5. Conclusions
Spatial summation in the perception of 160 Hz vibration was
found at the big toe, the ball of the foot, and the thenar eminence
with 3 mm, 6 mm, and 10 mm diameter probes, and at the fingertip
with 1 mm, 3 mm, 6 mm and 10 mm diameter probes, indicating
that perception of this frequency of vibration was mediated by the
Pacinian channel. No spatial summation was observed at the big
toe, the ball of the foot, or thenar eminence when using a 1 mm
probe, consistent with 160 Hz thresholds being mediated by the
NP II channel with this small probe. Thresholds for the perception
of 160 Hz vibration at the heel may also be mediated by the Pacinian
channel. There was no evidence of spatial summation in the perception
of 20 Hz vibration at the big toe, the ball of the foot, the heel, the
thenar eminence, or the fingertip, consistent with the perception
of this frequency being mediated by the NP I channel.
Thresholds for the perception of 160 Hz vibration are lowest at
the fingertip and greatest at the big toe. Thresholds for the perception
of 20 Hz vibration are lowest at the fingertip but similar at the
thenar eminence and the sole of the foot.
When obtaining thresholds at the foot, the characteristics of the
vibrating probe, including the probe diameter and the gap to a stationary
surround, should be controlled and defined. There is a need
for standardisation of methods of measuring vibrotactile thresholds
at the sole of the foot for diagnostic applications.
5. ConclusionsSpatial summation in the perception of 160 Hz vibration wasfound at the big toe, the ball of the foot, and the thenar eminencewith 3 mm, 6 mm, and 10 mm diameter probes, and at the fingertipwith 1 mm, 3 mm, 6 mm and 10 mm diameter probes, indicatingthat perception of this frequency of vibration was mediated by thePacinian channel. No spatial summation was observed at the bigtoe, the ball of the foot, or thenar eminence when using a 1 mmprobe, consistent with 160 Hz thresholds being mediated by theNP II channel with this small probe. Thresholds for the perceptionof 160 Hz vibration at the heel may also be mediated by the Pacinianchannel. There was no evidence of spatial summation in the perceptionof 20 Hz vibration at the big toe, the ball of the foot, the heel, thethenar eminence, or the fingertip, consistent with the perceptionof this frequency being mediated by the NP I channel.Thresholds for the perception of 160 Hz vibration are lowest atthe fingertip and greatest at the big toe. Thresholds for the perceptionof 20 Hz vibration are lowest at the fingertip but similar at thethenar eminence and the sole of the foot.When obtaining thresholds at the foot, the characteristics of thevibrating probe, including the probe diameter and the gap to a stationarysurround, should be controlled and defined. There is a needfor standardisation of methods of measuring vibrotactile thresholdsที่พื้นเท้าสำหรับการวินิจฉัย
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