期刊
JOURNAL OF MOTOR BEHAVIOR
卷 43, 期 5, 页码 357-360出版社
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/00222895.2011.598893
关键词
aging; ankle; finger; dorsiflexion; motor output variability
资金
- [R01 AG031769]
- NATIONAL INSTITUTE ON AGING [R01AG031769] Funding Source: NIH RePORTER
The authors' purpose was to determine the interaction of age and limb used on positional variability at different loads. Eleven young adults and 10 older adults were asked to accurately match and maintain a horizontal target line with 5 degrees abduction of their index finger and 5 degrees dorsiflexion of their ankle for 20 s at loads ranging from 2 to 50% of the maximal load that could be lifted with each limb. The visual gain was kept constant at 1 degrees (visual angle). Positional variability was greater in older adults for both limbs, nonetheless age-associated differences were greater for the ankle dorsiflexion task compared with the abduction of the index finger task. In addition, we found that, independent of age, motor output variability was greater with the lower limb. These results provide novel evidence that older adults may exhibit greater impairments in motor control with the foot compared with the finger. Furthermore, these findings support the idea, using a different task than previous literature, that the lower limb has greater motor output variability than the upper limb.
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