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Slowing of relaxation of (Ca-2+) -i during prolonged tetanic stimulation of single fibres from Xenopus skeletal muscle

Westerblad, H.; Allen, D., G.

Journal of Physiology (Cambridge) 492(3): 723-736

1996

ISSN/ISBN: 0022-3751
Accession: 009425934
Parvalbumin (PA) has been proposed to take up Ca-2+ and enhance skeletal muscle relaxation in brief contractions; as the duration of the contraction is increased, PA will become saturated with Ca-2+ and no longer contribute to relaxation which therefore will be slowed. The rate of Ca-2+ loading of PA is determined by the Mg-2+ off rate (about 4 s-1 at 22 degree C).

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Related References

Westerblad, H.; Allen, D.G. 1996: Slowing of relaxation and (Ca2+)i during prolonged tetanic stimulation of single fibres from Xenopus skeletal muscle The Journal of Physiology 492: 3-36
Westerblad, H.; Allen, D.G. 1996: Slowing of relaxation and [Ca2+]i during prolonged tetanic stimulation of single fibres from Xenopus skeletal muscle Journal of Physiology 492: 723-736
Westerblad, H.; Allen, D., G. 1994: Relaxation, (Ca-2+)-i and (Mg-2+)-i during prolonged tetanic stimulation of intact, single fibres from mouse skeletal muscle Journal of Physiology (Cambridge) 480(1): 31-43
Westerblad, H.; Allen, D.G. 1994: Relaxation, [Ca2+]i and [Mg2+]i during prolonged tetanic stimulation of intact, single fibres from mouse skeletal muscle Journal of Physiology 480: 31-43
Westerblad, H.; Allen, D.G. 1993: The contribution of [Ca2+]i to the slowing of relaxation in fatigued single fibres from mouse skeletal muscle Journal of Physiology 468: 729-740
Westerblad, H.; Allen, D.G. 1993: The contribution of (Ca2+)i to the slowing of relaxation in fatigued single fibres from mouse skeletal muscle The Journal of Physiology 468: 9-40
Westerblad, H.; Lännergren, J. 1986: Force and membrane potential during and after fatiguing, intermittent tetanic stimulation of single Xenopus muscle fibres Acta Physiologica Scandinavica 128(3): 369-378
Westerbald, H.; Allen, D.G. 1993: The contribution of intracellular calcium concentration to the slowing of relaxation in fatigued single fibres from mouse skeletal muscle Journal of Physiology (Cambridge) 468: 729-740
Mak, V.H.; Chapman, F.; James, C.; Spiro, S.G. 1991: Sternomastoid muscle twitch maximum relaxation rate: prolonged slowing with fatigue and post-tetanic acceleration Clinical Science 81(5): 669-676
Mak, V.H.F.; Chapman, F.; James, C.; Spiro, S.G. 1991: Sternomastoid muscle twitch maximum relaxation rate : prolonged slowing with fatigue and post-tetanic acceleration Clinical Science (1979) 81(5): 669-676
Westerblad, H.; Lännergren, J. 1990: Decreased Ca2-buffering contributes to slowing of relaxation in fatigued Xenopus muscle fibres Acta Physiologica Scandinavica 139(1): 243-244
Westerblad, H.; Lännergren, J. 1994: Changes of the force-velocity relation, isometric tension and relaxation rate during fatigue in intact, single fibres of Xenopus skeletal muscle Journal of Muscle Research and Cell Motility 15(3): 287-298
Westerblad, H.; Lannergren, J.; Allen, D.G. 1995: Slowing of relaxation in fatigued skeletal muscle fibers of Xenopus Biophysical Journal 68(2 Part 2): A73
Lee, J.A.; Westerblad, H.; Allen, D.G. 1991: Changes in tetanic and resting (Ca2+)i during fatigue and recovery of single muscle fibres from Xenopus laevis The Journal of Physiology 433: 7-26
Lee, J.A.; Westerblad, H.; Allen, D.G. 1991: Changes in tetanic and resting [Ca2+]i during fatigue and recovery of single muscle fibres from Xenopus laevis Journal of Physiology 433: 307-326