Articles: adult.
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The exceedingly large grip forces that many older adults employ when lifting objects with a precision pinch grip (Cole, 1991) may compensate for a reduced capability to produce a stable isometric force. That is, their grip force may fluctuate enough from moment to moment to yield grip forces that approach the force at which the object would slip from grasp. We examined the within-trial variability of isometric force in old (68-85 years, n = 13) and young (n = 11) human subjects (a) when they were asked to produce a constant pinch force at three target levels (0.49, 2.25, and 10.5 N) with external support of the arm, hand, and force transducer and (b) when they were asked to grasp, lift, and hold a small test object with a precision grip. ⋯ Thumb and finger forces for grip are produced through coactivation of many muscles and thus promote smooth force output through temporal summation of twitches. We conclude that peripheral reorganization of muscle in older adults does not yield increased instability of precision grip force and therefore does not contribute directly to increased grip forces in this population. However, force instability may affect other grip configurations (e.g., lateral pinch) or manipulation involving digit abduction or adduction forces.
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The complexities of current societal trends impose a daunting challenge to providers of maternal child health services. Demographers, anthropologists, sociologists, policy makers, and health care providers struggle to grasp the multiple issues in an effort to create useful strategies for the 21st century. ⋯ Legislative and policy efforts have focused new and much-needed attention on women as recipients and providers of health care. The realities of mothers in the work force, the epidemic of adolescent pregnancy, the swelling ranks of women and children in poverty, the increasing number of women with acquired immune deficiency syndrome, the new advances in reproductive technology, and the effect of population and immigration trends greatly influence the childbearing client of the future and create enormous pressures for critical problem solving.