Definition. 1  Troponins are specific proteins found in heart muscle. Troponin testing is done to diagnose heart attacks (myocardial infarctions). 2  When heart muscle is damaged, as in a myocardial infarction (MI), troponins leak out of cells and into the bloodstream.
Variable Ratio Schedule (VR) This is going to be a little confusing at first, but hang on and it will become clear. A variable ratio schedule (VR) is a type of operant conditioning reinforcement schedule in which reinforcement is given after an unpredictable (variable) number of responses are made by the organism. This is almost identical to a Fixed-Ratio Schedule but the reinforcements are given on a variable or changing schedule.
You wonât want to miss out on more than 100 hours of VR programming and 360 âdegree storytelling, which include the Opening and Closing Ceremonies, the menâs basketball final, gymnastics, track and field, beach volleyball, diving, boxing and fencing, in addition to highlight packages of these sports (scroll down for daily schedule).