ESA Document - Emits - ESA

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Figure 2-8: Allowable career Radiation Levels based on gender and age of the crew
2.2.4.6 Effect of microgravity
HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 28 of 422
Physiological systems have to adapt to the Martian gravity environment after the long exposure
to microgravity, and the reconditioning time varies for the different systems. The re-adaptation
of these systems is shown in Figure 2-9, in which a tentative limit has been established to
determine if some light physical work (walking on the surface of Mars for example) could be
performed without risk. This limit has been set after extrapolation from today’s knowledge about
the return to a 1-g environment. It can be seen in the graph that, with this extrapolation, the
physical limitation would be present during the first 7 days after return to the gravity
environment of Mars.
index of deconditioning
9
8
7
6
5
4
3
2
1
0
Reconditioning after spaceflight (6 month duration) with normal rehabilitation techniques on Earth
(1g)
physical condition at
which light physical
work could be
performed without
risk
1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132333435
days postlanding
neuro vestibular
cardio
fluids
red blood cell mass
lean body mass
bone
muscle
Figure 2-9: Assumed reconditioning time to Martian gravity environment