Many runners are suffering from long covid, which researchers are studying to find effective treatments and a cure.
Elise McDonnell was slowly trying to return to running after contracting the coronavirus in August.
Her heart was also beating faster, she said, something she hadn't been concerned with early in her bout with covid-19, thinking that it was because of her illness. "My heart rate was so high, even at rest. It was getting high just from my getting up from the couch," McDonnell said. "And I just wasn't listening to myself."
By inserting a small catheter in the wrist artery during exercise, Joseph and a team of researchers assessed how much oxygen the body absorbs throughout exercise. Many of the patients had been athletes in the past and were absorbing less oxygen post-covid, Joseph said. "There is some kind of abnormal flow across the muscle bed where oxygen is just not being delivered appropriately or absorbed appropriately," he said. The mitochondria "don't absorb oxygen.
Longtime ultrarunner James Tenney, 57, of Las Vegas had a mild case of covid from the omicron variant in December. "It was all above my neck," he says, "nothing respiratory." Two months later, Tenney, who has been a runner for 35 years and who was vaccinated and had a booster shot, ran the Jackpot Ultra, a 100-miler in Las Vegas.
Joseph said he tells patients "to try to know what your limit is in terms of when you are going to develop those post-exertional symptoms, and exercise to just below that limit." They could then gradually increase that over the course of weeks to months "instead of pushing yourself to the limit, to breathlessness," he said. "That might actually be harmful because it tends to set you two steps back.
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