Table 1. Skin biochemical parameters.

	Ground	Space
Hydration (%)	58.4±3.4	58.5±2.9
	(μg per mg wet weight)
Total collagen	293±55	300±54
Newly synthesized procollagen soluble in 0.15 M NaCl	2.2±0.3	3.0±0.6*
1 M NaCl	2.3±0.3	3.4±0.7**
Collagen soluble in 0.5 M HAc	23.2±3.9	24.5±3.2

*P=0.05, **P=0.03, Student's t-test.