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Student: Tyler Humphrey Advisor: Dr. Michael Dancisak Automated Thermal Control Attenuating Device
Liquid Cooling/ Warming Garments Most are vests and suits designed to control core body temperature1 Have been used recently to delay muscle fatigue and decrease heat injury occurrences of individuals working in extreme environments CAMS developed sleeves or wraps used for particular body parts or muscle groups EMS treatment of nerve trauma patients2 Lowers core temperature prevents apoptosis of nerve cells Reduces cell death cascade in CNS
Pre-Cooling and Intermittent Cooling Precooling Decreasing an individual’s core body temperature below 37 degrees Celsius before intense activity3 Usually for a long period (30 min-1 hr) of active cooling followed by a short period (10-15 min)of inactive resting before intense activity3 Increases time before an individual experiences heat stress5 Intermittent Cooling Cooling in between periods of intense activity Offsets muscle fatigue3 Lowers the concentration of Lactic Acid and HCO3 in muscles4
LCWG Design Uses two separate temperature controlled water reservoirs and pumps Allows user to switch between two temperatures quickly Each area of the suit has its own inlet and outlet hose Allows each area to be chilled independently Controlled by a series of solenoid valves connected to a manifold CAMS Liquid Cooling Sleeve- Photo courtesy of New Wave Controlling Body Temperature May Fight Fatigue , Kathryn Hobgood 2009
Can be used for medical, labor, or athletic purposes
Future Direction of Project Temperature history on control panel Use of thermo-couple readings to develop a more accurate thermo-profile Allows adjustments to be made depending on an individual’s therm0-profile Digital Control of Chillers Use of both Chilling units at the same time Cooling one area while warming another Medical/Surgical applications
Acknowledgements I would like to thank Dr. Dancisak and James Barrios for the collective effort in the development of this project. I would also like to thank the Tulane department of Biomedical Engineering for all of the help and guidance over the years.
References 5. S. H. Constable, P. A. Bishop, S. A. Nunneley, and T. Chen, Intermittent Microclimate Cooling During Rest Increases Work Capacity and Reduces Heat Stress (Ergonomics, 1994), p. 227-285. Molecular Mechanisms Underlying Hypothermia-Induced Neuroprotection , Shintani, Yasushi / Terao, Yasuko / Ohta, Hiroyuki , Stroke Research and Treatment, 2011,Dec 2010 S. H. Bomalaski, Y. T. Chen, and S. H. Constable, Continuous and Intermittent Personal Microclimate Cooling Strategies (Aviation, Space, and Environmental Medicine, August 1195), p. 745-750 Nielsen, B., Savard, G., Richter, E. A., Hargreaves, M., & Saltin, B. (1990). Muscle Blood-Flow and Muscle Metabolism During Exercise and Heat-Stress. Journal of Applied Physiology, 69: 1040-1046. Effect of pre-cooling, with and without thigh cooling, on strain and endurance exercise performance in the heat,J.D. Cottera,, G.G. Sleivertb, W.S. Robertsa, M.A. Febbraio