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Keywords: Lactate
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Journal Articles
J Exp Biol (2020) 223 (24): jeb235705.
Published: 24 December 2020
...Michael T. Burton; Joseph M. Santin ABSTRACT Chemoreceptors that detect O 2 and CO 2 /pH regulate ventilation. However, recent work shows that lactate ions activate arterial chemoreceptors independent of pH to stimulate breathing. Although lactate rises in the central nervous system (CNS) during...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (20): jeb229716.
Published: 14 October 2020
... to understand the role of GABA in supporting the metabolic response to anoxia. To explore this, we investigated four developmentally distinct stages of A. limnaeus embryos that vary in their anoxia tolerance. We measured GABA and lactate concentrations across development in response to anoxia and aerobic...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (20): jeb213348.
Published: 24 October 2019
... that exercise-trained fish jumped 41% farther and 48% more times before reaching exhaustion. Furthermore, exercise training resulted in the hypertrophy of red muscle fibers, and an increase in red muscle capillarity and aerobic capacity. Lactate accumulation after jumping indicates that white muscle is also...
Journal Articles
J Exp Biol (2016) 219 (19): 3126–3136.
Published: 01 October 2016
...-frequency cycles are not predicted by the recent models of Förster and Hetz (2010) and Grieshaber and Terblanche (2015) , and we suggest several potential ways to reconcile the models with our observations. During immersion, pupae accumulated lactate, which then declined to low levels over 12–48 h. Pupae...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (14): 2499–2508.
Published: 15 July 2014
... of extracellular acid–base via the removal of extracellular p CO 2 and lactate after emersion was significantly retarded by exposure to both elevated temperature and p CO 2 . If elevated environmental p CO 2 and temperature lead to slower recovery after emersion, then some predominantly subtidal species that also...
Journal Articles
J Exp Biol (2013) 216 (18): 3422–3432.
Published: 15 September 2013
... lactate efflux sixfold to sevenfold with glucose present, but did not increase 2-DG uptake or reduce lactate efflux in the presence of cytochalasin B. Increasing temperature (14 to 24°C) also did not increase 2-DG uptake, but decreasing temperature (14 to 4°C) reduced 2-DG uptake by 45%. In conclusion...
Journal Articles
J Exp Biol (2013) 216 (9): 1616–1623.
Published: 01 May 2013
... binding is, moreover, modulated by Ca 2+ ions, which increase the O 2 affinity of the Hc in the tense (T; deoxygenated) as well as the relaxed (R; oxygenated) states, and by ( l )-lactate, which modulates Hc–O 2 affinity by changing the allosteric equilibrium constant, L . Cooperativity in O 2 binding...
Includes: Supplementary data
Journal Articles
J Exp Biol (2009) 212 (21): 3428–3439.
Published: 01 November 2009
... by a small, but significant, increase in anaerobic metabolism as indicated by elevated hemolymph lactate levels ( Fig. 3 ). The significant elevation of lactate in the hemolymph was not evident until 2 h following bacterial injection. It is possible that these small lactate changes could be indirect results...
Journal Articles
J Exp Biol (2009) 212 (18): 2908–2917.
Published: 15 September 2009
... –1 , increased 1.5 m min –1 every 2 min)and endurance was measured as the total time or distance run to exhaustion. Blood samples were taken to measure glucose and lactate concentrations at rest during the photophase, during peak nightly wheel running, and immediately following the second endurance...
Journal Articles
J Exp Biol (2009) 212 (15): 2378–2385.
Published: 01 August 2009
...A. M. Petersen; T. T. Gleeson SUMMARY We investigated the effect of acute and acclimatory temperature on the relative contribution of glucose and lactate to metabolism in resting sartorius muscle of the American bullfrog ( Lithobates catesbeiana ). We examined the fate of these metabolites in vitro...
Journal Articles
J Exp Biol (2009) 212 (2): 217–224.
Published: 15 January 2009
...P. J. Ponganis; T. K. Stockard; J. U. Meir; C. L. Williams; K. V. Ponganis; R. Howard SUMMARY In order to further define O 2 store utilization during dives and understand the physiological basis of the aerobic dive limit (ADL, dive duration associated with the onset of post-dive blood lactate...
Journal Articles
J Exp Biol (2008) 211 (20): 3258–3265.
Published: 15 October 2008
...), which reflects these differences in daily movement distances, that locomotor efficiency is similar across a wide range of body mass. energetics lactate locomotion scaling The activity model presented here provides support for using body mass as a scaling parameter when comparing activity...
Journal Articles
J Exp Biol (2008) 211 (7): 1057–1062.
Published: 01 April 2008
... temperatures, varying pH values and in the absence and presence of lactate ions in order to assess the contributions of oxygenation-linked binding of protons (the Bohr effect) and lactate ions to the overall enthalpies of oxygenation (ΔH′). The hemocyanin binds maximally 0.35 lactate ions per functional...
Journal Articles
J Exp Biol (2008) 211 (7): 1075–1086.
Published: 01 April 2008
...Sergio Polakof; José L. Soengas SUMMARY The aim of this study was to obtain evidence in rainbow trout for a role of lactate in glucose homeostasis as well as in the function of glucosensing tissues. In a first set of experiments, trout were injected, either (1)intraperitoneally ( N =8) with 5 ml...
Journal Articles
J Exp Biol (2007) 210 (13): 2253–2266.
Published: 01 July 2007
... 4 days of post-diapause II development and is then lost. Metabolism during anoxia appears to be supported mainly by production of lactate, with alanine and succinate production contributing to a lesser degree. Anoxic embryos also accumulate large quantities of γ-aminobutyrate (GABA), a potential...
Includes: Supplementary data
Journal Articles
J Exp Biol (2007) 210 (10): 1786–1797.
Published: 15 May 2007
... C] l -lactic acid sodium salt in either summer (June)or winter (January) after acclimation for 2 weeks at 15°C with a 12 h:12 h L:D photoperiod. Following injection with [ 14 C]lactate, frogs were either allowed to rest for 240 min (REST), hopped for 2 min on a treadmill and immediately sacrificed...
Journal Articles
J Exp Biol (2006) 209 (9): 1651–1661.
Published: 01 May 2006
... by closed system respirometry, using water of P O 2 ranging from 145 to 40 mmHg. Correlative changes in body glycogen and lactate were examined by standard enzyme assays. Scaling patterns in the growth and degrowth stages were analysed on whole-body, log-transformed data using linear regressions...
Journal Articles
J Exp Biol (2005) 208 (16): 3169–3176.
Published: 15 August 2005
... for another 10 days were able to reconstitute some of the reserve of glycogen in heart and liver but not the glycogen reserve in brain. Patterns of accumulation of lactate in individual organs were very similar to those reported for whole animals in a companion study, and point to a high degree of reliance...
Journal Articles
J Exp Biol (2005) 208 (15): 3003–3012.
Published: 01 August 2005
... create problems for oxygen delivery in older animals? We forced developing American locust grasshoppers ( Schistocerca americana ) to jump repeatedly and examined the effect of development on power output, endurance, lactate concentration, oxygen consumption and the oxygen sensitivity of jump performance...
Journal Articles
J Exp Biol (2004) 207 (23): 4045–4056.
Published: 01 November 2004
... mass scaling of post-contractile lactate dynamics was monitored during recovery from anaerobic, burst exercise in white and dark muscle, and in hemolymph. There were no differences among size classes in lactate accumulation during exercise in either muscle. However, in white fibers from large crabs...