The effect of long-term microgravity exposure on cardiac autonomic function by analyzing 48-hours electrocardiogram (Biological Rhythms 48hrs) - 08.20.14
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Biological Rhythms 48 hours studies the effects of long-term microgravity exposure on heart function by analyzing an astronaut’s electrocardiogram for 48 hours. While space station keeps Houston time, it remains unknown whether a separate biological rhythm is imposed on long-term flight crews. To study this astronauts wear an Actiwatch sleep monitor for 96 hours and a Holter electrocardiograph for 48 hours in the middle of that sequence.
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Japan Aerospace Exploration Agency (JAXA), Tsukuba, , Japan
Sponsoring Space Agency
Japan Aerospace Exploration Agency (JAXA)
ISS Expedition Duration
May 2012 - October 2015
Previous ISS Missions
We conducted continuous 24-hour RR intervals measurement in ten crews for preliminary data of this project. The preliminary data showed various changes on biological rhythms and some biological rhythm of crews showed prolonged for 24hours or more than those before and after flight.
- To clarify the change of an accurate biological clock from space circumstance.
- We will evaluate continuous 48-hour RR intervals measurement on Holter ECG ,and sleep/wake rhythm on actiwatch for 96-hour.
- This research will be analyzed for improving the health care technology of long duration astronauts, for checking out the difference of them between before and after the flight on the earth and during long-duration space flight.
Monitoring cardio autonomic functions is important for improving crew health technology during long-duration space flight.
The crew health care technology for the biological rhythm disruption during space flight provides general public with useful hint to promote healthy daily lifestyle.
Holter ECG. Image courtesy of JAXA.
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