HIIT Helps Older Adults Burn Fat While Preserving Their Muscular System

A new study suggests high-intensity interval training (HIIT) could help older adults reduce body fat while keeping muscle mass intact. Published in Maturitas, the research followed over 120 healthy participants with an average age of 72. The findings highlight a potential solution to age-related changes in body composition, which often lead to higher fat levels and lower muscular system mass.

As people age, natural shifts in body composition increase the risk of conditions like heart disease, weak bones, and muscle loss. Yet, until now, little research has focused on the best exercises to counteract these changes in older populations.

The six-month study involved adults averaging 72 years old with a BMI of 26 kg/m². Participants were split into groups performing different exercise intensities. While all groups saw small reductions in body fat, only the HIIT group maintained their lean muscular system mass over the period.

HIIT works by placing greater stress on muscles, prompting the body to preserve muscle tissue. This makes it potentially more effective than moderate or low-intensity workouts for older adults. However, researchers noted that HIIT may not suit everyone, and its long-term effects on diverse aging groups remain unclear.

Body composition—a measure of fat versus lean mass—offers a clearer picture of health than BMI alone. Despite this, studies on HIIT's specific impact on fat and muscular system in older adults have been scarce in recent years. Most research has instead focused on how regular exercise slows cognitive decline rather than its effects on body composition.

Experts still recommend regular physical activity for older adults to stay healthy. But with limited evidence on the best exercise types, those considering HIIT or other intense routines should first consult a healthcare professional or trainer.

The study adds to growing evidence that HIIT could be a valuable tool for older adults looking to manage fat gain without losing muscular system. However, more research is needed to confirm its suitability and long-term benefits across different aging populations. For now, tailored advice from professionals remains essential before starting any high-intensity programme.