New Insights on Aging and Physical Performance from Swedish Study

A comprehensive study from Sweden, spanning nearly five decades, has revealed some important truths about aging and physical performance. Researchers discovered that fitness, strength, and muscle endurance typically start to decline around the age of 35. On a brighter note, they found that getting active later in life can lead to significant improvements in physical abilities.

This research was conducted at Karolinska Institutet as part of the Swedish Physical Activity and Fitness study (SPAF). The study involved hundreds of randomly selected men and women from ages 16 to 63, who were monitored for their fitness and strength over 47 years.

The findings were published in the Journal of Cachexia, Sarcopenia and Muscle.

Unique Long-Term Fitness Data

While many previous studies on aging have focused on cross-sectional comparisons between different age groups, the SPAF project stands out for repeatedly assessing the same individuals over an extended period. This longitudinal approach has allowed for a more detailed understanding of how the body evolves throughout adulthood and into older age.

Physical Decline Begins Around Age 35

Results indicated that physical capacity can start to decrease as early as 35, affecting people regardless of their training history. This decline gradually intensifies as individuals age.

The researchers analyzed changes in fitness, muscular strength, and endurance, all of which exhibited a similar downward trajectory over time.

Exercise Still Makes a Difference

However, the study highlights that exercising at any age is still greatly advantageous. Those participants who became active during adulthood experienced improvements in their physical capacity ranging from 5 to 10 percent.

“It’s never too late to start exercising. Our study indicates that while physical activity may not completely prevent performance decline, it can certainly slow it down. We aim to uncover why peak performance seems to occur around age 35 and why activity can slow down performance loss,” said Maria Westerståhl, a lecturer at the Department of Laboratory Medicine and one of the researchers involved.

The team plans to keep tracking the participants as they advance in age, with a new round of testing set for next year when they reach 68.

Researchers hope that continued analysis will shed light on how lifestyle choices, overall health, and biological factors affect changes in physical performance throughout a person’s life.