Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25521
Title: Mental set can modulate response onset in the lower limb muscles to falls in humans
Authors: Fu, SN 
Hui-Chan, CWY
Keywords: Electromyographic responses
Falls
Impact force
Landing
Mental set
Unexpected and self-initiated drops
Issue Date: 2002
Publisher: Elsevier
Source: Neuroscience letters, 2002, v. 321, no. 1-2, p. 77-80 How to cite?
Journal: Neuroscience letters 
Abstract: The objective of this study was to investigate the modulation of the ankle muscle electromyographic (EMG) response as a function of mental set. Thirteen young healthy subjects underwent 40 unexpected and self-initiated drops from 30 cm above two separate force-plates. Following unexpected drops, reflex activities were observed in the medial gastrocnemius (MG) and tibialis anterior (TA) at mean latencies (±SD) of 83.59±10.1 and 99.43±21.82 ms, respectively. Following self-initiated drops, the response latency of the MG was significantly shortened (to 71.98±10 ms, P<0.05), and the TA was significantly lengthened (to 183.33±45 ms, P<0.05) when compared with unexpected drops. Such a modulation was associated with a significant reduction of the impact force on landing as compared with unexpected drops (by 17%, P<0.05). Interestingly, a negative correlation was found between the onset of the TA EMG response and the magnitude of the impact force on landing during expected (r=-0.66, P<0.05) but not unexpected drops.
URI: http://hdl.handle.net/10397/25521
ISSN: 0304-3940
EISSN: 1872-7972
DOI: 10.1016/S0304-3940(02)00060-5
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