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• W2550242589 endingPage "e13043" @default.
• W2550242589 startingPage "e13043" @default.
• W2550242589 abstract "We test the hypothesis that cytosolic inorganic phosphate (Pi) can account for the contraction-induced reductions in twitch duration which impair summation and cause force to decline (sag) during unfused tetanic contractions of fast-twitch muscle. A five-state model of crossbridge cycling was used to simulate twitch and unfused tetanic contractions. As Pi concentration ([Pi]) was increased from 0 to 30 mmol·L−1, twitch duration decreased, with progressive reductions in sensitivity to Pi as [Pi] was increased. When unfused tetani were simulated with rising [Pi], sag was most pronounced when initial [Pi] was low, and when the magnitude of [Pi] increase was large. Fast-twitch extensor digitorum longus (EDL) muscles (sag-prone, typically low basal [Pi]) and slow-twitch soleus muscles (sag-resistant, typically high basal [Pi]) were isolated from 14 female C57BL/6 mice. Muscles were sequentially incubated in solutions containing either glucose or pyruvate to create typical and low Pi environments, respectively. Twitch duration was greater (P < 0.05) in pyruvate than glucose in both muscles. Stimuli applied at intervals approximately three times the time to peak twitch tension resulted in sag of 35.0 ± 3.7% in glucose and 50.5 ± 1.4% in pyruvate in the EDL (pyruvate > glucose; P < 0.05), and 3.9 ± 0.3% in glucose and 37.8 ± 2.7% in pyruvate in the soleus (pyruvate > glucose; P < 0.05). The influence of Pi on crossbridge cycling provides a tenable mechanism for sag. Moreover, the low basal [Pi] in fast-twitch relative to slow-twitch muscle has promise as an explanation for the fiber-type dependency of sag." @default.
• W2550242589 created "2016-11-30" @default.
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• W2550242589 date "2016-11-01" @default.
• W2550242589 modified "2023-10-15" @default.
• W2550242589 title "Can inorganic phosphate explain sag during unfused tetanic contractions of skeletal muscle?" @default.
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• W2550242589 doi "https://doi.org/10.14814/phy2.13043" @default.
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