Abstract:
:As the heart transitions from one exercise intensity to another, changes in cardiac output occur, which are modulated by alterations in force development and calcium handling. Although the steady-state force-calcium relationship at various heart rates is well investigated, regulation of these processes during transitions in heart rate is poorly understood. In isolated right ventricular muscle preparations from the rabbit, we investigated the beat-to-beat alterations in force and calcium during the transition from one stimulation frequency to another, using contractile assessments and confocal microscopy. We show that a change in steady-state conditions occurs in multiple phases: a rapid phase, which is characterized by a fast change in force production mirrored by a change in calcium transient amplitude, and a slow phase, which follows the rapid phase and occurs as the muscle proceeds to stabilize at the new frequency. This second/late phase is characterized by a quantitative dissociation between the calcium transient amplitude and developed force. Twitch timing kinetics, such as time to peak tension and 50% relaxation rate, reached steady-state well before force development and calcium transient amplitude. The dynamic relationship between force and calcium upon a switch in stimulation frequency unveils the dynamic involvement of myofilament-based properties in frequency-dependent activation.
journal_name
Biomed Res Intjournal_title
BioMed research internationalauthors
Haizlip KM,Milani-Nejad N,Brunello L,Varian KD,Slabaugh JL,Walton SD,Gyorke S,Davis JP,Biesiadecki BJ,Janssen PMdoi
10.1155/2015/468548subject
Has Abstractpub_date
2015-01-01 00:00:00pages
468548eissn
2314-6133issn
2314-6141journal_volume
2015pub_type
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