NASA Photo ID: STS040-211-019      File Name: 10064351.jpg
  Film Type: 35mm                    Date Taken: 06/14/91
  Title: STS-40 Mission Specialist (MS) Seddon on ergometer conducts Exp. No. 066
  Description:
  Astride the bicycle ergometer, STS-40 Mission Specialist (MS) M. Rhea
  Seddon  breathes into the cardiovascular rebreathing unit (CRU) during the
  exercise  phase of Experiment No. 066, Inflight Study of Cardiovascular
  Deconditioning. It focuses on the deconditioning of the heart and lungs and
  changes in  cardiopulmonary function that occur upon return to Earth. By
  using  noninvasive techniques of prolonged expiration and rebreathing,
  investigators  can determine the amount of blood pumped out of the heart
  (cardiac output),  the ease with which blood flows through all the vessels
  (total peripheral  resistance), oxygen used and carbon dioxide released by
  the body, and lung  function and volume changes.  Measurements are made
  both while crewmembers  are resting and while they pedal the ergometer. 
  Shirtless, MS James P.  Bagian conducts a second experiment in the
  background.          
  Subject terms:
  ASTRONAUTS                              
  COLUMBIA (ORBITER)                      
  CREW PROCEDURES (INFLIGHT)              
  CREWS                                   
  ERGOMETERS                              
  ONBOARD ACTIVITIES                      
  SPACEBORNE EXPERIMENTS                  
  SPACELAB                                
  STS-40                                  
  

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