 This study will utilize a crossover design to study autonomic nervous system responses in healthy subjects. Prior to commencing data collection, Institutional Review Board approval has been obtained from the Mount St. Marys College Committee for the Protection of Human Subjects. Once obtained subjects will be recruited from faculty, students, and staff of the College. A snowball methodology will be used to recruit friends, family, and acquaintances of these initial connections. To be included in this study, candidates must be between the age of 18 and 55 years of age. They must not have pain in any area of their body that is chronic in nature has been present for greater then three months. Subjects who are pregnant or have a history of spinal surgery will be excluded from participation in this study. All subjects who fulfill the inclusion and exclusion criteria will be informed of the intent, methods and risks associated with the study and given an opportunity to ask questions. Following this information session, and if agreeing to participate in the study, subjects will be asked to fill out the attached informed consent form. All subjects will be notified and given the opportunity to withdrawal from the study at any time without repercussions. 