Task-Agnostic Exoskeleton Control Supports Elderly Joint Energetics during Hip-Intensive Tasks
🤖 AI Summary
This study addresses the increased energetic burden on older adults during daily activities, resulting from age-related ankle joint dysfunction that shifts reliance to the hip joint—a strategy compromised by the concurrent decline in maximal hip power with aging. To mitigate this, the work proposes a task-agnostic adaptive controller for a hip exoskeleton that delivers precise assistance across diverse activities without requiring predefined task identification. The approach leverages real-time joint power sensing and biomechanical power synchronization, dynamically modulating assistive torque through multi-task kinematic analysis. Experimental results demonstrate that, across tasks including level walking, incline walking, stair ascent, and sit-to-stand transitions, the system reduces positive biological hip work by 24.7% and total lower-limb biological work by 9.3%, while enhancing overall hip output power and significantly lowering peak biological power demand.
Application Category
📝 Abstract
Age-related mobility decline is frequently accompanied by a redistribution of joint kinetics, where older adults compensate for reduced ankle function by increasing demand on the hip. Paradoxically, this compensatory shift typically coincides with age-related reductions in maximal hip power. Although robotic exoskeletons can provide immediate energetic benefits, conventional control strategies have limited previous studies in this population to specific tasks such as steady-state walking, which do not fully reflect mobility demands in the home and community. Here, we implement a task-agnostic hip exoskeleton controller that is inherently sensitive to joint power and validate its efficacy in eight older adults. Across a battery of hip-intensive activities that included level walking, ramp ascent, stair climbing, and sit-to-stand transitions, the exoskeleton matched biological power profiles with high accuracy (mean cosine similarity 0.89). Assistance significantly reduced sagittal plane biological positive work by 24.7% at the hip and by 9.3% for the lower limb, while simultaneously augmenting peak total (biological + exoskeleton) hip power and reducing peak biological hip power. These results suggest that hip exoskeletons can potentially enhance endurance through biological work reduction, and increase functional reserve through total power augmentation, serving as a promising biomechanical intervention to support older adults' mobility.
Problem
Research questions and friction points this paper is trying to address.
age-related mobility decline
hip-intensive tasks
joint kinetics redistribution
elderly mobility support
task-agnostic control
Innovation
Methods, ideas, or system contributions that make the work stand out.
task-agnostic control
hip exoskeleton
joint power assistance
elderly mobility
biomechanical intervention
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