TY - JOUR
T1 - Cold exposure increases running V̇o2 max and cost of transport in goats
AU - Schaeffer, P. J.
AU - Hokanson, J. F.
AU - Wells, D. J.
AU - Lindstedt, S. L.
PY - 2001/1
Y1 - 2001/1
N2 - We inadvertently subjected a group of goats to 5 mo of cold exposure (mean minimum temperature less than -13°C) during an experiment designed to examine the effects of training by daily running on one member of each sibling pair. During the three coldest months, the sedentary but cold-exposed goats experienced a 34% increase in maximal oxygen uptake (Vo2 max, P < 0.01) and a 29% increase in running speed at maximal (P < 0.05). When temperatures increased in the spring, both oxygen uptake and running speed decreased. We interpret these findings as evidence that cold is a sufficient stimulus to invoke the development of aerobic structures in muscle and that these structures subsequently can be utilized for the novel task of running. When the experiment was subsequently repeated without the cold exposure, running speed and Vo2 max of trained animals increased less than in either group of cold-exposed animals. However, the cost of transport of these warm runners was lower than either group of cold-exposed animals (from 13-19%, P < 0.0001). Thus, although aerobic capacity was increased with acclimation to severe winter weather, cold-acclimated goats operated with lower efficiency during locomotion.
AB - We inadvertently subjected a group of goats to 5 mo of cold exposure (mean minimum temperature less than -13°C) during an experiment designed to examine the effects of training by daily running on one member of each sibling pair. During the three coldest months, the sedentary but cold-exposed goats experienced a 34% increase in maximal oxygen uptake (Vo2 max, P < 0.01) and a 29% increase in running speed at maximal (P < 0.05). When temperatures increased in the spring, both oxygen uptake and running speed decreased. We interpret these findings as evidence that cold is a sufficient stimulus to invoke the development of aerobic structures in muscle and that these structures subsequently can be utilized for the novel task of running. When the experiment was subsequently repeated without the cold exposure, running speed and Vo2 max of trained animals increased less than in either group of cold-exposed animals. However, the cost of transport of these warm runners was lower than either group of cold-exposed animals (from 13-19%, P < 0.0001). Thus, although aerobic capacity was increased with acclimation to severe winter weather, cold-acclimated goats operated with lower efficiency during locomotion.
KW - Cross-adaptation
KW - Muscle adaptability
KW - Nonshivering thermogenesis
KW - Shivering thermogenesis
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U2 - 10.1152/ajpregu.2001.280.1.r42
DO - 10.1152/ajpregu.2001.280.1.r42
M3 - Article
C2 - 11124132
AN - SCOPUS:0035017064
SN - 0363-6119
VL - 280
SP - R42-R47
JO - American Journal of Physiology - Regulatory Integrative and Comparative Physiology
JF - American Journal of Physiology - Regulatory Integrative and Comparative Physiology
IS - 1 49-1
ER -