CARDIODYNAMIC AND METABOLIC EFFECTS OF PROLONGED BED REST WITH DAILY RECUMBENT OR SITTING EXERCISE AND WITH SITTING INACTIVITY.
Abstract
Eight healthy mean were studied to evaluate the modifying effects of supine or sitting exercise or quiet sitting on the circulatory and metabolic consequences of prolonged bed rest. Four subjects remained at recumbent bed rest for 24 days except for 1 hour daily lying (2 subjects) or sitting (2 subjects) bicycle ergometer exercise, and four subjects remained at recumbent bed rest for 16 hours and sat quietly in a chair for 8 hours daily for 30 days. All subjects underwent physical training for 18 days before and after these periods of inactivity. Just before and after the period of inactivity, the response to 70 degree head-up body tilt and maximal O2 uptake were determined. One hour daily of lying or sitting exercise prevented the deterioration of physical work capacity previously found during six weeks of bed rest alone. Supine exercise did not prevent the development of tilt intolerance but sitting exercise was effective in one of two subjects. Eight hours daily of quiet sitting added to bed rest resulted in only minor decreases in physical work capacity and maintained tilt tolerance in three of four subjects. Supine or sitting exercise or quiet sitting did not prevent the increased urinary calcium excretion. There was no consistent change in nitrogen balance. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0607239
Entities
People
- B. Issekutz Jr.
- G. J. Haupt
- J. J. Blizzard
- J. W. Daly
- N. C. Birkhead