Evolution of human lifespan: past, future, and present

Article Abstract:

Evolutionary genetics may ultimately hold the key to understanding changes in the lifespan of humans. Human aging appears to result from reduced force of natural selection, based on laboratory breeding experiments which delay aging processes. Increased brain size, a direct result of evolution, has led to an increase in the human lifespan. Evolutionary theory has also been able to substantiate the mortality plateaus which appear late in human life.

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Male lifespan and the secondary sex ratio

Article Abstract:

The association between the sex ratio of birth cohorts in Sweden and the lifespan of their members in the longest known time-series of such data is measured. The test has found no support for the damaged cohort theory and the analyses has discovered an inverse association between cohort sex ratio and lifespan of male members.

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Effect of physical acitivity on bone mineral density assessed by limb dominance across lifespan

Article Abstract:

Research measuring the bone density of dominant and nodominant arms in older and younger women is presented. Bone density was heaviest in the dominant arm of the older women, implying that the difference in bone mineral density accumulates over years of loading physical activity and energy expenditure onto the dominant arm.

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