Review of Human Thermoregulation Models, Validation Methods, and Selected Responses to Gravity Dose Analogs



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2023 International Conference on Environmental Systems


As crewed spaceflight exploration expands through the Lunar Artemis program and future Mars missions, it is essential to develop an understanding of how varying gravity dose impacts human physiology to support both life support system design and crew health and performance. Since modeling is becoming increasingly important for physiological simulation and life support system design, including for the design of Extravehicular Activity (EVA) Liquid Cooling and Ventilation Garments (LCVGs), it is equally important to ensure that the computational models in development are validated with empirical data. Human computational thermal models, although in use since the 1960s, are primarily based on 1g data and have been validated through experimental and comparative analytical studies. On Earth, there are multiple gravity analogs that are used to measure physiological changes in humans based on gravity dose, including tilt tables, lower body negative pressure, and short and long arm centrifugation, along with bed rest studies. In this paper, a systematic review of published literature on methods and analog experiments used to validate human computational thermal models is presented. Also presented is published research conducted to generate germane physiological data related to gravity dose, focusing on thermoregulation and heat rejection. In summary, this review assembles a body of known thermoregulation computational model validation methods and published empirical data on physiological changes due to gravity dose, which could be used in combination to validate future human computational thermal models in variable gravity environments.


Maddie Haas, Texas A&M University, USA
Bonnie Dunbar, Texas A&M University, USA


Human physiology gravity dose, Human thermoregulation model validation, Human space exploration thermal models