NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Current ISS Exercise Countermeasures: Where are we now?Current International Space Station (ISS) crew schedules include 1.5 h/d for completion of resistive exercise and 1 h/d of aerobic exercise , 6 d/wk. While ISS post flight decrements in muscle strength, bone m ineral density, and aerobic capacity improved in some crewmembers, de conditioning was still evident even with this volume of exercise. Res ults from early ISS expeditions show maximum loss in bone mineral density of the lumbar spine and pelvis in excess of 1.5% per month, with all crewmembers demonstrating significant bone loss in one or more re gions. Similarly, post flight muscle strength losses in the hamstring and quadriceps muscle groups exceeded 30% in the immediate post miss ion period in some crewmembers. Measures of aerobic capacity early in the mission show average decrements of 15%, but with onboard aerobic exercise capability, the crew has been able to "train up" over the co urse of the mission. These findings are highly variable among crewmem bers and appear to be correlated with availability and reliability of the inflight resistive exercise device (RED), cycle ergometer, and t readmill. This suite of hardware was installed on ISS with limited op erational evaluation in groundbased test beds. As a result, onorbit hardware constraints have resulted in inadequate physical stimulus, d econditioning, and increased risk for compromised performance during intra and extravehicular activities. These issues indicate that the c urrent ISS Countermeasures System reliability or validity are not ade quate for extendedduration exploration missions. Learning Objective: A better understanding of the status of ISS exercise countermeasures , their ability to protect physiologic systems, and recommendations for exploration exercise countermeasures.
Document ID
20080026122
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Hayes, J. C.
(NASA Johnson Space Center Houston, TX, United States)
Loerch, L.
(Wyle Life Sciences, Inc. Houston, TX, United States)
Davis-Street, J.
(Houston Univ. Houston, TX, United States)
Haralson, Cortni
(Wyle Life Sciences, Inc. Houston, TX, United States)
Sams, C.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
May 14, 2006
Subject Category
Aerospace Medicine
Meeting Information
Meeting: 77th Annual Scientific Meeting of the Aerospace
Location: Orlando, Fl
Country: United States
Start Date: May 14, 2008
End Date: May 18, 2008
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available