Metabolic Heat Generation During Exercise ME 340 Final Project Ryan Huff & Scott Wood

Experimental Setup Goal: To determine the efficacy of dry release exercise shirts Procedure: –Used 24 AFROTC Cadet Volunteers –Measured body temperature from the armpit using a thermocouple before and after exercise –Performed a 2 3 factorial experiment –Three Factors: Exercise Length (5/10 min) Exercise Type (Run/Walk) Shirt Type (DryRel/Cotton)

Analytical Model Energy Balance: Assumptions –Model body as long cylinder –Conduction through the muscles to the skin –Convection and radiation from the skin to the environment –(ε = 1) Heat Source Shirt Control Surface Air, T ∞ TsTs TbTb

Experimental Results Interaction P-values Shirt Type*Ex Type 0.10 Shirt Type*Ex Length0.01 Ex Type*Ex Length0.08 Shirt Type*Ex Type*Ex Length 0.04 Shirt Type Ex Type Ex Length Shirt Type DryRelease Cotton

Conclusions Dry Release Shirt had an effect on body temperature during exercise Using a Dry Release shirt will better maintain core body temperature during activity Model only works for data collected and range specified Further study and modeling need to be performed

Recommendations Length of exercise –20 and 50 minutes –Should use heart rate monitors to ensure more uniform exercise intensity Measurement Accuracy –Use thermocouples with faster response –Measure body temperature from a different location…uh oh, where?

Dry Release (h)

Cotton (h)