ECG response of the human body subjected to vibrations

Al‐Nashash, Hasan; Qassem, W.; Zabin, A; Othman, M.O.

doi:10.3109/03091909609032524

Cited by 11 publications

(6 citation statements)

References 25 publications

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“…We believe that the increased amplitude in the R-wave may be due to cardiac muscle fatigue. This is due to the fatigue caused by vibrations as has been reported by the authors [26]. It is well known that …”

Section: W Qasem Et Af Effects Of Vibrations On the Ecgmentioning

confidence: 80%

“…The seat consists of a permanent magnet exciter driven by a standard function generator. In all experiments, the vibration frequency was chosen to be at 8 Hz as our earlier findings found that this frequency represents the resonant frequency of the heart [26]. To investigate the effect of the vibration force, two amplitudes were chosen, 3 and 5 mm (peak to peak).…”

Section: Experimental Systemmentioning

confidence: 99%

“…It consists of a vibrating seat, function generator, an ECG amplifier, an analogue to digital converter and a personal computer. The above system is described in detail in [26]. After the human subject was seated in the erect posture for 15 min, he was exposed to vertical vibrations coming from the vibrating seat.…”

Section: Experimental Systemmentioning

confidence: 99%

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Effect of vibrations with two different amplitudes on the ECG

Qassem

Al‐Nashash

Othman

1997

Journal of Medical Engineering & Technology

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The ECG response of a human body exposed to vertical vibrations was investigated. The per cent normalized difference (PND) between the R-wave amplitude before and after vibrations was monitored. Results obtained from a representative subject show an oscillatory decay of the PND behaviour with time. This behaviour can be modelled as a linear second order damped system. The natural frequency, damping ratio and the recovery time of the cardiac system can be measured.

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Section: W Qasem Et Af Effects Of Vibrations On the Ecgmentioning

confidence: 80%

Section: Experimental Systemmentioning

confidence: 99%

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Effect of vibrations with two different amplitudes on the ECG

Qassem

Al‐Nashash

Othman

1997

Journal of Medical Engineering & Technology

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“…The authors noted a significant effect of body position (supine vs side lying) related to the 2 parameters tested for the primary hypothesis; however, neither contact area nor pressure ratio indicated a significant effect due to HOB angle: 46 Figure 2]). The authors note that the apparently large deviations are due to the high variability between subjects; however, by including subject ID as a cofactor in the analysis, these intersubject differences are accounted for, and the hypothesis test reflects only those effects due to change in position or angle.…”

Section: Primary Objective Measuresmentioning

confidence: 93%

Proxy Study on Minimizing Risk of Sacral Pressure Ulcers While Complying with Ventilator-Associated Pneumonia Risk Reduction Guidelines

Crane

Wininger

Kunsman

2015

Advances in Skin &Amp; Wound Care

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Bed positioning poses a subtle, yet important, tradeoff in the competing needs of hospitalized patients, particularly those susceptible to lower respiratory tract infections and/or pressure ulcers. Although it is widely held that a minimum 30° incline is necessary to mitigate risk of ventilator-acquired pneumonia, it is unclear what effect semirecumbent positioning has on the risk of pressure ulcerations. The authors test several hypotheses with the objective of elucidating the relationship between bed incline, posture, and incline, pursuant to a more evidence-based recommendation for practice in clinical care. To this end, interfacial pressures from 40 healthy subjects were analyzed following observation in both supine and sidelying positions, at shallow (30°) and moderate (45°) bed-angle incline. Summarily, the authors report that supine postures reduce pressure signatures associated with pressure ulceration versus sidelying position: 15% increase area of contact (P = 1.3×10), and 17% decrease in ratio of peak to average pressure (P = 3.1×10). Within supine posture, the authors found significant increases in 4 measures of local pressure, including average pressure (10.4% decrease, P = .005) and coefficient of pressure variation (22.1%, P = 2.2×10) at moderate incline. The authors conclude that supine bed positionings at moderate incline appear to reduce predictors of pressure ulceration.

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“…15 Available studies on the responses of the autonomic nervous system to occupational WBV have generally indicated degrees of dysfunction and autonomic imbalance. [16][17][18][19] Harstela and Piirainen noted that exposure to WBV may have a significant effect on decreasing heart rate variability; this can be more significant when the subject is under mental stress. 16 Jiao, et al, reported that WBV might significantly activate the sympathetic and suppress the parasympathetic nervous system leading to increased LF/HF ratio.…”

Section: Introductionmentioning

confidence: 99%

Autonomic Nervous System Responses to Whole-Body Vibration and Mental Workload: A Pilot Study

Jalilian

Zamanian

Gorjizadeh

et al. 2019

Int J Occup Environ Med

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Background: Whole-body vibration (WBV) and mental workload (MWL) are common stressors among drivers who attempt to control numerous variables while driving a car, bus, or train. Objective: To examine the individual and combined effects of the WBV and MWL on the autonomic nervous system. Methods: ECG of 24 healthy male students was recorded using NeXus-4 while performing two difficulty levels of a computerized dual task and when they were exposing to WBV (intensity 0.5 m/s2; frequency 3–20 Hz). Each condition was examined for 5 min individually and combined. Inter-beat intervals were extracted from ECG records. The time-domain and frequency-domain heart rate variability parameters were then extracted from the inter-beat intervals data. Results: A significant (p=0.008) increase was observed in the mean RR interval while the participants were exposed to WBV; there was a significant (p=0.02) reduction in the mean RR interval while the participants were performing the MWL. WBV (p=0.02) and MWL significantly (p<0.001) increased the standard deviation of normal-to-normal intervals with a moderate-to-large effect size. All active periods increased the low-frequency component and low-frequency/high-frequency ratio. However, only the WBV significantly increased the highfrequency component. A significant (p=0.01) interaction was observed between the WBV and MWL on low-frequency component and low-frequency/high-frequency ratio. Conclusion: Exposure to WBV and MWL can dysregulate the autonomic nervous system. WBV stimulates both sympathetic and parasympathetic nervous system; MWL largely affects sympathetic nervous system. Both variables imbalance the sympatho-vagal control as well.

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ECG response of the human body subjected to vibrations

Cited by 11 publications

References 25 publications

Effect of vibrations with two different amplitudes on the ECG

Effect of vibrations with two different amplitudes on the ECG

Proxy Study on Minimizing Risk of Sacral Pressure Ulcers While Complying with Ventilator-Associated Pneumonia Risk Reduction Guidelines

Autonomic Nervous System Responses to Whole-Body Vibration and Mental Workload: A Pilot Study

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