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Dynamic changes in scope for heart rate and cardiac autonomic control during warm acclimation in rainbow trout

Författare och institution:
Andreas Ekström (Institutionen för biologi och miljövetenskap); Kim Hellgren (Institutionen för biologi och miljövetenskap); A. Grans (-); Nicolas Pichaud (Institutionen för biologi och miljövetenskap); Erik Sandblom (Institutionen för biologi och miljövetenskap)
Publicerad i:
Journal of Experimental Biology, 219 ( 8 ) s. 1106-1109
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Time course studies are critical for understanding regulatory mechanisms and temporal constraints in ectothermic animals acclimating to warmer temperatures. Therefore, we investigated the dynamics of heart rate and its neuro-humoral control in rainbow trout (Onchorhynchus mykiss L.) acclimating to 16 degrees C for 39 days after being acutely warmed from 9 degrees C. Resting heart rate was 39 beats min(-1) at 9 degrees C, and increased significantly when fish were acutely warmed to 16 degrees C (Q(10)=1.9), but then declined during acclimation (Q(10)=1.2 at day 39), mainly due to increased cholinergic inhibition while the intrinsic heart rate and adrenergic tone were little affected. Maximum heart rate also increased with warming, although a partial modest decrease occurred during the acclimation period. Consequently, heart rate scope exhibited a complex pattern with an initial increase with acute warming, followed by a steep decline and then a subsequent increase, which was primarily explained by cholinergic inhibition of resting heart rate.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper
Acclimation dynamics, Cholinergic tone, Heart rate scope, Intrinsic heart rate, Maximum heart rate, Time course, acute temperature increase, oncorhynchus-mykiss, thermal-acclimation, marine teleost, blood-flow, performance, fish, tolerance
Postens nummer:
Posten skapad:
2016-05-31 11:24

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