Broken-hearted teenagers

Teens with type 2 diabetes are already showing signs of impaired cardiac function, according to a study presented at the Endocrine Society’s 93rd Annual Meeting in Boston this month. 

Researchers at the University of Auckland studied how the heart and blood vessels of 13 teenagers with type 2 diabetes adapted to exercise, compared with 27 overweight or obese teens without diabetes and a control group of 19 non-diabetic, non-obese teens. 

Participants were aged 12–20 and were from New Zealand. 

Dual-energy x-ray absorptiometry scans were used to assess their body composition, and MRIs were taken of their heart and a femoral artery during or immediately following an exercise test on a stationary bike. 

When participants were at rest, cardiac output was within the normal range in all three groups, although still lower in the diabetic group. Images of the femoral artery showed that the flow of blood through the