# For Older Adults, Effort Matters More Than How Long Each Workout Lasts

*Association between physical activity bout length and physical functioning in older adults using absolute and relative intensity thresholds: A longitudinal cohort study.*

- **Evidence Level**: Moderate
- **Publication Types**: Journal Article
- **Journal**: The journals of gerontology. Series A, Biological sciences and medical sciences
- **Sample Size**: 295 community-dwelling adults aged 75, 80 and 85
- **Authors**: Hyvärinen M, Löppönen A, Aittokoski T, Brage S, Gonzales T, Rantanen T, Karavirta L
- **Published**: 2026-09-03
- **Topics**: Exercise, Aging, Physical Function
- **DOI**: https://doi.org/10.1093/gerona/glag219
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42690677/

## Summary

Fitness advice often obsesses over 10-minute blocks of activity. In adults aged 75 to 85 followed for four years, what mattered was how hard they worked relative to their own capacity, not how long each bout lasted. Those doing more activity that felt hard for them kept more of their walking ability. Measuring effort by standard intensity cut-offs showed no link at all.

## Practical Takeaway

This study suggests effort relative to your own fitness may matter more than workout length.

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