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Plantar temperature and vibration perception in patients with diabetes: A cross-sectional study

Ashok Bhargavi Haripriya, Karnam Anantha Sunitha, Janarthan Kumar

Biocybernetics and Biomedical Engineering

2020

Vol. 40, no. 4

1600--1610

Diabetes mellitus has many microvascular and macrovascular complications. Diabetic foot is a major consequence of these complications. Foot ulcers are the leading cause of non-traumatic amputations and early diagnosis can prevent amputation. In this study, thermal foot images and biothesiometer values of 50 control subjects and 50 known diabetic subjects were analyzed. The thermal images were analyzed using a graphical interface-enabled program developed indigenously to identify possible hotspots (abnormal temperature variation). Data comparison was conducted based on the concept of asymmetry. Temperature and vibration perception values obtained at the same points on the left and the right feet were compared. The use of a combination of thermal images and vibration perception resulted in lower incidence of false positive results in the pre-evaluation of possible plantar lesions. Pearson's correlation test was performed to analyze the statistical significance of these factors. This study concluded that the classification of factors leading to pre-ulcerative lesions in the diabetic foot could be accomplished with a higher level of confidence by using multiparameter data rather than a single-variable predictive model.

Vibrotactile amplitude discrimination on the wrist of visually impaired people

Czopek Dorota, Wiciak Jerzy

Vibrations in Physical Systems

2019

Vol. 30, nr 1

art. no. 2019107

Support for spatial orientation and mobility of the blind and partially sighted people is still a hot and unsolved topic. It is well known that in supporting devices non-acoustic communication is recommended due to the role of the sense of hearing in the spatial orientation of the visually impaired people. Knowledge about discriminative ability of touch is crucial when designing devices which use tactile interfaces. The paper presents results of psychophysical studies connected with vibration perception on the wrist of blind and partially sighted people. The presented research examined the ability to identify the changes of amplitude of vibration on the wrist. Research was carried out on students of Special Schools for the Blind and Partially Sighted Children in Krakow. Thirty blind, partially and normal sighted people were examined. Transformed up/down method was used to determine vibrotactile amplitude discrimination threshold. Thresholds were obtained on the ventral wrist at 5 frequencies: 25, 32, 63, 125 and 250 Hz. Results were examined to find factors which could influence the threshold value.