Related Experiment Video
Updated: Jun 25, 2026
10:08
Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
Published on: May 18, 2022
Solar activity during gestation does not affect human lifespan: evidence from national data
1Section of Ecology, Department of Biology, University of Turku, 20014 Turku, Finland. sayrhe@utu.fi
Biogerontology
|February 10, 2009
Summary
This study found no link between prenatal solar activity and human lifespan. Researchers examined life expectancy data from 1751-1915, finding no evidence that sunspot numbers during gestation affected longevity.
Area of Science:
- Human longevity and environmental influences
- Solar activity and biological effects
Background:
- Previous research suggested a correlation between human lifespan and solar activity during prenatal development.
- Increased mutagenic ultraviolet (UVB) radiation during high solar activity was proposed as a key mechanism, potentially damaging DNA.
Purpose of the Study:
- To replicate findings suggesting a reduced lifespan for individuals born during periods of high solar activity.
- To investigate the relationship between sunspot numbers during gestation and human life expectancy at birth.
Main Methods:
- Utilized annual cohort life expectancy at birth data for men and women.
- Data spanned birth years from 1751 to 1915.
- Included cohorts from ten European nations.
Main Results:
- The study found no statistically significant evidence supporting a relationship between solar activity during gestation and human life expectancy at birth.
- Analysis across ten European countries did not replicate previous suggestions of reduced lifespan linked to prenatal solar activity.
Conclusions:
- The findings do not support the hypothesis that solar activity during prenatal development influences human lifespan.
- Further research may be needed to explore other potential environmental or genetic factors affecting longevity.
Related Concept Videos
00:51Energy Budgets and Reproductive Strategies
Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...
01:21Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
01:07Teratogenicity
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
02:20Longitudinal Research
Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...