# Why Higher-Intensity Workouts May Protect Fitness Better as You Age

*Exercise Intensity and 5-Year Trajectories in Peak Oxygen Uptake in Older Adults: Analysis from the Generation 100 Study.*

- **Evidence Level**: Moderate
- **Publication Types**: Journal Article
- **Journal**: Medicine and science in sports and exercise
- **Sample Size**: 500 adults aged 70-77
- **Authors**: Midttun S, Lydersen S, Kaminsky LA, Wisløff U, Stensvold D
- **Published**: 2026-05-18
- **Topics**: exercise, cardiorespiratory fitness, aging
- **DOI**: https://doi.org/10.1249/MSS.0000000000004028
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42189670/

## Summary

Older adults aged 70 to 77 who did high-intensity training held onto their aerobic fitness much better over 5 years than those doing moderate workouts. Women doing high-intensity training showed essentially no decline in VO2 peak, while moderate exercisers dropped 4.6%. Intensity mattered more than total exercise time for slowing the age-related drop in fitness.

## Practical Takeaway

This study suggests including higher-intensity workouts may help preserve aerobic fitness in older age.

---

_Canonical: https://longevity-austria.com/en/research/why-higher-intensity-workouts-may-protect-fitness-better-as-you-age · Part of Longevity Cities · Updated 2026-05-18_