Kidney damage is the last thing you want from doing supposedly “good” exercise with high intensity interval training (HIIT).
A study recently published in the American Journal of Medicine found instances of a condition called rhabdomyolysis, which is normally associated with military training camps, among newcomers to HIIT. Sufferers experience pain due to intracellular muscle constituents breaking down and leaking into their blood stream. It is as though their muscles are ‘melting’; left unchecked, the syndrome can lead to kidney damage.
Researchers found a number of case studies of patients who went to A&E departments with symptoms of rhabdomyolysis following their first spin classes.
The issue is simply that people are doing workouts that they’re not conditioned for. There is no emphasis on flexibility, mobility or activation in many HIIT classes; yet all are incredibly important in keeping the body fit and healthy as you age.
What’s more, I regularly see people “smashing” multiple HIIT classes a day, 5-6 days per week. HIIT should not be done more than three times per week (at most), because it is so strenuous. It puts an incredible strain on your nervous system, joints and muscles; especially if you are overweight and unfit.