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Thermal Plantar Analysis

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After the results of a western blot for each rat is gathered and it is confirmed that the rats are expressing the HaloX gene, then ten rats are chosen for the initial round of pain testing procedures. Several days before the rats begin pain testing, the rats are given times to acclimate to the testing procedure and animal enclosure, which is an elevated cage with mesh flooring. allowing for the exposure the rats’ paws. Once the rats are acclimated, the testing environment will be controlled for temperature, noise levels, and time of day to control for any other possible stressors that could possibly affect the rats’ tolerance for pain. Once those conditions are set, the baseline thresholds for the rats are determined. For eight days, the …show more content…

This instrument would be calibrated to have an intensity range that varied the heat intensity, and the highest setting is calibrated to not be too hot to burn the rat. Like the mechanical pain threshold testing, the rats will enter their assigned cages at a 1 PM and are allowed 15 minutes to get acclimated in the cage. Once the rats are acclimated and stationary, the instrument is positioned below the surface of the left hind paw, so that the heat can radiate through the bottom of the cage. The instrument will record the amount of time between the start of the machine to the time the rat withdrawals their paw. If an ambiguous response occurs, then allow the rat 5 minutes to reacclimate and repeat the pain testing. Licking or shaking the hind paw after stimulation is a type of behavior associate with pain. Repeat the heat stimulation at least 3 more times for each rat and record the times, and then the mean for paw withdraw latencies are calculated. Each of the ten rats experienced this procedure for four days, and the rats were given two resting days from testing. The following ten days examined how optogenetics intervention could dull pain

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