Effects of concurrent cognitive task on pre-landing muscle response latency during stepping down activity in older adults with and without a history of falls
| Autor: | William W.N. Tsang, Amy S. N. Fu, K. Y. Karen Lee |
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| Rok vydání: | 2009 |
| Předmět: |
Male
medicine.medical_specialty Muscle response Medial gastrocnemius Poison control Electromyography Walking Task (project management) Physical medicine and rehabilitation Adaptation Psychological Task Performance and Analysis medicine Brief Psychiatric Rating Scale Humans Latency (engineering) Muscle Skeletal Gait Postural Balance Aged medicine.diagnostic_test business.industry Rehabilitation Cognition medicine.anatomical_structure Case-Control Studies Accidental Falls Female Ankle business Ankle Joint Muscle Contraction |
| Zdroj: | Disability and rehabilitation. 30(15) |
| ISSN: | 0963-8288 |
| Popis: | To investigate the co-contraction of ankle muscles in older subjects with and without a history of falls during a stepping down activity, and whether the co-contraction was disrupted by a concurrent cognitive task.Ten fallers and 9 non-fallers (mean age = 72.0 +/- 5.0 and 72.1 +/- 7.3 years, respectively) were recruited. Electromyography (EMG) of the tibialis anterior (TA) and medial gastrocnemius (MG) was recorded during stepping down with and without a concurrent cognitive task. Co-contraction was investigated using the time between the EMG onset and the foot touching a force-platform, termed the pre-landing muscle response latency.The fallers showed longer pre-landing muscle response latencies in the TA compared with non-fallers (141.1 +/- 58.1 ms and 110.9 +/- 68.2 ms, respectively). With a concurrent cognitive task, the pre-landing muscle response latencies in the TA were shortened in fallers significantly more than in non-fallers (44.4% and 15.5%, respectively). No significant difference in MG activation was found between 2 groups in the stepping down activity with and without cognitive task.Subjects with history of falls exhibit a greater shortening in the pre-landing muscle response latency than non-fallers when distracted during stepping down. Disruption of their co-contraction in ankle joint might precipitate such older adults to fall. |
| Databáze: | OpenAIRE |
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