Document Detail

The effects of preview and task symmetry on trunk muscle response to sudden loading.
MedLine Citation:
PMID:  2707815     Owner:  NLM     Status:  MEDLINE    
The effect of warning time (preview) and task symmetry on the trunk muscular response to sudden loading conditions was investigated. Eleven subjects were asked to catch falling weights with four levels of preview (0, 100, 200, and 400 ms) in saggitally symmetric posture and asymmetric posture. For each of the eight muscles sampled with surface electrodes, the integrated electromyographic (EMG) signal was interpreted in terms of its peak value, mean value, onset rate, and lead/lag time with reference to the weight drop. Results show linear relationships between preview times and peak EMG, preview times and mean EMG, and preview times and lead times. The results show significant change when going from symmetric to asymmetric conditions across most dependent measures. Analysis of peak changes in compression were performed across all conditions but yielded unexpected results.
S A Lavender; G A Mirka; R W Schoenmarklin; C M Sommerich; L R Sudhakar; W S Marras
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Human factors     Volume:  31     ISSN:  0018-7208     ISO Abbreviation:  Hum Factors     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-05-26     Completed Date:  1989-05-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0374660     Medline TA:  Hum Factors     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  101-15     Citation Subset:  IM; S    
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MeSH Terms
Isometric Contraction*
Muscle Contraction*
Muscles / physiology*
Weight Perception / physiology*

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