Anticipatory postural adjustments during a Fitts' task: Comparing young versus older adults and the effects of different foci of attention
| Autor: | Jonathan C. Singer, Steven R. Passmore, Kathryn M. Sibley, Cheryl M Glazebrook, Saleh M. Aloraini |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Adult
Male medicine.medical_specialty Time Factors Adolescent Movement education Biophysics Psychological intervention Experimental and Cognitive Psychology Electromyography Postural control Task (project management) 03 medical and health sciences Young Adult 0302 clinical medicine Physical medicine and rehabilitation medicine Humans Orthopedics and Sports Medicine Attention Young adult Fitts's law Postural Balance Motor skill Balance (ability) Aged medicine.diagnostic_test 030229 sport sciences General Medicine Middle Aged Biomechanical Phenomena Motor Skills Female Psychology psychological phenomena and processes 030217 neurology & neurosurgery Psychomotor Performance |
| Zdroj: | Human movement science. 64 |
| ISSN: | 1872-7646 |
| Popis: | Anticipatory postural adjustments (APAs) are an integral part of standing balance. Previous research with balance control has shown that adopting an external focus of attention, compared to an internal focus of attention, yields better performance during motor skills. Despite the importance of APAs, especially among older adults, and the potential benefits of adopting an external focus of attention, studies investigating methods for improving APAs are limited. The aim of this study was to compare behavioral, kinematic and APAs measures while adopting different foci of attention among young and older adults when performing a lower extremity Fitts’ task. Ten young adults (mean age 24 years ± 4.37) and ten older adults (mean age 75 years ± 5.85) performed a lower-extremity reaching task (Fitts’ task) while adopting an external focus (focus on target) and an internal focus (focus on limb) in a within-subject design. A motion capture system was used to record participants’ movement data. Custom software derived movement time (MT), peak velocity (PV), time to peak velocity (ttPV) and variability at target (SDT). Electromyography (EMG) was used to determine APAs onset and magnitude. The findings showed that an external focus of attention led to significantly shorter MT, higher PV, shorter ttPV and more accuracy when reaching the target (SDT) for both age groups. Also, EMG results showed that, with an external focus, APAs onset occurred earlier and APAs magnitude was more efficient. As predicted by Fitts’ Law, participants spent more time executing movements to targets with higher indices of difficulty. Older adults compared to young adults were more adversely affected by the increase of difficulty of the Fitts’ task, specifically, on measures of APAs. In conclusion, adopting an external focus of attention led to better overall movement performance when performing a lower extremity Fitts’ task. The task used in the present study can distinguish between APAs for older and young adults. We recommend that future studies expand on our findings in order to establish a performance-based objective measure of APAs to assess clinical interventions for postural control impairment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect