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Keywords: aerobic capacity
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Journal Articles
J Exp Biol (2022) 225 (21): jeb244576.
Published: 31 October 2022
... commonly assess endurance by measuring a different trait, variously termed exertion or distance capacity, that is arguably not a function of aerobic capacity. Unlike treadmill endurance where the organism is forced to conform to the speed of the belt on which it runs, exertion is typically measured...
Journal Articles
J Exp Biol (2021) 224 (21): jeb243082.
Published: 9 November 2021
... for its hypoxia tolerance associated with metabolic rate depression, yet the mechanisms that sustain mitochondrial function during oxygen fluctuations are not well understood. We used top-down metabolic control analysis (MCA) to determine aerobic capacity and control over oxygen flux in the mitochondria...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (24): jeb229013.
Published: 23 December 2020
... species of lizards, helodermatids, varanids and skinks (which are mainly active foragers) have relatively high maximal aerobic capacity during forced exercise ( V̇ O 2 ,max V̇ O 2 ,max ), whereas viviparous species have relatively low V̇ O 2 ,max V̇ O 2 ,max . Aerobic capacity Allometry...
Journal Articles
J Exp Biol (2018) 221 (22): jeb191056.
Published: 14 November 2018
...Kang Nian Yap; Morag F. Dick; Christopher G. Guglielmo; Tony D. Williams ABSTRACT Despite widely held assumptions that hematocrit (Hct) is a key determinant of aerobic capacity and exercise performance, this relationship has not often been tested rigorously in birds and results to date are mixed...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (4): jeb172643.
Published: 14 February 2018
... of multiple stressors (such as salinity stress and wave action) on bioenergetics and burrowing performance of marine bioturbators are not well understood. We investigated the effects of mechanical disturbance and salinity stress on the burrowing behavior, aerobic capacity and energy expense of digging...
Journal Articles
J Exp Biol (2016) 219 (4): 470–473.
Published: 15 February 2016
... characteristics remain unaffected. Myodes glareolus Aerobic capacity Artificial selection Fibre types Gastrocnemius Locomotor performance The maximum rate of aerobic exercise metabolism is a trait of special interest from both medical and evolutionary–comparative perspectives, because...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (18): 3193–3196.
Published: 15 September 2014
...Marie-Pierre Schippers; Christophe M. R. LeMoine; Grant B. McClelland Fuel selection patterns during exercise are thought to be conserved among sea-level native mammals when intensity is expressed relative to maximum aerobic capacity ( ). However, this claim is based on data from only a few species...
Journal Articles
J Exp Biol (2014) 217 (10): 1642–1648.
Published: 15 May 2014
... if its availability were tied to the availability of particular food sources. The advantages that have led to the evolution of an endothermic physiology are still under debate. A widely accepted model is that directional selection for incremental increases in aerobic capacity and sustained...
Journal Articles
J Exp Biol (2012) 215 (18): 3223–3230.
Published: 15 September 2012
...Koa N. Webster; Terence J. Dawson SUMMARY We examined the structure–function relationships that underlie the aerobic capacities of marsupial mammals that hop. Marsupials have relatively low basal metabolic rates (BMR) and historically were seen as ‘low energy’ mammals. However, the red kangaroo...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (18): 3207–3217.
Published: 15 September 2012
... as fixed effects. Significant main effects of treatment were analyzed using least significant difference (LSD) pairwise comparisons. * Author for correspondence ( kschmi5@uwo.ca ) 2 12 2011 28 5 2012 © 2012. 2012 aerobic capacity basal metabolic rate bird glucocorticoid...
Journal Articles
J Exp Biol (2011) 214 (19): 3186–3196.
Published: 1 October 2011
...Mark A. Chappell; Jean-Francois Savard; Jennifer Siani; Seth W. Coleman; Jason Keagy; Gerald Borgia SUMMARY Individual variation in aerobic capacity has been extensively studied, especially with respect to condition, maturity or pathogen infection, and to gain insights into mechanistic foundations...
Journal Articles
J Exp Biol (2009) 212 (17): 2872–2878.
Published: 1 September 2009
...Andrzej K. Gębczyński; Marek Konarzewski SUMMARY According to the aerobic capacity model of the evolution of endothermy,high levels of basal/resting metabolic rate (BMR/RMR) underlying endothermy have evolved as a correlated response to selection for high rates of aerobic metabolism ( V O 2 max...
Journal Articles
J Exp Biol (2009) 212 (5): 610–619.
Published: 1 March 2009
... differences in altitude do not necessarily result in differences in aerobic capacity in small mammals and, even if V̇ O 2 ,max is reduced at high altitude, there may be no effect on voluntary running behavior. Least chipmunks differed in V̇ O 2 ,max between SNARL and Barcroft ( P <0.0001)( Table 2...
Journal Articles
J Exp Biol (2005) 208 (9): 1635–1644.
Published: 1 May 2005
... on the mechanistic explanation of the scaling exponents observed for MMR as elicited by exercise? Two observations stand out. metabolic rate scaling locomotor muscle aerobic capacity mitochondria capillary fractal design vascular supply network energy demand Maximal metabolic rate (MMR...
Journal Articles
J Exp Biol (2004) 207 (22): 3839–3854.
Published: 15 October 2004
... a fitness advantage by permitting a greater range of speeds to be supported aerobically at low T a . Our findings were not consistent with the hypothesis that voluntary running speeds are tightly constrained by aerobic capacity (although such a constraint might be evident at sub-zero temperatures...
Journal Articles
J Exp Biol (2004) 207 (16): 2811–2821.
Published: 15 July 2004
... in the past the marsupials were considered to be metabolically `primitive', the red kangaroo Macropus rufus has been reported to have an aerobic capacity ( V̇ O 2 max )comparable to that of the most `athletic' of placentals such as dogs. However,kangaroos travel at moderate speeds with lower relative cost...
Journal Articles
J Exp Biol (2003) 206 (20): 3707–3718.
Published: 15 October 2003
...Jason P. Odell; Mark A. Chappell; Kathryn A. Dickson SUMMARY We examined the mechanistic basis for two whole-animal performance traits,aerobic capacity and burst speed, in six laboratory-reared Trinidadian guppy populations from different native drainages with contrasting levels of predation. Using...
Journal Articles
J Exp Biol (2003) 206 (16): 2845–2857.
Published: 15 August 2003
... other actively swimming shark species. The metabolic enzymes measured were citrate synthase(CS), an index of aerobic capacity, and lactate dehydrogenase (LDH), an index of anaerobic capacity. WM creatine phosphokinase (CPK) activity, an index of rapid ATP production during burst swimming, was also...
Journal Articles
J Exp Biol (2003) 206 (16): 2831–2843.
Published: 15 August 2003
... aerobic capacity appears to be less than that of tuna RM. Although we found the RM position of the two lamnids and the common thresher shark to be generally similar to that of tunas, there are noteworthy specific differences among the sharks ( Fig. 1 ). In makos, RM ends at the caudal peduncle...
Journal Articles
J Exp Biol (2003) 206 (7): 1221–1231.
Published: 1 April 2003
... rates (Hayes, 1989a , b )suggest that at typical nighttime temperatures at our White Mountains field site (approximately 0-5°C in summer and -5°C to -20°C in winter),deer mice are operating close to their maximal aerobic capacity. Therefore,the age-related decline we found in V̇ O 2 sum would...