801 resultados para compassion fatigue


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"Materials Central, Contract No. AF 33(038)-22609, Project No. 7360."

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"Project no. 7360."

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At head of title: Home office.

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"July 1997."

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Mode of access: Internet.

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Apparatus for nerve muscle experiment. The machine on the right gives shocks at the desired frequency (source: Physiology at Michigan, 1850-1923 by Horace W. Davenport)

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"August 1928."

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Thesis (Ph.D.)--University of Washington, 2016-06

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Thesis (Ph.D.)--University of Washington, 2016-06

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An important functional and evolutionary constraint on the physical performance of vertebrates is believed to be the trade-off between speed and endurance capacity. However, despite the pervasiveness of physiological arguments, most studies have found no evidence of the trade-off when tested at the whole-animal level. We investigated the existence of this trade-off at the whole-muscle level, the presumed site of this physiological conflict, by examining inter-individual variation in both maximum power output and fatigue resistance for mouse extensor digitorum longus (EDL) muscle using the work-loop technique. We found negative correlations between several measures of in vitro maximum power output and force production with fatigue resistance for individual mouse EDL muscles, indicating functional trade-offs between these performance parameters. We suggest that this trade-off detected at the whole-muscle level has imposed an important constraint on the evolution of vertebrate physical performance.