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Articles in PresS, published online ahead of print September 13, 2002
J Appl Physiol, 10.1152/jap.00643.2002
Submitted on July 15, 2002
Accepted on September 11, 2002
1 Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
* To whom correspondence should be addressed. E-mail: mll11{at}psu.edu.
The objective of the study is to examine the effects of age and gender on finger coordination. Twelve young (24±8 yr, 6 males and 6 females) and 12 elderly (75±5 yr, 6 males and 6 females) subjects performed single-finger maximal contraction (MVC), four-finger MVC and four-finger ramp force production tasks by pressing on individual force transducers. A drop in the force of individual fingers during four-finger MVC tasks as compared to single-finger MVC tasks (force deficit) was larger while unintended force production by other fingers during single-finger MVC tasks (enslaving) was smaller in elderly than in young subjects and in females than in males. Force deficit was smaller and enslaving was larger in subjects with higher peak force. During the ramp task, the difference between the variance of total force and the sum of variances of individual forces showed a logarithmic relation to the level of total force, across all subject groups. These findings suggest that indices of finger coordination scale with force generating capabilities across gender and age groups.
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