The relationship between dietary intake, exercise, energy balance and the space craft environment.
Pflugers Arch
; 441(2-3 Suppl): R21-31, 2000.
Article
en En
| MEDLINE
| ID: mdl-11200976
ABSTRACT
Space 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.
Palabras clave
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Vuelo Espacial
/
Regulación de la Temperatura Corporal
/
Ejercicio Físico
/
Ingestión de Alimentos
/
Metabolismo Energético
Límite:
Humans
Idioma:
En
Revista:
Pflugers Arch
Año:
2000
Tipo del documento:
Article
País de afiliación:
Estados Unidos