[Stresses] Acceleration and heat/cold [Test Animal] Man [Measures] G tolerance (peripheral light loss) [Effect] Heat lowers G tolerance. Cold raises G tolerance [Physiological Interaction] 
Additive, synergistic
A d d i t i v e
N o n e
A d d i t i v e , s y n e r g i s t i c
A d d i t i v e , a n t a g o n i s t i c
A n t a g o n i s t i c
V a r i a b l e