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The relationship between dietary intake, exercise, energy balance and the space craft environmentSpace flight is associated with the loss of skeletal muscle, principally from muscles with anti-gravity functions. Examination of data across different missions can permit a distinction to be made between true microgravity responses and what are mission-specific responses. Protein metabolism has been investigated on six missions, four short-term [Shuttle missions Space Life Sciences 1 (1991, SLSI), Space Life Sciences 2 (1993, SLS2), Deutsche-2 (1993, D2) and the Life and Microgravity Sciences (1996, LMS)] and two long-term missions (Skylab 1993 and NASA/MIR, 1996-1998). Measurements made include dietary intake (six missions), nitrogen balance (four missions), whole-body protein kinetics with [15N]glycine as the tracer (four missions) and cortisol excretion (three missions). Also available for comparison are bed rest studies with and without exercise. The purpose of this paper is to see what can be learnt about the muscle loss problem by comparing metabolic results across the six missions for which data are available and against bed rest. The analysis suggests that there is a linkage between the inability to maintain energy balance and exercise, and the connection is the decreased efficiency of removal of the metabolic by-products of exercise (heat, CO2) during space flight.
Document ID
20040112561
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stein, T. P.
(University of Medicine and Dentistry of New Jersey-SOM Stratford 08084, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2000
Publication Information
Publication: Pflugers Archiv : European journal of physiology
Volume: 441
Issue: 2-3 Suppl
ISSN: 0031-6768
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
long duration
STS Shuttle Project
short duration
manned
Mir Project
Non-NASA Center
Flight Experiment
Skylab Project
NASA Discipline Regulatory Physiology

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