Effect of whole-body vibration and driving a forest machine simulator on some physiological variables of the operator.

Harstela, Pertti; Piirainen, Kimmo

doi:10.14214/sf.a15419

Cited by 3 publications

(4 citation statements)

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“…The observed mean increase in heart rate that arose from operating work (ratio between rest and work values = 1.56) was notably higher than the increase in heart rate due to driving a car in a wide range of situations and traffic conditions (ratio = 1.14; Heyes, Armstrong, & Williams, 1976). many other authors (e.g., Charnock & Manenica, 1978;Egelund, 1982;Harstela & Piirainen, 1981, 1985Luczak, 1979;Malik, 1996;Wildervanck et al, 1978). Moreover, significant changes in mean overall variability in heart rate as well as in MF% due to operation also expressed mentally strenuous characteristics of the work: Significant decrease in heart rate variability, relative increase in MF% due to mental stress, or both have been observed earlier by HARVESTER OPERATORS' MENTAL WORKLOAD Note.…”

Section: Discussionmentioning

confidence: 70%

“…One explanation for this may be the increased sensomotoric activity, mental strain, and whole-body vibration (Harstela & Piirainen, 1981, 1985Salminen, 1981). First, increase in heart rate and decrease in variability in heart rate were observed as a function of motoric and mental activities during the operation of forestry machines.…”

Section: Ergonomic Characteristics Of the Harvester Operators' Workmentioning

confidence: 99%

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Assessing Harvester Operators' Mental Workload Using Continuous ECG Recording Technique

Tynkkynen¹

2001

International Journal of Cognitive Ergonomics

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In this case study, operators' cardiovascular activity was observed during the operation of modern forestry machinery. In addition to heart rate, power spectral analysis was used to indicate how the variance distributes as a function of frequency. As has been pointed out in previous studies, changes in relative power, especially at medium frequencies (MF), have been found to indicate the amount of mental workload. The results illustrated that operating a modern single-grip harvester causes relatively high mental workload. Moreover, significant differences in cardiovascular activity during different work tasks were observed.

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Section: Discussionmentioning

confidence: 70%

Section: Ergonomic Characteristics Of the Harvester Operators' Workmentioning

confidence: 99%

Assessing Harvester Operators' Mental Workload Using Continuous ECG Recording Technique

Tynkkynen¹

2001

International Journal of Cognitive Ergonomics

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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%

“…[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. 18 In another study, Zhang, et al, suggested that concurrent performing of a driving task and exposure to WBV increases the LF/HF ratio and decreases the RMS of the successive differences of the heart rate.…”

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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Work postures and strain of workers in nordic forest work: A selective review

Harstela¹

1990

International Journal of Industrial Ergonomics

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Effect of whole-body vibration and driving a forest machine simulator on some physiological variables of the operator.

Cited by 3 publications

References 0 publications

Assessing Harvester Operators' Mental Workload Using Continuous ECG Recording Technique

Assessing Harvester Operators' Mental Workload Using Continuous ECG Recording Technique

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

Work postures and strain of workers in nordic forest work: A selective review

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