Abstract：
:We studied muscle fatigue in 19 paraplegic patients during an isometric sustained contraction. Both quadriceps (n = 38) were maximally stimulated for 126 s. We defined a nonlinear equation with four coefficients to fit the data and extract fatigue indices carrying information on the amount (asymptotic values, torque coordinate at the inflection point, total decrement from initial value) and the rate of torque decrease (maximum slope, time constant, time coordinate at the inflection point, time at which the torque reached 50% of initial value). Most of the indices reported in the literature provide information limited to the amount of torque decrease. Three of the coefficients we defined could be graphically estimated. The goodness of fit was very high (r2 = 0.993 +/- 0.001) but none of the indices provided information on both the amount and the rate of decrease. Major differences were encountered among the patients. Therefore, some of the computed indices varied to a great extent. We studied the curves exhibiting the same fatigue indices and defined a simple general fatigue index able to distinguish from muscles having different resistance to fatigue (asymptotic value x the time constant). This index is carrying both types of information and is expressed in relative torque x second (range from 1.81 to 22.82).
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Rabischong E,Chavet Pdoi
10.1016/s1350-4533(97)00038-6subject
Has Abstractpub_date
1997-12-01 00:00:00pages
749-54issue
8eissn
1350-4533issn
1873-4030pii
S1350-4533(97)00038-6journal_volume
19pub_type
杂志文章abstract：:The Cochlear Microphonic is one of the electrical potentials generated by the ear in response to audible stimuli. It is very difficult to measure the CM non-invasively because it has a very small magnitude (less than 1 μV). A high Common Mode Rejection Ratio (CMRR) and very large bandwidth (5 Hz-20 kHz) biomedical amp...
journal_title：Medical engineering & physics
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journal_title：Medical engineering & physics
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更新日期：1996-01-01 00:00:00
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更新日期：2016-12-01 00:00:00
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journal_title：Medical engineering & physics
pub_type： 杂志文章
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更新日期：2012-03-01 00:00:00
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journal_title：Medical engineering & physics
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更新日期：2010-07-01 00:00:00
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journal_title：Medical engineering & physics
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更新日期：2009-04-01 00:00:00
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更新日期：2017-03-01 00:00:00
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journal_title：Medical engineering & physics
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doi：10.1016/j.medengphy.2004.06.002
更新日期：2004-10-01 00:00:00
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更新日期：2017-02-01 00:00:00
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更新日期：2014-05-01 00:00:00
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更新日期：2010-10-01 00:00:00
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journal_title：Medical engineering & physics
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journal_title：Medical engineering & physics
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更新日期：2017-02-01 00:00:00
