The Vaginal photoplethysmograph (VPG) is a controversial type of plethysmograph. It consists of a clear acrylic, rod-shaped device that contains a light source, and a light detector. The light source illuminates the capillary bed of the vaginal wall and the blood circulating within it. The amount of light that is backscattered is thought to be directly related to the transparency of engorged and unengorged tissue and, hence, serves as an indirect measure of vasoengorgement, an indication of sexual arousal. However, there are many problems with the instrument including (1) lack of validation of its direct relationship with vasocongestion, (2) lack of an absolute scale precluding between-participant comparisons in research, and (3) its perceived invasiveness by some research participants. A plethysmograph is an instrument for measuring changes in volume within an organ or whole body (usually resulting from fluctuations in the amount of blood or air it contains). ... Structure of methyl methacrylate, the monomer that makes up PMMA Polymethyl methacrylate (PMMA) or poly(methyl 2-methylpropenoate) is the synthetic polymer of methyl methacrylate. ... This article or section does not cite its references or sources. ... Backscatter is the reflection of waves, particles, or signals back to the direction they came from. ... This article or section does not cite any references or sources. ...
The device was first introduced in 1967 by Palti and Berovici and refined in 1975 by Sintchak and Geer. It was the first practical and reliable device for the measurement of vaginal blood flow. The vaginal probe was designed to be easily inserted by the subject. Its introduction spurred great (research) interest in the area of female sexual arousal throughout the late 70s and early 80s. Research in this area has increased significantly recently, particularly since the introduction of Viagra for men. 1967 (MCMLXVII) was a common year starting on Sunday of the Gregorian calendar (the link is to a full 1967 calendar). ... Year 1975 (MCMLXXV) was a common year starting on Wednesday (link will display full calendar) of the Gregorian calendar. ...
Use
The device remains the most frequently used method for monitoring vaginal blood flow.
The penile plethysmograph (PPG) is a controversial type of plethysmograph that measures changes in blood flow in the penis in response to audio and/or visual stimuli. ... A plethysmograph is an instrument for measuring changes in volume within an organ or whole body (usually resulting from fluctuations in the amount of blood or air it contains). ...
The light source illuminates the capillary bed of the vaginal wall and the blood circulating within it.
The amount of light that is backscattered is in direct relation to the transparency of engorged and unengorged tissue and, hence, serves as an indirect measure of vasoengorgement, an indication of sexual arousal.
It was the first practical and reliable device for the measurement of vaginal blood flow.
Feeds |
Contact