Autonomic Nervous Activity during Hand Immersion in Cold Water in Patients with Vibration-Induced White Finger.

Sakakibara, Hisataka; Luo, Juhua; Zhu, S.-K.; Hirata, Mamoru; Abe, Mitsuru

doi:10.2486/indhealth.40.254

Cited by 20 publications

(14 citation statements)

References 21 publications

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“…Such enhanced vasospastic response to cold is considered to result from an exaggerated central sympathetic vasoconstrictor reflex and local changes in the digital vessels 78) . This explanation is supported by the increase seen in the LF/HF ratio during immersion of the hand of workers with white finger in cold water 33) . Workers with hand-arm vibration syndrome showed decreased HF and LF components during rest when compared with healthy workers 31) .…”

Section: Vibrationsupporting

confidence: 67%

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Heart Rate Variability in Occupational Health ―A Systematic Review

2009

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BackgroundCardiovascular disease (CVD) is the leading cause of mortality and morbidity in industrialized countries 1) . In a working population, occupational factors are believed to pose a threat to workers' cardiovascular health. Substantial research has shown that adverse physical and psychosocial work environments and working conditions, such as shift work and excessive workload, are related to CVD. To examine the acute and chronic effects of such work-related factors on the cardiovascular system, cardiac autonomic nervous system activity during work and rest has been assessed by heart rate variability (HRV).Heart rhythm is recorded by electrocardiography. The measured signal shows a series of waves that present electrical events in the four chambers and the conduction pathways within the heart. The time interval between consecutive R waves that correspond to the contraction of the ventricles is called the RR interval (RRI). HRV is a time series of RRIs that fluctuate beat by beat in healthy humans because of time-to-time changes in activities of sympathetic and parasympathetic nerves innervating to the sinus node.HRV is generated in part by periodic inputs of both respiration and blood pressure variability into the medullary cardiovascular centers 2) . These periodic modulations are clearly identified within the power spectrum of HRV as peaks at the respiratory frequency (≈ 0.25 Hz) and at the frequency of the well-known Mayer wave (0.1 Hz) in blood pressure variability 1,3) .Heart rate increases and decreases during inspiration and expiration, respectively. This is mainly caused by the physiological fact that parasympathetic output from the cardiovascular center is inhibited during inspiration 4) . Respiratory rhythm during rest is about 0.25 Hz. Therefore, exposure to occupational toxicants and hazardous environments), psychosocial workload (i.e. job stressors), and working time (i.e. shift work) had been examined and identified as having associations with low HF power. These findings may indicate that research into parasympathetic nervous system activity should be focused to protect cardiovascular health at work. We also propose the use of very low and ultralow frequency HRV components in autonomic research for workers' health.

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Section: Vibrationsupporting

confidence: 67%

“…Among operators with vibration-induced white finger, the LF/HF ratio increased significantly during immersion of the hand in cold water at 10˚C, but did not increase in healthy controls 33) .…”

Section: Vibrationmentioning

confidence: 99%

Heart Rate Variability in Occupational Health ―A Systematic Review

2009

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“…Raynaud's phenomenon usually is triggered by cold temperatures, or by emotions such as stress and anxiety (Cooke and Marshall, 2005). The pathological mechanisms are related to the high level of sympathetic activity (Stallworth et al, 1981;Sakakibara et al, 2002;Cooke and Marshall, 2005) and low level of CGRP expression in the local sensory fibers (Mourad and Priollet, 1997;Bunker et al, 1996). The island skin flap animal has been used to mimic the vasospastic condition (Linderoth et al, 1995 b;Qi et al, 2002).…”

Section: 15mentioning

confidence: 99%

Putative mechanisms behind effects of spinal cord stimulation on vascular diseases: A review of experimental studies

Linderoth

Foreman

2008

Autonomic Neuroscience

159

106

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Spinal cord stimulation (SCS) is a widely used clinical technique to treat ischemic pain in peripheral, cardiac and cerebral vascular diseases. The use of this treatment advanced rapidly during the late 80's and 90's, particularly in Europe. Although the clinical benefits of SCS are clear and the success rate remains high, the mechanisms are not yet completely understood. SCS at lumbar spinal segments (L2-L3) produces vasodilation in the lower limbs and feet which is mediated by antidromic activation of sensory fibers and decreased sympathetic outflow. SCS at thoracic spinal segments (T1-T2) induces several benefits including pain relief, reduction in both frequency and severity of angina attacks, and reduced short-acting nitrate intake. The benefits to the heart are not likely due to an increase, or redistribution of local blood flow, rather, they are associated with SCS-induced myocardial protection and normalization of the intrinsic cardiac nervous system. At somewhat lower cervical levels (C3-C6), SCS induces increased blood flow in the upper extremities. SCS at the upper cervical spinal segments (C1-C2) increased cerebral blood flow, which is associated with a decrease in sympathetic activity, an increase in vasomotor center activity and a release of neurohumoral factors. This review will summarize the basic science studies that have contributed to our understanding about mechanisms through which SCS produces beneficial effects when used in the treatment of vascular diseases. Furthermore, this review will particularly focus on the antidromic mechanisms of SCS-induced vasodilation in the lower limbs and feet.

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“…Thus, the clinical condition of VWF may be characterized by an excessive vasospastic response to cold, which include the components of enhanced vasoconstriction and impaired vasodilatation of the digital arteries [3][4][5] . A more extreme sympathetic vasomotor activity in response to cold in VWF subjects can cause stronger vasoconstriction and then reduction in cold-induced vasodilatation, and, thereby, lead to considerably decreased blood perfusion during the later phase of immersion 21,22) . The increased vasoconstriction and/or delayed vasodilatation, which produce low opening pressure of the digital arteries, may further contribute to a retarded increase of blood perfusion after the end of hand immersion.…”

Section: Discussionmentioning

confidence: 99%

Laser Doppler Imaging of Skin Blood Flow for Assessing Peripheral Vascular Impairment in Hand-Arm Vibration Syndrome

et al. 2007

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The objective of this study was to evaluate the usefulness of laser Doppler imaging (LDPI) of the skin blood flow for assessing peripheral vascular impairment in the hand-arm vibration syndrome (HAVS). The subjects were 46 male patients with HAVS, aged 50 to 69 yr, and 31 healthy male volunteers of similar age as controls. A cold provocation test was carried out by immersing a subject's hand on his more severely affected side into cold water at a temperature of 10°C for 10 min. Repeated image scanning of skin blood flow of the index, middle, and ring fingers was performed every 2 min before, during, and after the cold water immersion using a PMI-II laser Doppler perfusion imager. The mean blood perfusion values in the distal phalanx area of the fingers were calculated on each image. The patients suffering from vibration-induced white finger (VWF, n=20) demonstrated significantly lower skin blood perfusion at each interval of the test as compared with those without VWF (n=26) and the controls (p<0.01, ANOVA). The blood perfusions in the HAVS patients were associated with the severity of the symptoms as classified by the Stockholm Workshop scale for vascular staging. When a subject was considered to be positive if any of the tested fingers showing a decreased blood perfusion and/or a delayed recovery pattern, the sensitivity was 80.0%, and the specificity was 84.6% and 93.5% for patients without VWF and the controls, respectively. These results suggest that the LDPI technique could provide detailed and accurate information that may help detect the existence of impaired vascular regulation to cold exposure in the fingers of workers exposed to hand-transmitted vibration.

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Autonomic Nervous Activity during Hand Immersion in Cold Water in Patients with Vibration-Induced White Finger.

Cited by 20 publications

References 21 publications

Heart Rate Variability in Occupational Health ―A Systematic Review

Heart Rate Variability in Occupational Health ―A Systematic Review

Putative mechanisms behind effects of spinal cord stimulation on vascular diseases: A review of experimental studies

Laser Doppler Imaging of Skin Blood Flow for Assessing Peripheral Vascular Impairment in Hand-Arm Vibration Syndrome

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