. The Canadian field-naturalist. Natural history. 432 The Canadian Field-Naturalist Vol. 117 in July. After four days of re-feeding, the body weight increased to 93% of its initial level in January and to 89% in July. Post-absorptive metabolic rate during running in- creased linearly with increasing speed. In July the metabolic rate while running almost fitted general equations predicted for mammals (Taylor et al. 1982; equation 2) relating metabolic rate at a constant speed to speed and body weight, while it was up to 20% lower in January (equations 3 and 4). [2] Metabolic rate = BW&quo
. The Canadian field-naturalist. Natural history. 432 The Canadian Field-Naturalist Vol. 117 in July. After four days of re-feeding, the body weight increased to 93% of its initial level in January and to 89% in July. Post-absorptive metabolic rate during running in- creased linearly with increasing speed. In July the metabolic rate while running almost fitted general equations predicted for mammals (Taylor et al. 1982; equation 2) relating metabolic rate at a constant speed to speed and body weight, while it was up to 20% lower in January (equations 3 and 4). [2] Metabolic rate = BW"0316 ⢠v + ⢠BW"0303, where metabolic rate is W ⢠kg1, BW is body weight in kg, and v is speed inm-s1. The calculated metabolic rate during running gave the following formula for the fox when it weighed kg in January: [3] Metabolic rate = ⢠v + , and for the fox when it weighed kg in July: [4] Metabolic rate = ⢠v + The post-absorptive metabolic rate while running was up to 14% lower in January compared to July (equations 5 and 6, Figure 1). [5] Mmn in January = ⢠v + (n = 9; r2 = ) [6] Mmn in July = ⢠v + (n = 20; r2 = ), where Mmn is metabolic rate during running in W ⢠kg"1 and v is speed in m ⢠s"1. , ^ OX) -* ⢠*2 a £ v C8 tt u o « - s n=6 n=6 n=8. BMR Running Speed (m ⢠s'1) Figure 1. Post-absorptive basal metabolic rate (BMR; W ⢠kg1) and metabolic rate in one Arctic Fox running on a treadmill at three different speeds in January (solid squares) and in July (open squares) (n = the number of experiments). The equations describing the relation- ships between metabolic rate and running speeds are: Metabolic rate in January = â v + (n = 9; r = ); Metabolic rate in July = ⢠v + (n = 20;r = ). 210- n=8 n=6 n=6 195- 180- 165- 150- 135- 120- 105n rest 90 "- s: 75- ^-rV/â^- â
Size: 2777px × 900px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
