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Average records (Fig. 7A) and mean data (Fig. 7B) show larger [Ca2+]i at onset and forces throughout contractions with Dblt stimulation, that is, effects similar to those in FDB fibres. Hence, Dblt stimulation gave larger forces even in soleus fibres that show minimal myosin light chain phosphorylation. Finally, we investigated whether Dblt-induced force enhancement is still present in unfatigued FDB fibres following a high-frequency 150 Hz conditioning tetanus, which is a stimulation paradigm used to induce force potentiation due to myosin light chain phosphorylation (Zhi et al. 2005). The conditioning tetanus significantly potentiated the force developed in the following 60 ms contraction (P http://www.selleck.cn/products/lee011.html indicates that the increased force with Dblt stimulation is independent of myosin light http://www.selleckchem.com/products/i-bet-762.html chain phosphorylation. In this study, experiments were performed at physiological temperatures and we used a stimulation pattern mimicking the in vivo motor unit activation of running mice. Our major finding is that early during fatiguing stimulation, Dblt stimulation transiently increases [Ca2+]i (?10 ms) and this is accompanied by a markedly increased force throughout the remainder of the 60 ms contractions. As fatigue develops, Dblt-induced force enhancement can be induced but the effect is greatly diminished. Nevertheless and in contrast to our initial hypothesis, the Dblt-induced increase in force production early during fatiguing stimulation does not result in a more extensive force loss in later fatigue stages. Thus, Dblts in vivo will have an overall positive effect on performance. The transiently higher [Ca2+]i at the onset of contractions with Dblt stimulation can in principle be due to increased http://www.selleckchem.com/products/epacadostat-incb024360.html SR Ca2+ release, slowed SR Ca2+ reuptake and/or decreased myoplasmic Ca2+ buffering. We studied the decline of [Ca2+]i after the end of Dblt and Con stimulations to assess any potential differences in SR Ca2+ reuptake or myoplasmic Ca2+ buffering (Westerblad & Allen, 1994). The results show virtually identical [Ca2+]i declines with Dblt and Con stimulation (see Fig. 5), which indicates no difference in SR Ca2+ reuptake or myoplasmic Ca2+ buffering. Thus, the initially higher [Ca2+]i with Dblt stimulation seem to be exclusively caused by additional SR Ca2+ release triggered by the Dblt-induced extra action potential. A mechanism that could contribute to Dblt-induced force enhancement is myosin light chain phosphorylation (Zhi et al. 2005). In the present study, we show that the increase in force with Dblt stimulations is still present in soleus fibres, which have minimal ability for myosin light chain phosphorylation (Ryder et al. 2007).