![Dr. Michael Joyner talks with a colleague in the lab. ] LEILA NAVIDI • leila.navidi@startribune.com BACKGROUND INFORMATION: Dr. Michael Joyner conducts a study simulating less oxygen in the blood and it's effects on a left shift patient in the Human Physiology Research Lab at the Mayo Clinic Hospital, Saint Marys Campus in Rochester on Monday, June 4, 2018. Dr. Joyner is a Mayo Clinic expert on the limits of human performance and has written extensively on elite athletic performance.](https://arc.stimg.co/startribunemedia/CRCPNC4U6CPUOW4UX22O6YV5BM.jpg?&w=80&ar=1:1&fit=crop)
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