Trowbridge, T. S. | Search NASA

NASA NTRS1993

Isotonic And Isokinetic Exercise During Bed Rest

Brief, intense activity prevents deterioration of peak oxygen uptake, a measure of work capacity. Study intended to explore effectiveness of exercise in maintaining fitness during long missions in microgravity so crewmembers able to keep up arduous work of building and expanding Space Station. Showed that intermittent, intense exercise of short duration more effective than similar exercise at lower intensity for longer times measured in previous studies. Intense short-term exercise seems to maintain volumes of plasma and red blood cells at normal levels.

Greenleaf, J. E.↗

NASA NTRS1989

Work capacity during 30 days of bed rest with isotonic and isokinetic exercise training

Results are presented from a study to determine whether or not short-term variable intensity isotonic and intermittent high-intensity isokinetic short-duration leg exercise is effective for the maintenance of peak O2 (VO2) uptake and muscular strength and endurance, respectively, during 30 days of -6 deg head-down bed rest deconditioning. The results show no significant changes in leg peak torque, leg mean total work, arm total peak torque, or arm mean total work for members of the isotonic, isokinetic, and controls groups. Changes are observed, however, in peak VO2 levels. The results suggest that near-peak variabile intensity, isotonic leg excercise maintains peak VO2 during 30 days of bed rest, while peak intermittent, isokinetic leg excercise protocol does not.

Greenleaf, J. E.↗