Abstract:
NEW FINDINGS:What is the central question of this study? What is the carotid bodies' contribution to active inspiratory and expiratory response to exercise? What is the main finding and its importance? Removal of the carotid bodies reduced the active inspiratory and expiratory responses of diaphragm and abdominal internal oblique muscles, respectively, to high-intensity, but not to low-intensity, exercise in rats. Removal of the carotid bodies increased P aC O 2 and decreased arterial pH in response to high-intensity exercise. The carotid bodies contribute to the inspiratory and expiratory adjustments to high-intensity exercise in rats. ABSTRACT:Exercise involves the interaction of several physiological processes, in which adjustments in pulmonary ventilation occur in response to increased O2 consumption, CO2 production and altered acid-base equilibrium. The peripheral chemoreceptors (carotid bodies; CBs) are sensitive to changes in the chemical composition of arterial blood, and their activation induces active inspiratory and expiratory responses. Herein, we tested the hypothesis that the CBs contribute to the active inspiratory and expiratory responses to exercise in rats. We performed electromyographic recordings of the diaphragm (DiaEMG ) and abdominal internal oblique (AbdEMG ) muscles in rats before and after bilateral removal of the CBs (CBX) during constant-load low-intensity and high-intensity progressive treadmill exercise. We also collected arterial blood samples for gaseous and pH analyses. Similar increases in DiaEMG frequency in both experimental conditions (before and after CBX) during low-intensity exercise were observed, without significant changes in the DiaEMG amplitude. During high-intensity exercise, lower responses of both DiaEMG frequency and DiaEMG amplitude were observed in rats after CBX. The AbdEMG phasic active expiratory response was not significant either before or after CBX during low-intensity exercise. However, CBX reduced the phasic active expiratory responses during high-intensity exercise. The blunted responses of inspiratory and expiratory adjustments to high-intensity exercise after CBX were associated with higher P aC O 2 levels and lower arterial pH values. Our data show that in rats the CBs do not participate in the inspiratory and expiratory responses to low-intensity exercise, but are involved in the respiratory compensation against the metabolic acidosis induced by high-intensity exercise.
journal_name
Exp Physioljournal_title
Experimental physiologyauthors
Spiller PF,da Silva CAA,Francescato HDC,Moraes DJAdoi
10.1113/EP088203subject
Has Abstractpub_date
2020-08-01 00:00:00pages
1349-1359issue
8eissn
0958-0670issn
1469-445Xjournal_volume
105pub_type
杂志文章abstract::Neuropeptides and regulatory peptide hormones control many developmental, physiological and behavioural processes in animals, including humans. The nonapeptides oxytocin and arginine vasopressin are produced and released by the pituitary gland and have actions on many organs and tissues. Receptive cells possess partic...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/expphysiol.2013.072561
更新日期:2014-01-01 00:00:00
abstract:NEW FINDINGS:What is the central question of this study? Oestradiol (E2 ) plays an important role in regulating skeletal muscle strength in females. To what extent does E2 deficiency affect recovery of strength and satellite cell number when muscle is challenged by multiple injuries? What is the main finding and its im...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/EP088827
更新日期:2020-10-01 00:00:00
abstract::We present a curve-fitting approach that permits quantitative comparisons of fatigue profiles obtained with different stimulation protocols in isolated slow-twitch soleus and fast-twitch extensor digitorum longus (EDL) muscles of mice. Profiles from our usual stimulation protocol (125 Hz for 500 ms, evoked once every ...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.2007.041285
更新日期:2008-07-01 00:00:00
abstract:NEW FINDINGS:What is the central question of this study? The central goal of this study was to elucidate the role of magnesium in the regulation of pulmonary vascular reactivity in relationship to hypoxic pulmonary hypertension. What is the main finding and its importance? We found that magnesium is essential for norma...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/EP086655
更新日期:2018-04-01 00:00:00
abstract::In anaesthetized cats, it was possible to enhance the dynamic sensitivity to stretch of jaw muscle spindle primary afferents by electrical stimulation in the midbrain. This effect was taken to be due to excitation of dynamic fusimotor neurones and was used to identify fusimotor fibres as static or dynamic in recording...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.1993.sp003667
更新日期:1993-01-01 00:00:00
abstract::Six untrained, male subjects (23 +/- 1 years old, 84 +/- 5 kg, (O(2)peak)= 3.7 +/- 0.8 l min(-1)) exercised for 60 min at 75 +/- 1%(O(2)peak) on 7 consecutive days. Muscle samples were obtained before the start of cycle exercise training and 24 h after the first and seventh exercise sessions and analysed for citrate s...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.2004.027409
更新日期:2004-09-01 00:00:00
abstract::This study was designed to investigate the putative neurophysiological effects of so-called 'H-wave therapy' (HWT), a form of electrical stimulation, upon conduction latencies in the human superficial radial nerve. Antidromic compound action potentials were recorded from the superficial radial nerve in the dominant fo...
journal_title:Experimental physiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1113/expphysiol.1996.sp003979
更新日期:1996-09-01 00:00:00
abstract::Age is a primary risk factor for cardiovascular disease, and this is an increasingly important public health concern because of an increase in the absolute number and proportion of the population at an older age in many countries. A key component of cardiovascular ageing is reduced function of the vascular endothelium...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/expphysiol.2008.043349
更新日期:2009-03-01 00:00:00
abstract::The inward transport of two purines, adenosine and hypoxanthine, at 37 degrees C by horse erythrocytes was compared. No mediated transport of adenosine was detected in horse erythrocytes, nor was saturable, high-affinity binding of the potent facilitated-diffusion inhibitor nitrobenzylthioinosine demonstrable in horse...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.1998.sp004104
更新日期:1998-03-01 00:00:00
abstract::We measured plasma levels of L-arginine, its analogue NG-monomethyl-L-arginine (L-NMMA), and related amino acids in normal subjects and uraemic patients (n = 31), before and after haemodialysis. Plasma levels of L-arginine were reduced to less than half of normal values in uraemic subjects compared with controls, and ...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.1996.sp003950
更新日期:1996-05-01 00:00:00
abstract::We compared the effect of age- and sex-related differences in haemodynamics, blood volume (BV) and left ventricular (LV) size and mass on resting muscle sympathetic nerve activity (MSNA) in healthy, normotensive adults. Twenty young men (19-47 years old) and 20 young women (21-46 years old) as well as 15 older men (62...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.2013.077248
更新日期:2014-06-01 00:00:00
abstract::The renal medulla contains more mRNA of the inducible isoform of nitric oxide synthase (iNOS) than the cortex, which may be important in preventing ischaemic injury, since blood flow and tissue oxygen tension are normally low in this region. We examined the effects of the bacterial endotoxin E. coli lipopolysaccharide...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/eph8702289
更新日期:2002-03-01 00:00:00
abstract::Ageing is associated with skeletal muscle impairment. Changes in mitochondrial homeostasis are thought to play a key role in this process. This study examined whether chronic intake of polyphenols (PPs), which are known to be modulators of oxidative stress, might prevent the age-related decline of mitochondrial functi...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.2012.067496
更新日期:2013-02-01 00:00:00
abstract:NEW FINDINGS:What is the topic of this review? This review covers recent evidence highlighting the crucial pathophysiological roles and molecular mechanisms of the bone morphogenetic protein (BMP) signalling pathway during the progression of pulmonary hypertension (PH) and discusses targeting of BMP signalling as a new...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/EP086041
更新日期:2017-09-01 00:00:00
abstract:NEW FINDINGS:What is the topic of this review? The sympathetic control of renal sodium tubular reabsorption is dependent on activation of the intrarenal renin-angiotensin system and activation of the angiotensin II type 1 (AT1 ) receptor by angiotensin II. What advances does it highlight? Despite the fact that the inte...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/EP085075
更新日期:2015-04-20 00:00:00
abstract::Electromyographic recordings (EMGs) were made from the active masseter muscle, of the inhibitory reflex evoked by application of electrical stimuli to the skin of the upper lip in fifteen human subjects. In control sequences, the reflex had a mean latency of 42 +/- 1.1 ms and a mean duration of 45 +/- 2.1 ms. The magn...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.1995.sp003849
更新日期:1995-03-01 00:00:00
abstract:NEW FINDINGS:What is the topic of this review? This review describes the role of renal nerves as the key carrier of signals from the kidneys to the CNS and vice versa; the brain and kidneys communicate through this carrier to maintain homeostasis in the body. What advances does it highlight? Whether renal or autonomic ...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/expphysiol.2014.079889
更新日期:2015-04-20 00:00:00
abstract::There are abundant animal data attempting to identify the neural circuitry involved in cardiovascular control. Translating this research into humans has been made possible using functional neurosurgery during which deep brain stimulating electrodes are implanted into various brain nuclei for the treatment of chronic p...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/expphysiol.2011.060848
更新日期:2012-01-01 00:00:00
abstract::In mammals, including man, epidemiological and experimental studies have shown that a range of environmental factors acting during critical periods of early development can alter adult phenotype. Hormones have an important role in these epigenetic modifications and can signal the type, severity and duration of the env...
journal_title:Experimental physiology
pub_type:
doi:10.1113/expphysiol.2008.046359
更新日期:2009-06-01 00:00:00
abstract::The properties of two types of calcium current (ICa(T) and ICa(L)) and their relationship with contraction were studied in isolated frog atrial trabeculae using the double mannitol gap technique. In Ringer solution containing TTX the calcium currents observed are similar to the ICa(T) and ICa(L) found in single frog a...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.1994.sp003812
更新日期:1994-09-01 00:00:00
abstract:NEW FINDINGS:What is the central question of this study? Does a previously hypothesized signalling mechanism, believed to detect postprandial increases in intestinal phosphate and that can stimulate the kidneys to rapidly excrete phosphate, operate under physiological conditions? What is the main finding and its import...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/EP086062
更新日期:2017-04-01 00:00:00
abstract::What is the topic of this review? This article presents emerging evidence for heightened carotid body chemoreflex activity as a major driver of sympathetic activation and hypertension in sleep apnoea patients. What advances does it heighlight? This article discusses the recent advances on cellular, molecular and epige...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/EP085624
更新日期:2016-08-01 00:00:00
abstract::The autonomic adjustments to exercise are mediated by central signals from the higher brain (central command) and by a peripheral reflex arising from working skeletal muscle (exercise pressor reflex), with further modulation provided by the arterial baroreflex. Although it is clear that central command, the exercise p...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1113/expphysiol.2005.032037
更新日期:2006-01-01 00:00:00
abstract::This study investigated whether sensitivity to nociceptive stimuli is altered in obese rats using established models of inflammatory pain, and using real-time PCR, profiled alterations in expression of key adipokine and inflammatory mediator mRNA (adiponectin, tumor necrosis factor-α, interleukin-1β, cyclooxygenase-2,...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.2011.064220
更新日期:2012-11-01 00:00:00
abstract::A sustained postexercise vasodilatation, which is histamine receptor mediated, has been observed following single bouts of whole-body exercise, but the mechanisms that regulate activation of histamine receptors following exercise are undefined. Exploration of vasodilatation after small muscle-mass dynamic or resistanc...
journal_title:Experimental physiology
pub_type: 杂志文章,随机对照试验
doi:10.1113/expphysiol.2012.066605
更新日期:2013-01-01 00:00:00
abstract::Flow of submandibular saliva and the constituents secreted during chorda-lingual nerve stimulation at 40 Hz (3 x 10 min) were studied after alpha- and beta-adrenergic blockade, and in the absence (control) or presence of cholinergic blockade in anaesthetized rats. Peroxidase and true tissue kallikrein (rK1) were asses...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.1996.sp003940
更新日期:1996-05-01 00:00:00
abstract::The present study examined whether an increase in leg blood flow and oxygen delivery at the onset of intense exercise would speed the rate of rise in leg oxygen uptake. Nine healthy men (25 ± 1 years old, mean ± SEM) performed one-leg knee-extensor exercise (62 ± 3 W, 86 ± 3% of incremental test peak power) for 4 min ...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/expphysiol.2014.081141
更新日期:2014-10-01 00:00:00
abstract:NEW FINDINGS:What is the central question of this study? What are the cellular and molecular determinants of increased risk for cardiovascular disease from prolonged sitting? What is the main finding and its importance? Prolonged sitting, independent of calf raise interruption strategies, decreases microparticle counts...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/EP088690
更新日期:2020-08-01 00:00:00
abstract::The present investigation was designed to examine whether calmodulin is involved in the inhibition of the ATP-sensitive K+ (K(ATP)) channel by glucagon-like peptide 1(7-36) amide (GLP-1) in mouse pancreatic beta-cells. Membrane potential, single channel and whole-cell currents through the K(ATP) channels, and intracel...
journal_title:Experimental physiology
pub_type: 杂志文章
doi:10.1113/eph8602173
更新日期:2001-05-01 00:00:00
abstract::Animal studies show that arginine vasopressin facilitates aggression, while serotonin (5-HT) inhibits aggression by blocking the activity of the vasopressin system. Clinical studies report that subjects with a history of 'fighting and assault' show a significant positive correlation between cerebrospinal fluid concent...
journal_title:Experimental physiology
pub_type: 杂志文章,评审
doi:10.1111/j.1469-445x.2000.tb00011.x
更新日期:2000-03-01 00:00:00