A Comparative Study of the Temperature Coefficient Q10 in Hibernating Ground Squirrels Urocitellus undulatus and Cooled Rats of Different Ages

The temperature coefficients of heart rate ( Q10 HR ) or oxygen consumption ( Q10 Ox ) were analyzed upon arousal from natural hibernation in long-tailed ground squirrels Urocitellus undulatus and during the rewarming of artificially precooled adult rats and rat pups. The Q10 Ox value was calculated...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of evolutionary biochemistry and physiology Jg. 60; H. 4; S. 1437 - 1446
Hauptverfasser: Zakharova, N. M., Tarahovsky, Yu. S., Khrenov, M. O.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Moscow Pleiades Publishing 01.07.2024
Springer Nature B.V
Schlagworte:
Animal Physiology
Animals
Arousal
Biochemistry
Biomedical and Life Sciences
Body temperature
Carbon dioxide
Cardiac arrest
Cooling
Evolutionary Biology
Experimental Papers
Heart rate
Heat
Hibernation
Hypothermia
Hypoxia
Juveniles
Life Sciences
Medical research
Medicine
Metabolism
Oxygen consumption
Physiology
Rodents
Sensors
Temperature
Thermogenesis
Torpor
United States > US
ground squirrel
heart rate
temperature coefficient Q10
rat
oxygen consumption
rat pup
ISSN:0022-0930, 1608-3202
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The temperature coefficients of heart rate ( Q10 HR ) or oxygen consumption ( Q10 Ox ) were analyzed upon arousal from natural hibernation in long-tailed ground squirrels Urocitellus undulatus and during the rewarming of artificially precooled adult rats and rat pups. The Q10 Ox value was calculated using a standard equation, whereas for calculating Q10 HR , the equation was empirically modified to track changes in this parameter over a wide range of body temperatures ( T b ). It was found that during the initial period of arousal from torpor, at T h ≤ 10°C, ground squirrels demonstrated a sharp increase in the temperature coefficients up to Q10 HR = 40–50 and Q10 Ox = 6–7. Even higher values of Q10 HR (>100) were recorded at the onset of rewarming of rat pups, although they had a low level of Q10 Ox (1.2). Adult rats could not tolerate cooling below 16°C and demonstrated a moderate variability of both Q10 HR = 2.0–4.0 and Q10 Ox = 2.0–2.2. During the recovery of normal T b , the Q10 HR values in all animals approximated to ~2.0, as predicted by the van’t Hoff–Arrhenius rule for chemical reactions in both living and inanimate nature. We assume that high values of Q10 HR and Q10 Ox , detected in the early period of ground squirrel’s arousal from hibernation, may indicate the functioning of adaptive processes aimed at accelerating body warming. Resistance to cooling and a high Q10 HR in rat pups may suggest the rudimentary adaptability to hibernation in the juvenile period of rats as representatives of the order Rodentia, which also includes such natural hibernators as ground squirrels.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0022-0930
1608-3202
DOI:10.1134/S0022093024040148