Joel I. Leonard

• A systems analysis of the erythropoietic responses to weightlessness
• An integrated analysis of the physiological effects of space flight
• Analysis of head-down tilt as an analog of weightlessness using a mathematical simulation model
• Description, validation, and modification of the Guyton model for space-flight applications
• Energy balance and the composition of weight loss during prolonged space flight
• Fluid-electrolyte responses during prolonged space flight
• Predictions of cardiovascular responses during STS reentry using mathematical models
• The behavior of renal-regulating hormones during hypogravic stress
• The modeling and simulation of feedback control systems
• Water immersion and its computer simulation as analogs of weightlessness