such as construction.

Variables

IV["Type of back exoskeleton (None, Active Soft, Passive Rigid)"]
DV["Mean EMG levels of back extensors","Peak EMG levels of back extensors","Subjective workload (NASA-TLX scores)"]
CV["Symmetric lifting task","Participant health status (healthy)","Weight of lifted object (implied, as tasks were loaded/unloaded)"]
04

Strengths & Limitations

Strengths

  • +Direct measurement of muscle activity (EMG) provides objective data.
  • +Inclusion of subjective workload assessment offers a user-centered perspective.

Limitations

The study used a small sample of healthy individuals, so results might not apply to workers with pre-existing back conditions or those performing highly varied tasks.

Reliability & validity

The use of EMG provides objective and quantifiable data, enhancing reliability. The inclusion of subjective measures like NASA-TLX adds a layer of validity by capturing user experience. However, the limited sample size and controlled lab environment might affect generalizability.

Think critically

How might the long-term use of active exoskeletons affect the natural strength and adaptability of the human musculoskeletal system?

05

Design Principles

"Active support systems can provide greater physiological load reduction than passive systems for dynamic, high-force tasks."

This research provides critical data for designers developing wearable support systems. Understanding the differential impact of active versus passive technologies on physiological load can inform design choices aimed at enhancing worker safety and reducing the incidence of low back injuries in physically demanding professions.

06

What This Means for Your Design

Wearing a smart, active back brace helps your back muscles work less hard when you lift heavy things, much more than a regular stiff brace.

How to use in your project

  • 1.Reference this study when discussing the biomechanical benefits of assistive technologies or when justifying the choice of active over passive support in your design project.
07

Add to My Project

08

Quick Cite

(2025). Effects on muscular activity and usability of soft active versus rigid passive back exoskeleton during symmetric lifting tasks. Scientific Reports. https://doi.org/10.1038/s41598-025-14500-3 Retrieved from https://designdex.org/study/00c7c207-6e0c-49d9-9d62-acdad9ed97b6/active-soft-exoskeletons-reduce-lumbar-muscle-strain-by-up-to-40-during-lifting-tasks

Paragraph starter

Research indicates that active soft exoskeletons can significantly reduce muscular strain during lifting tasks, offering greater benefits than passive designs by actively assisting movement and reducing peak muscle activity. This suggests that for applications requiring substantial physical support, active systems are a more effective choice for mitigating user fatigue and injury risk.

09

Source

Scientific Reports

Effects on muscular activity and usability of soft active versus rigid passive back exoskeleton during symmetric lifting tasks

journal · 2025

View source

Questions about this research

What does the research say about active soft exoskeletons reduce lumbar muscle strain by up to 40% during lifting tasks?
Prioritize active assistance mechanisms in wearable support systems designed for high-load lifting tasks to maximize muscle strain reduction and worker well-being. Evidence: Scientific Reports (2025).
Why does "Active soft exoskeletons reduce lumbar muscle strain by up to 40% during lifting tasks" matter for design?
This research provides critical data for designers developing wearable support systems. Understanding the differential impact of active versus passive technologies on physiological load can inform design choices aimed at enhancing worker safety and reducing the incidence of low back injuries in physically demanding professions.
How can designers apply this research?
Prioritize active assistance mechanisms in wearable support systems designed for high-load lifting tasks to maximize muscle strain reduction and worker well-being.
What were the main findings?
The active soft exosuit significantly reduced mean and peak EMG levels in back extensors.. The passive rigid exosuit showed modest reductions in EMG, particularly during unloaded tasks.. Peak muscle activity occurred within 30-40% of the motion cycle.. The passive exoskeleton introduced delays in bending motion due to its resistance.
What research method was used?
Experimental study with physiological and subjective measurements. with 15 participants.
How strong is the evidence?
Evidence strength is rated Strong effect, based on a 2025 journal from Scientific Reports.
What should I do differently in my next project?
When designing or specifying wearable assistive devices for manual labor, consider the benefits of active systems for reducing muscle fatigue and injury risk, especially in tasks involving significant lifting or bending.
What are the limitations?
Study conducted with healthy participants; real-world effectiveness may vary with different user populations and task complexities. Long-term effects and comfort were not extensively evaluated.
Is there evidence that muscle strain affects design outcomes?
Active soft exoskeletons offer superior reduction in back muscle strain during lifting compared to passive ones, though both provide some benefit. This research provides critical data for designers developing wearable support systems. Understanding the differential impact of active versus passive technologies on physio Source: Scientific Reports (2025).
Where does this lifting tasks research apply?
Occupational safety and ergonomics in physically demanding work environments, such as construction. It sits within human factors research on designdex.org.

Related research topics

muscle strain design research · evidence on muscle strain · does muscle strain improve design outcomes · lifting tasks studies for designers · muscle strain and lifting tasks findings · human factors research evidence