Sonographic Measurement of Intraneural Blood Flow in the Median Nerve

Participants' dominant hand and wrist will be immersed in cool water (20°C) for five minutes. The cool water will be kept to around 20°C (19 - 21°C) by frequently checking the temperature and corrected when it rises to 20.5°C

A heat pack wrapped in a towel will be applied to participants' dominant hand for five minutes.

Participants will be asked to participate in moderate-intensity physical activities to induce an increase in blood pressure. The physical activity will be two sets of 30 jumping jacks, followed by 15 squats. Participants are allowed to rest for 20 seconds between the two sets.

All participants will be asked to perform a typing task with a standard wired keyboard. All subjects will be asked to type for five minutes.

"Participants will be asked to draw as many lower-case alphabet characters from a to z as possible using a standardized scroll mouse for five minutes in the Windows Microsoft Paint software."

Participants will be asked to participate in a cooking trial following a prespecified cooking recipe of Rice Krispy Treat. he participant will be asked to follow the procedures as follows: (1) cut and put wax paper in the pan; (2) cut butter into 4 pieces; (3) place butter in a pot over a portable stove and stir until the butter is completely melted; (4) add four oz of marshmallows and stir until melted; (5) add cereal and the rest of marshmallows and stir until all ingredients are combined (6) transfer the ingredients to the pan and use a silicone spatula to pat the ingredients evenly into pan.