The cardiac stress test is done with heart stimulation, either by exercise on a treadmill, pedalling a stationary exercise bicycle ergometer, or with intravenous pharmacological stimulation, with the patient connected to an electrocardiogram ( ECG ).
12.
The crew performed many repetitions per day of their favorite maneuvers on the MK-I and to a lesser extent, on the MK-II . Also, the average amount of work done on the bicycle ergometer was more than doubled on Skylab 3, with all crewmembers participating actively.
13.
Other instruments include a swivel chair for vestibular function tests, lower body negative pressure gear for cardiovascular studies, bicycle ergometer integrated physical trainer ( electrically driven running track 1 m X . 3 m with elastic cords providing 50 kg load ), penguin suits and alternate athletic suit, sensors for temperature and characteristics of upper atmosphere, ITS-K infrared telescope spectrometer and ultraviolet spectrometer for study of earth's infrared radiation, multispectral earth resources camera, cosmic ray detector, embryological studies, new engineering instruments tested for orientation of station by celestial objects and in darkness and a teletypewriter.
