Timed daily exercise and lifespan in male and female fruit flies
In three-day-old virgin fruit flies, forced daily activity at the morning activity peak lengthened male lifespan by about 35% but shortened female lifespan by about 84%; activity at midday 'siesta' time shortened lifespan in both sexes. [1]
Automatic summary · not editorially reviewed
The key findings
Three-day-old virgin fruit flies, separated by sex, were assigned to a control group or an exercise group receiving daily motor stimulation at ZT1 or ZT6. [1]
Forced activity at ZT1 lengthened male lifespan by about 35% but shortened female lifespan by about 84%. [1]
Activity at 'siesta' time shortened lifespan in both sexes, by about 20% in males and about 67% in females. [1]
The source at a glance
- Study type / format
- Abstract of an experimental lifespan study in fruit flies
- Population / context
- Three-day-old virgin male and female Drosophila melanogaster fruit flies.
- Summary based on
- Study abstract
- Original publication
- September 14, 2026
Flies exercised at two daily time points
The study asked how the circadian clock affects the body's adaptation to physical activity, a question the authors describe as little studied. Three-day-old virgin Drosophila melanogaster flies, separated by sex, were assigned to a control group or an exercise group. Exercised flies received daily motor stimulation either at ZT1, the morning activity peak, or at ZT6, the midday 'siesta' time. Overall lifetime physical activity of the controls was lower in males than in females.
Supporting source [1]
Opposite lifespan effects by sex at ZT1
Forced physical activity at ZT1 prolonged male lifespan by about 35%, while females in the same group showed a lifespan reduction of about 84%. Activity performed at 'siesta' time shortened lifespan in both sexes, by about 20% in males and about 67% in females. The authors state that activity during the time of peak natural daily activity prolonged life expectancy in males but had a negative effect on female longevity, and that activity during 'siesta' shortened lifespan regardless of sex.
Supporting source [1]
Fly findings and the authors' human caveat
The authors suggest that timing physical activity to the daily rhythm of activity and rest set by the circadian clock could be a new strategy for optimizing the effects of physical training. They add that this interpretation requires further research involving human subjects of different chronotypes. The reported lifespan changes come from fruit flies, not people, so they do not show that timed exercise lengthens or shortens human lifespan.
Supporting source [1]
How to interpret this
This is an abstract only; the full text was not reviewed. The results come from male and female Drosophila melanogaster, not humans, and the authors themselves say the interpretation requires further research in human subjects of different chronotypes.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Widacha L, Majerczak J, Szramel J, Krzeptowski W, Zoladz JA, Pyza E. · europepmc.org · September 14, 2026