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Keywords: heart rate variability
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Journal Articles
J Exp Biol (2020) 223 (5): jeb211250.
Published: 11 March 2020
... consumption rate, blood O 2 saturation, haematocrit (Hct) and blood haemoglobin (Hb) concentration. We calculated O 2 pulse (the product of stroke volume and the arterial–venous O 2 content difference), blood O 2 concentration and heart rate variability. Regardless of altitude, all eight populations...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (20): jeb204883.
Published: 23 October 2019
...) or chronic variable stress (CVS) on baroreflex, chemoreflex and heart rate variability in a protocol of 14 days of stress sessions. Exposure to RRS and CVS indicated no changes in the basal level of either arterial pressure or heart rate. However, RRS and CVS were able to attenuate sympathovagal modulation...
Journal Articles
J Exp Biol (2018) 221 (17): jeb183830.
Published: 13 September 2018
... in the elasmobranch S qualus suckleyi . Hypoxia and hyperoxia had little effect on heart rate but did alter breathing frequency and amplitude. Atropine yielded an overall tachycardia in all oxygen conditions and abolished all heart rate variability (HRV), suggesting that HRV solely reflects fluctuating vagal tonus...
Journal Articles
J Exp Biol (2016) 219 (9): 1283–1286.
Published: 01 May 2016
... <0.001) but unchanged with acclimation. Autonomic blockade showed initial responses were mainly of vagal origin, with little subsequent withdrawal or recovery in long-term heart rate variability after 6 weeks. Given the limited cardiorespiratory capacity to withstand sustained warming, effective...
Journal Articles
J Exp Biol (2014) 217 (5): 690–703.
Published: 01 March 2014
... efferent fibres in the vagus nerve, is also responsible for beat-to-beat changes in heart rate such as the high frequency components observed in spectral analysis of heart rate variability. These include respiratory modulation of the heartbeat that can generate cardiorespiratory synchrony in fish...
Journal Articles
J Exp Biol (2011) 214 (18): 3021–3031.
Published: 15 September 2011
... –1 acetoacetyl CoA (sodium salt). Heart rate variability (HRV) was analysed with HRV extension software (AD Instruments) using 512 consecutive beats (R waves), a Hann window to remove any noise interference to the power spectrum and a 2/3 overlap to minimise spectral leakage due to any...
Includes: Supplementary data
Journal Articles
J Exp Biol (2007) 210 (23): 4224–4232.
Published: 01 December 2007
... kPa) the jeju increased the frequency of air breathing ( f AB ) tenfold and maintained M tO 2 unchanged from normoxia. This was associated with a significant increase in heart rate variability (HRV),each air breath (AB) being preceded by a brief bradycardia and then followed by a brief tachycardia...
Journal Articles
J Exp Biol (2007) 210 (14): 2472–2480.
Published: 15 July 2007
...) mathematics to examine the rate association under varying levels of oxygen consumption( Ṁ O 2 ). At low Ṁ O 2 (0.94 mmol O 2 kg –1 h –1 ) there was a correspondingly low f H and f V (25.5±2.4 min –1 and 29.2±2.6 min –1 , respectively). Heart rate variability (HRV) consisted of oscillatory components caused...
Journal Articles
J Exp Biol (2006) 209 (6): 1093–1100.
Published: 15 March 2006
... analyzed short-term heart rate variability (HRV). The frequency band width of heart rate variability revealed that HRV increased between 4 d.p.f. and 15 d.p.f. From 13 to 15 d.p.f. atropine reduced the frequency band width of HRV, whereas the combination of atropine and propranolol effectively reduced...
Journal Articles
J Exp Biol (2004) 207 (11): 1969–1976.
Published: 01 May 2004
...H. A. Campbell; E. W. Taylor; S. Egginton SUMMARY Anaesthesia and minor surgery to place electrocardiogram recording electrodes in the short-horned sculpin caused a decrease in mean normal beat(R–R) interval and heart rate variability (HRV), measured as the standard deviation in the R–R interval...