The primary goal of the Nutritional Biochemistry Laboratory
is to determine the nutritional requirements for extended-duration
spaceflight. Integral to that are the goals to maintain
astronaut health and to develop, evaluate, and validate
nutritional countermeasures to prevent or minimize the
negative effects of long-duration spaceflight on the human.
The Nutritional Biochemistry Laboratory activities are
split between operations and research. The primary operational
activity is the support of the Clinical Nutritional Assessment
profile, which is completed before and after International
Space Station flights.
Dietary intake and body mass are monitored during these
long-duration (4 to 6-month) missions. In addition to
general dietary intake issues, several specific nutrients
are also of concern. Vitamin D levels decline during flight,
most likely related to the lack of ultraviolet light exposure.
This is very important for bone and calcium metabolism,
as well as other body systems. Folate, another vitamin,
also appears to decline during flight, which may be related
to the content of the food, the stability of the food
on orbit (related to both time and radiation exposure),
or changes in the body's need for folate.
Nutritional Biochemistry Laboratory research efforts
have included spaceflight and ground-analog studies
with human subjects. One current flight experiment is
extending the operational Clinical Nutritional Assessment
profile by including inflight blood and urine collections
on ISS. Other projects include the investigation of
effects of exercise or nutritional countermeasures on
bone metabolism during bed rest. The Clinical Nutritional
Assessment profile is part of the routine testing being
performed in ongoing bed rest studies. The Nutritional
Biochemistry Laboratory recently completed a vitamin
D supplementation study at McMurdo Station, Antarctica,
and studies of oxidative damage during saturation dives
off the coast of Key Largo, Florida. The Nutritional
Biochemistry Laboratory has numerous ongoing collaborative
projects with universities across the U.S. and around
the world, and has included a National Institutes of
Health (NIH) funded project to determine how nutritional
status is related to elderly self-neglect.
Nutrition was critical for early explorers on Earth
and will be even more important for astronaut explorers.
The benefits of using nutrition and dietary patterns
as countermeasures to prevent negative conditions associated
with spaceflight include the low risks for side effects,
low costs, and minimal crew time required during flight.
Research in other areas (for example, cardiovascular,
muscle, bone, immunology, and radiation) has highlighted
nutrition as integral to their success and indicated
where additional efforts are required. These efforts
will enable safe human exploration of space.
|