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Analysis of force parameters used to assess the fatigability of mammalian motor units.Gordon, Debra Anne. January 1988 (has links)
The investigation of motor-unit fatigability in reduced-animal models has been dominated by a single fatigue test, one fatigue index, and an emphasis on changes in the magnitude of (usually peak) force. Although the standard fatigue test has been reported to elicit changes in the dynamic phases of an isometric tetanus, this has not been systematically studied in single motor units. Furthermore, changes in the profile of individual tetani during the fatigue test have led some investigators to suggest that other force parameters (i.e., integrated force) or fatigue indices may provide additional information about motor-unit performance during the test. The purposes of this project were to: (1) evaluate the time courses of a variety of force parameters characterizing both the magnitude of force and the dynamic aspects of force during a 4-min fatigue test of functionally isolated cat, tibialis posterior motor units; and (2) determine if motor units could be classified into the conventional motor-unit types based on these new parameters. There was considerable variability in the average time course of the magnitude of force during the fatigue test. The variability within the type FR and F(int) motor-unit groups resulted in several units whose characteristics bordered those which, by definition, separate unit types. The classification of these units depended on the force parameter and fatigue index used to quantify their fatigability. The time course of the magnitude of force also revealed differences in the behavior of potentiating and non-potentiating groups. There were many differences between motor-unit types in terms of dynamic-force parameters before, during and after the fatigue test. Comparison of initial and 2-min values revealed a preferential effect of stimulation on force development in type S and FR units (i.e., increased rate) and on force decay in type F(int) and FF units (i.e., prolonged duration and decreased rate). The time courses of these effects further revealed qualitative differences between different combinations of motor-unit types. Groups of units (or lack thereof) revealed by dynamic-force parameters were compared to conventional motor-unit types by discriminant analysis. The results were not always consistent with conventional types.
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Resistance to shell breaking in two intertidal snailsAsh, V. B. January 1987 (has links)
No description available.
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Bargaining over surplus : Oligopolies, workers and the £Tdistribution of income£TDowrick, S. January 1986 (has links)
No description available.
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Diametral-compression of silicon nitrideOvri, J. E. O. January 1986 (has links)
No description available.
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The influence of faults on the engineering behavior of rock massesKaaki, Ahmad Abdullah January 1990 (has links)
No description available.
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Early age strength and creep of slag cement concretesAl-Kaisi, Ali Farhan January 1989 (has links)
No description available.
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The fracture behaviour of oriented polyethyleneHallam, M. A. January 1987 (has links)
No description available.
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Failure mechanisms under complex loading of glass-reinforced polyester composites and their matrices : The effect of superposed hydrostatic pressures up to 300 MPa on axial tensile and compressive strengths, and in-plane shear properties of unidirectionalSigley, R. H. January 1988 (has links)
No description available.
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Characterisation and design of fire-resistant steels for constructionKelly, Fergal S. January 1998 (has links)
No description available.
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Characterisation & compaction of polyethylene glycolsLarhrib, El Hassane January 1997 (has links)
No description available.
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