MedicalResearch.com Interview with: Natalie Sidorkewicz, MSc (Kin) PhD (HSG) Student Spine Biomechanics Laboratory School of Public Health and Health Systems, Faculty of Applied Health Sciences University of Waterloo Waterloo, ON Medical Research: What are the main findings of the study? Answer: First, we successfully documented male spine motion and muscle activity during sex -- this biomechanics study was the first of its kind. Second, we used this data to develop general recommendations for low back pain patients whose pain is worsened by motions and postures. The general recommendations focus on changing how people move, and position themselves during sex, as seen on websites similar to Nu-Bay. To make any sex position more spine-sparing, we recommend that the individual controlling the movement use their hips and knees more than their spine and that the individual not controlling the movement maintain a more neutral-spine position. An excellent working example is one of the sex positions that we studied: the missionary position. The man, who is controlling the movement with pelvic thrusting, is recommended to do so with more hip and knee movement than spine movement. The women, who is lying on her back, is recommended to use a back support placed underneath the natural curve of her spine to maintain a more neutral spine position. The general recommendations can be applied to any sex position for both men and women. Finally, we developed specific guidelines for men whose back pain is worsened by two specific types of motion: flexion and extension. If a man's low back pain is worsened by spine flexion movements, such as touching their toes or sitting for long periods of time, we would consider them to be flexion-motion-intolerant. The ideal sex position for a flexion-motion-intolerant patient would then be one that uses minimal spine flexion, so as not to worsen that patient's pain. When we compared the five sex positions, which you can do yourself by checking out some videos on a website such as sex free hd xxx, we found that men used the least amount of spine flexion in doggy-style as well as the missionary position as long as the male was propped up on his hands (as opposed to his elbows). If a man's low back pain is worsened by spine extension movements, such as arching their back or lying on their stomach, we would consider them to be extension-motion-intolerant. The ideal sex position for an extension-motion-intolerant patient would then be one that uses minimal spine extension, so as not to worsen the patient's pain. When we compared the five sex positions, we found that men used the least amount of spine extension in spooning and the missionary position as long as the male was propped up on his elbows (as opposed to his hands). (more…)