Final answer:
Pressure perineometry is an invasive method to measure the strength of pelvic floor muscles using a pressure-sensitive device, whereas SEMG is a non-invasive technique that records electrical activity of muscles to assess their function. Mercury manometers are used instead of water manometers for blood pressure measurements due to mercury's higher density, allowing for more practical and readable measurements.
Step-by-step explanation:
Pressure perineometry and surface electromyography (SEMG) are two methods used to assess and monitor pelvic floor muscle function. Pressure perineometry involves the use of a pressure-sensitive device inserted into the vagina or rectum to measure the strength and endurance of the pelvic floor muscles, which is vital in the evaluation and treatment of pelvic floor disorders. It offers a direct measure of pressure within these cavities to check the effectiveness of muscle contractions.
On the other hand, surface electromyography (SEMG) is a non-invasive technique that measures the electrical activity of the muscles through sensors placed on the skin. This electrical activity correlates with the muscular contraction strength, providing clinicians with quantitative data on muscle function during rest and activity.
Typical arterial blood pressures are relatively high, which is why mercury manometers are used rather than water manometers. Mercury has a higher density than water, hence a smaller column of mercury is needed to balance the blood pressure, making the measurements more practical and easier to read.