Heart rate variability and critical flicker fusion frequency changes during and after parachute jumping in experienced skydivers

Cavalade, M; Papadopoulou, Virginie; Theunissen, Sigrid; Balestra, Costantino

doi:10.1007/s00421-015-3137-5

Cited by 18 publications

(7 citation statements)

References 107 publications

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“…It is also interesting to compare the stimulatory effect of submaximal training between non-experienced (like in this study) with experienced sportsmen. Cavalade et al (2015) in their study did not find a CFF lowering during and after a skydive jump among experienced skydivers, which suggested that hypoxia, which is known to induce autonomic shifts in cardiovascular regulation by the ANS, was well tolerated by the experienced skydiver and did not affect the ANS (Cavalade et al, 2015). A comparison of CFF changes after acute cycling among experienced and non-experienced volunteers could help to dissociate whether it is due to a general effect in body metabolism or rather a neurophysiological change.…”

Section: Further Investigationsmentioning

confidence: 99%

The effect of acute, moderate intensity indoor cycling on the temporal resolution of human vision system, measured by critical fusion frequency

2020

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Critical fusion frequency (CFF) reflects the basic temporal function of the visual system and therefore is a good measure of its performance. CFF has been implemented in psychological and pharmacological studies to evaluate cognitive functions. The influence of abnormal environmental conditions, such as physical exercise, has been recently explored. Previous studies have presented alterations of cognitive processes due to acute exercise. However, the duration of the effect after the end of exercise has not been investigated. This evaluation is important especially in reference to long‐term conclusions on the effect of training on CFF as an improvement of cognition. The main goal of this study was to check whether a stimulatory effect of acute submaximal physical exercise on CFF among non‐experienced cyclists persists over time. Moreover, we asked whether this effect differs between areas of visual field. CFF thresholds from 15 volunteers were measured by means of an automated medical perimeter PTS 910 (Bogdani) before, immediately after the end, and 30 min after the end of two sessions (training and rest). During rest, CFF did not change significantly, but we observed an increased CFF immediately after training. Interestingly, this increase was maintained 30 min after the end of exercise in fovea. A greater decrease of CFF during rest was observed for lower than for upper hemifield. Our results suggest that an acute, moderate‐intensity cycling improved CFF in non‐experienced cyclists, with the duration of the effect depending on eccentricity. The possible visual hemifield asymmetries of CFF changes over time will be further investigated.

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Section: Further Investigationsmentioning

confidence: 99%

The effect of acute, moderate intensity indoor cycling on the temporal resolution of human vision system, measured by critical fusion frequency

2020

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“…As previously reported, highly demanding work tasks, e.g., those carried out by paratroopers, dynamic precision shooting evaluative teams, and dynamic precision shooting non-evaluative teams, for which a high level of concentration and precision with minimum allowed margins of errors required, particularly during skydive free fall, imply significantly higher stress and SNS indices than the control group, represented by white-collar workers (office clerks). This was also corroborated, on the contrary, by decreased values of vagal function represented by RMSSD, HF power, and PNS [35][36][37].…”

Section: Discussionmentioning

confidence: 73%

HRV in Active-Duty Special Forces and Public Order Military Personnel

et al. 2021

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Heart rate variability (HRV) is a simple, non-invasive, real-time analyzable, and highly reproducible measurement that captures incidences for assessing a person’s health and physical condition. Public security jobs are characterized by major exposure to risk factors known to influence the cardiovascular response to stimuli, e.g., night shifts, highly physically demanding activity, and acute stress activity. This study aimed to evaluate the HRV parameters in a population of 112 male personnel of the special forces and public order of the Carabinieri, aged 25–59, when engaged in several duty tasks, such as paratroopers, night shift police station officers, night shift patrol, dynamic precision shooting evaluative team, dynamic precision shooting non-evaluative team, and office clerks (used as control group). During the specific task of each participant, the HRV parameters were collected with wearable devices and processed. The HRV parameters in the time and frequency domains collected were average heart rate, standard deviation of all normal RR intervals, root mean square of successive differences in adjacent normal-to-normal (NN) intervals, very-low-frequency power, low-frequency power, high-frequency power, stress index, parasympathetic nervous system activity index, and sympathetic nervous system activity index. Parametric tests for independent series to compare the HRV parameters by subgroups within the study subjects were used. A multivariate linear regression analysis was conducted to evaluate the association between the HRV parameters and some personal and organizational factors. The comparison between different subgroups showed that activities with a high demand for concentration and precision, as is the case with paratroopers and dynamic precision shooters, differ significantly from activities that can be defined as routine, such as office work. Other activities, such as patrolling or remote management from operations centers, although including critical elements, did not deviate significantly from the control group. The study of HRV parameters is therefore a useful tool for occupational physicians, both for addressing work suitability assessments and for better targeting health promotion campaigns, to be considered as being aimed at monitoring the subject’s physiological parameters, and not at the diagnosis of any pathological condition, which should always be carried out by the medical specialist.

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“…During scuba diving, a decrease in breathing frequency ( Schipke and Pelzer, 2001 ), may shift the respiratory peak from the usual high-frequency band (HF) to the usual low-frequency band (LF; Brown et al, 1993 ). Therefore, to avoid the influence of respiratory sinus arrhythmia ( Cavalade et al, 2015 ), we adapted the limits of frequency analysis: total spectral power ( P tot : 0–0.4 Hz), high frequency (HF: 0.1–0.4 Hz), and low frequency (LF: 0–0.1). Power spectral density of HRV ( Niskanen et al, 2004 ) was calculated according to these limits.…”

Section: Methodsmentioning

confidence: 99%

Heart Rate Variability During a Standard Dive: A Role for Inspired Oxygen Pressure?

et al. 2021

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Introduction: Heart rate variability (HRV) during underwater diving has been infrequently investigated because of environment limitations and technical challenges. This study aims to analyze HRV changes while diving at variable hyperoxia when using open circuit (OC) air diving apparatus or at constant hyperoxia using a closed-circuit rebreather (CCR). We used HRV analysis in time and frequency domain adding nonlinear analysis which is more adapted to short-time analysis and less dependent on respiratory rate (Sinus respiratory arrhythmia).Materials and Methods: 18 males, 12 using OC (30 mfw for 20 min) and 6 using CCR (30 mfw for 40 min.). HRV was recorded using a polar recorder. Four samples of R-R intervals representing the dive were saved for HRV analysis. Standard deviation of normal-to-normal intervals (SDNN), square root of the mean squared differences between successive RR intervals (rMSSD), and average RR intervals (RR) in time-domain; low frequency (LF) and high frequency (HF) in frequency domain were investigated. Nonlinear analysis included fractal dimension (FrD).Results: SDNN and rMSSD were significantly increased during descent and at depth with OC, not with CCR. Mean RR interval was longer at depth with OC, but only during ascent and after the dive with CCR. HF power was higher than baseline during the descent both with OC and CCR and remained elevated at depth for OC. The LF/HF ratio was significantly lower than baseline for descent and at depth with both OC and CCR. After 30 min of recovery, the LF/HF ratio was higher than baseline with both OC and CCR. Nonlinear analysis detected differences at depth for OC and CCR.Discussion: Increased parasympathetic tone was present during diving. RR duration, SDNN; rMSSD, HF spectral power all increased during the dive above pre-dive levels. Conversely, HF power decreased (and the LF/HF increased) 30 min after the dive. Using FrD, a difference was detected between OC and CCR, which may be related to differences in partial pressure of oxygen breathed during the dive.

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Heart rate variability and critical flicker fusion frequency changes during and after parachute jumping in experienced skydivers

Cited by 18 publications

References 107 publications

The effect of acute, moderate intensity indoor cycling on the temporal resolution of human vision system, measured by critical fusion frequency

The effect of acute, moderate intensity indoor cycling on the temporal resolution of human vision system, measured by critical fusion frequency

HRV in Active-Duty Special Forces and Public Order Military Personnel

Heart Rate Variability During a Standard Dive: A Role for Inspired Oxygen Pressure?

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