HIIT Benefits Adults Over 65
New research finds that high-intensity interval training promotes fat loss while preserving lean muscle mass in adults over 65. The study shows HIIT protocols involving short bursts of intense effort followed by rest are adaptable to various fitness levels and equipment, including bodyweight-only exercises.
- After age 50, muscle mass decreases at an annual rate of 1–2%, and muscle strength declines by 1.5% per year, accelerating to 3% annually after age 60. This age-related muscle loss, known as sarcopenia, affects 5-13% of people aged 60-70 and up to 50% of those 80 or older. - At a cellular level, HIIT has been shown to improve the function of mitochondria, which are the energy generators in cells. For adults over 65, one study found that this type of training led to a 69% increase in their muscles' ability to take in oxygen. - The age-related loss of muscle mass is more pronounced in fast-twitch (Type II) muscle fibers, which are responsible for quick, powerful movements. HIIT helps to preserve these specific fibers, which is crucial for activities that require sudden bursts of energy. - Beyond muscle health, studies have shown HIIT can improve cognitive functions in older adults. As little as six weeks of high-intensity training for 20 minutes at a time was found to improve high-interference memory—the ability to distinguish between similar memories. - Compared to moderate-intensity continuous training, HIIT may be more effective at improving cardiorespiratory fitness and can lead to more significant improvements in V̇O₂peak (maximal oxygen uptake) for older adults. - Adaptable HIIT workouts for seniors can include low-impact activities like walking, swimming, or stationary cycling. A sample walking workout involves alternating between a challenging fast walk or incline for 1-2 minutes and a slower recovery pace for 2-3 minutes, repeated for about 30 minutes. - For safety and recovery, experts typically recommend that older adults incorporate HIIT workouts two to three times per week, not on consecutive days. - This type of training can also positively affect metabolic health by improving how the body regulates blood sugar. Studies in Denmark and Finland found that HIIT increased glucose metabolism in muscles and led to more controlled blood sugar levels after just a few weeks of training.
