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Influences of span and wrist posture on peak chuck pinch strength and time needed to reach peak strength [An article from: International Journal of Industrial Ergonomics]
Book Details
Author(s)Y.-C. Shih, Y.-C. Ou
PublisherElsevier
ISBN / ASINB000RR1MF8
ISBN-13978B000RR1MF9
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from International Journal of Industrial Ergonomics, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Evaluation of pinch strength is useful in alleviating carpal tunnel syndrome (CTS), and when peak strength is reached (denoted as T"M"V"C), may be a useful and interesting index for evaluating strength generation and the relationship between resistance and response time. This paper intends to investigate the effects of pinch span and wrist posture on how much time is required to reach MVC (T"M"V"C), as well as MVC. Thirty right-handed subjects including 15 males and 15 females volunteered for this experiment. A nested-factorial design was employed with four fixed independent variables of gender, subject (nested within gender), span (2, 4, 6, and 8cm) and wrist posture (neutral, maximal extension and maximal flexion). The ANOVA results indicate that male MVC is greater than female MVC at any given span or wrist posture. On average, male MVC is 89.6N, and female MVC is 53.6N, nearly 60% that of males. For both genders and under four spans, neutral MVC is the greatest and maximal-flexion MVC is the least. Additionally, both neutral and maximal-extension MVCs increase as span increases, but maximal-flexion MVC increases up to 6cm, and then decreases at 8cm. On the other hand, only the gender effect on T"M"V"C is significant. Average male T"M"V"C is 1.828s, and it is 1.346s for females. Notably, the effects of span and wrist posture are not able to affect T"M"V"C at all, even if they affect MVC pronouncedly. Relevance to industry: Present data provide useful information about the effects of grip span and extreme wrist posture on tool/task design requiring pinch strength. The T"M"V"C possible becomes the upper limit of response time to overcome resistance in tools/tasks.
Description:
Evaluation of pinch strength is useful in alleviating carpal tunnel syndrome (CTS), and when peak strength is reached (denoted as T"M"V"C), may be a useful and interesting index for evaluating strength generation and the relationship between resistance and response time. This paper intends to investigate the effects of pinch span and wrist posture on how much time is required to reach MVC (T"M"V"C), as well as MVC. Thirty right-handed subjects including 15 males and 15 females volunteered for this experiment. A nested-factorial design was employed with four fixed independent variables of gender, subject (nested within gender), span (2, 4, 6, and 8cm) and wrist posture (neutral, maximal extension and maximal flexion). The ANOVA results indicate that male MVC is greater than female MVC at any given span or wrist posture. On average, male MVC is 89.6N, and female MVC is 53.6N, nearly 60% that of males. For both genders and under four spans, neutral MVC is the greatest and maximal-flexion MVC is the least. Additionally, both neutral and maximal-extension MVCs increase as span increases, but maximal-flexion MVC increases up to 6cm, and then decreases at 8cm. On the other hand, only the gender effect on T"M"V"C is significant. Average male T"M"V"C is 1.828s, and it is 1.346s for females. Notably, the effects of span and wrist posture are not able to affect T"M"V"C at all, even if they affect MVC pronouncedly. Relevance to industry: Present data provide useful information about the effects of grip span and extreme wrist posture on tool/task design requiring pinch strength. The T"M"V"C possible becomes the upper limit of response time to overcome resistance in tools/tasks.
