Effect of exercise, standing, negative trunk and positive skeletal pressure on bed rest-induced orthostasis and hypercalciuria /
N.C. Birkhead [and three others].

Description

Main Author

Birkhead, N. C.

Related Names

Aerospace Medical Research Laboratories (U.S.)
Human Factors and Ergonomics Collection.
Lankenau Hospital

Language(s)

English

Published

Wright-Patterson Air Force Base, Ohio : Aerospace Medical Research Laboratories, Aerospace Medical Division, Air Force Systems Command, 1966.

Subjects

Hypercalciurea.
Bed rest.
Hypercalciurea.
Bed rest.
Technical reports.
Tables (Data)
Tables (Data)
Technical reports.

Summary

"Tilt intolerance and hypercalciuria were induced in healthy subjects (fed weighed diets) by 18-32 days continuous bed rest in a Metabolic Ward. The effect of supplementing bed rest with daily supine bicycle exercise (2 or 4 hours), quiet standing (3 hours), or longitudinal supine skeletal pressure on orthostasis and urinary calcium was determined. Tilt tolerance was evaluated by blood pressure and heart rate response to 10 minutes of 70° head-up body tilt and urinary calcium excretion by analysis of 3- or 6-day urine collections. Supine bicycle exercise was ineffective in significantly reducing tilt intolerance or hypercalciuria. Standing decreased orthostasis in 3 of 5 subjects and decreased urinary calcium in 4 of 5 subjects. Longitudinal skeletal pressure decreased hypercalciuria in 1 of 2 subjects but did not improve tilt tolerance. Intermittent lower body negative pressure during bed rest in one subject impeded development of orthostasis but increased urine calcium. Three hours daily standing is the minimum effective duration for reversing bed rest-induced tilt intolerance and hypercalciuria while supine bicycle exercise is not a practical method for obtaining similar effects."--Abstract.

Note

"The research was conducted by the Division of Research of the Lankenau Hospital, Philadelphia, Pennsylvania 19151, under Contract No. AF 33(615)-1538. The work was performed in support of Project No. 7164, "Biomedical Criteria for Aerospace Flight," and Task No. 716405, "Aerospace Nutrition"."--Foreword.
"January 1966."

Physical Description

iii, 29 pages ; 28 cm

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