Practice and Age-Related Loss of Adaptability in Sensorimotor Performance

被引:28
作者
Sosnoff, Jacob J. [1 ,2 ]
Voudrie, Stefanii J. [1 ]
机构
[1] Univ Illinois, Dept Kinesiol & Community Hlth, Urbana, IL 61801 USA
[2] Univ Illinois, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA
基金
美国国家卫生研究院;
关键词
force control; loss of complexity; variability; MOTOR UNIT DISCHARGE; HAND MUSCLE; FORCE FLUCTUATIONS; TIME SCALES; VARIABILITY; OUTPUT; YOUNG; TASK; INTERMITTENCY; COMPLEXITY;
D O I
10.3200/JMBR.41.2.137-146
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The purpose of the present investigation wits to examine whether the ability to adapt to task constraints is influenced by short-term practice in older adults. Young (18-29 years old) and old (65-75 years old) adults produced force output to a constant force target and a 1-Hz sinusoidal force target by way of the index finger flexion. Participants completed each task 5 times per session for 5 concurrent sessions. The amount and structure of force variability was calculated using linear and nonlinear analyses. As expected, there wits a decrease in the magnitude of variability (coefficient of variation) in both tasks and task-related change in the Structure of force variability (approximate entropy) with training across groups. The authors found older adults to have a greater amount of variability than their younger counterparts in both tasks. Older adults also demonstrated all increase in the structure of force Output ill the constant task but it decrease in structure in the sinusoidal task. Age differences in the adaptability to task constraints persisted throughout practice. The authors propose that older adults' ability to adapt sensorimotor Output to task demands is not it result of lack of familiarity with the task but that it is, instead, characteristic of the aging process.
引用
收藏
页码:137 / 145
页数:9
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