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Bed Rest Standard Measures: Functional Stretch Reflex (BRSMFSR)
Principal Investigator
Research Area:
Species Studied
Scientific Name: Homo sapiens Species: Human

The objective of this study was to compare the effects of weightlessness on the amplitude and latency of the Functional Stretch Reflex (FSR) with those subjects participating in head down bed rest studies.

The goal of this investigation was to characterize in a control group of subjects the effects of long-duration head-down bed rest on the sensorimotor functional reflex responses and to compare the responses obtained in the control group with those of a treatment group receiving a vibratory countermeasure designed to protect bone mineral density (BMD).

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Reschke MF, Bloomberg JJ, Paloski WH, Mulavara AP, Feiveson AH, Harm DL. Postural reflexes, balance control, and functional mobility with long-duration head-down bed rest. Aviat Space Environ Med 2009; 80(5, Suppl.):A45-54. []

Reflex, stretch

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Data Information
Data Availability
Archive is complete. Data sets are not publicly available but can be requested.
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Amplitude power
Anatomical zero
Average peak amplitude
Average peak latency
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Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Campaign 1 08/29/2004 11/21/2004 84 days
Campaign 3 02/20/2005 04/14/2010 5 years, 1 month, 25 days
Campaign 5 04/30/2006 12/23/2007 1 year, 7 months
Pilot 02/05/2006 12/22/2006 320 days

Additional Information
Other Key People
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Pamela A. Bieri
Institutional Support
National Aeronautics and Space Administration (NASA)