The Effects of High-Intensity Interval Training May Surprise You
From 2016, men’s health warned that high-intensity interval training should be done sparingly because of how stressful it is. Some physical trainers have warned that exercising too intensely could oversaturate the body with stress hormones like cortisol (for Initiated). A study 2021 published in the Scandinavian Journal of Medicine and Science in Sports found that cortisol levels rise significantly right after high-intensity interval training, then drop below baseline before returning to baseline afterward. 24 hours. But what happens when you push the limits with high intensity training?
A study 2021 published in the journal Cell Metabolism found that excessive exercise – 152 minutes of high-intensity interval training per week – had “negative effects on metabolic health and physical performance adaptation”. Notably, the participants showed cellular dysfunction in the mitochondria – commonly referred to as the powerhouse of the cell. In short, too much high-intensity interval training can drain you of energy, which can negatively affect your health, metabolism, and performance (via Initiated).
Health Line says the most common symptoms of overtraining range from chronic fatigue and impaired sleep to lack of motivation. If you feel too tired to train and lack the strength, consider taking a break from high-intensity interval training. Remember not to push yourself further than your body can handle.