ArticleBio-medical materials and engineering2018
An evaluation of the contact forces on the fingers when squeezing a spherical rehabilitation ball.
Article in Bio-medical materials and engineering, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- A Soft Exoskeleton for Hand Grip Augmentation and Fall Prevention Assistance in Tower Climbing.Biomimetics (Basel, Switzerland) · 2025Article
- Innovative Bionics Product Life-Cycle Management Methodology Framework with Built-In Reverse Biomimetics: From Inception to Clinical Validation.Biomimetics (Basel, Switzerland) · 2025Article
- Analysis of the Contact Area for Three Types of Upper Limb Strikes.Journal of functional morphology and kinesiology · 2022Article
- High-wearable EEG-based distraction detection in motor rehabilitation.Scientific reports · 2021Article
Corrections and comments
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Authors and funding
4 authors.
Funding
Abstract
The rehabilitation squeeze ball is a popular device to help strengthen the hand, fingers and forearm muscles. The distributions of the contact pressure in the interface between the therapy ball and hand/fingers can affect the joint moment of each of the individual fingers, thereby affecting rehabilitation effects. In the current study, we evaluated the contact force distributions on the fingers when gripping a spherical object. Eight female adults [age 29 (9.1) years, mass 64.6 (7.1) kg, height 163.5 (1.9) cm, hand length 17.2 (0.7) cm] participated in the study. Contact force sensors were attached to the middle of the palmar surfaces of the distal, middle, and proximal phalanges of the four fingers in the longitudinal direction. In order to evaluate the effects of the ball stiffness on the contact force distributions on the fingers, subjects were requested to perform quasi-static gripping on a standard tennis ball and on a rehabilitation ball. The tennis ball is much stiffer and experiences smaller deformation under compression compared to the rehabilitation ball. We analyzed the force share among the distal, middle, and proximal finger segments, when subjects gripping balls of different stiffnesses (tennis ball vs. rehabilitation ball) and at three different grip efforts. Our results indicated that the grip force is contributed about 60% and 40% by the middle/ring fingers and by the index/little fingers, respectively. These characteristics are independent of the grip force levels and stiffness of the contact surface.
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