High intensity interval training (HIIT) is associated with which type of conditions?

• A. Rotator cuff tendinopathy, tennis elbow, stroke, type 2 diabetes, chronic kidney disease
• B. Osteoporosis, Osteoarthritis, Hip fracture
• C. Alzheimer's disease
• D. Non-alcoholic fatty liver disease

Answer: (A)

High intensity interval training is a versatile approach that has been studied across a wide range of health conditions. In metabolic health, HIIT can improve insulin sensitivity and glycemic control in type 2 diabetes, and it’s also been examined in people with chronic kidney disease to enhance aerobic capacity under supervision. In neurological rehabilitation, HIIT protocols have shown potential to safely boost cardiovascular fitness and functional outcomes after stroke. There’s also a relationship between high-load, repetitive training and tendinopathies of the upper limb, so conditions like rotator cuff tendinopathy and tennis elbow can be associated with high-intensity programs if not progressed carefully.

The other options are less representative of the broad spectrum where HIIT evidence is strongest; for example, skeletal fragility conditions like osteoporosis or hip fracture raise safety concerns with high-impact work, Alzheimer’s disease isn’t primarily linked to HIIT research, and while NAFLD can improve with HIIT, the combination of conditions in the first option best reflects the varied contexts in which HIIT has been studied.