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The effect of skin temperature on vibrotactile sensitivity
634
HUMAN RESPONSE TO VIBRATION
M. J. Griffm 1978 Applied Ergonomics 9, 15-21. The evaluation of vehicle vibration and seats. (7 pages, 6 figures, 2 tables, 8 references) Author’s abstract. Measurements of vibration in a variety of road vehicles in common use are compared with the guidance provided in IS0 2631-1974(E) (Guide for the evaluation of human exposure to vibration). For typical journey durations many of the vibration levels are in excess of levels corresponding to the “reduced comfort boundaries” and “fatigue decreased proficiency boundaries” defined in the IS0 Standard. Some of the problems inherent in comparing the measured vibration levels with the Standard are outlined and the need for a revised format for the Standard is discussed. A method of summarizing the vibration attenuation of vehicle seats is defined and it is shown that the isolation provided by many of the seats of the 16 vehicles used in the study is poor. Topics: Ride (Road Vehicles); Vibration Measurements (Road Vehicles); Seating; Criteria and Limits; Standardization.
V. I. Cemjuk 1974 Gig&a i Sanitarija 6,97-98. Combined action of low-frequency vibration and noise. (2 pages, 2 references) (In Russian) English Abstract. This paper presents an experimental study of the combined action of steady-state noise and low-frequency vibration (e.g., of agricultural machines) on young men who were examined before and after exposure and also after recovery periods of 15 and 30 minutes. It was found that the combined action of low-frequency vibration and noise below the threshold limit gives rise to marked physiological changes. Some of these changes (affecting the stable sag&al vision and the latent period of visual motor response) persist even after a 30 minute recovery period. Topics: Combined Stress (Vibration and Noise); Physiological Effects (General); Perceptual Mechanisms (Vision).
B. G. Green 1977 Perception andPsychophysics 21,243-248. The effect of skin temperature on vibrotactile sensitivity. (6 pages, 5 figures, 18 references) Author’s Abstract. The effect of skin temperature on detection of vibrotactile stimuli was measured for vibrations of 30 and 250 Hz. Data for the 250 Hz stimulus supported the results of Weitz (1941), who found that thresholds for 100,256 and 900 Hz vibration varied as a U-shape function of skin temperature with a minimum at about 37°C. Temperature had a negligible effect on sensitivity at 30 Hz. A second experiment examined a range of frequencies between 30 and 250 Hz. Cooling greatly lowered sensitivity only to 150 and 250 Hz stimuli. Warming reduced sensitivity less, but more uniformly across frequencies. It was concluded that cooling may affect vibrotactile thresholds by decreasing the sensitivity of Pacinian corpuscles: the reason for the decrease in sensitivity due to warming is unclear. Topics: Vibration Sense (Thresholds) ; Combined Stress (Vibration and Heat). T. G. Ptmcev 1976 Gig. Tru. Prof Zabol3, 4%49. Characteristics of conduction velocity of peripheral nerve fibres in workers with vibration disease. (2 pages, 7 references) (In Russian) English Abstract. This paper presents the results of electromyographic examinations in 70 fettlers with vibration disease. The clinical picture showed 3 stages: initial, moderately marked and marked symptoms. The conduction velocity of the motor fibres of the ulnar nerve was normal in the first stage, slightly reduced in the second, and more markedly so in the third. It was possible to relate nerve conduction velocity and muscle reaction time with the stage of development of the disease. Topics: Vibration Syndrome; Physiological Effects (Muscle and Nerve).
HUMAN RESPONSE TO VIBRATION
M. J. Griffm 1978 Applied Ergonomics 9, 15-21. The evaluation of vehicle vibration and seats. (7 pages, 6 figures, 2 tables, 8 references) Author’s abstract. Measurements of vibration in a variety of road vehicles in common use are compared with the guidance provided in IS0 2631-1974(E) (Guide for the evaluation of human exposure to vibration). For typical journey durations many of the vibration levels are in excess of levels corresponding to the “reduced comfort boundaries” and “fatigue decreased proficiency boundaries” defined in the IS0 Standard. Some of the problems inherent in comparing the measured vibration levels with the Standard are outlined and the need for a revised format for the Standard is discussed. A method of summarizing the vibration attenuation of vehicle seats is defined and it is shown that the isolation provided by many of the seats of the 16 vehicles used in the study is poor. Topics: Ride (Road Vehicles); Vibration Measurements (Road Vehicles); Seating; Criteria and Limits; Standardization.
V. I. Cemjuk 1974 Gig&a i Sanitarija 6,97-98. Combined action of low-frequency vibration and noise. (2 pages, 2 references) (In Russian) English Abstract. This paper presents an experimental study of the combined action of steady-state noise and low-frequency vibration (e.g., of agricultural machines) on young men who were examined before and after exposure and also after recovery periods of 15 and 30 minutes. It was found that the combined action of low-frequency vibration and noise below the threshold limit gives rise to marked physiological changes. Some of these changes (affecting the stable sag&al vision and the latent period of visual motor response) persist even after a 30 minute recovery period. Topics: Combined Stress (Vibration and Noise); Physiological Effects (General); Perceptual Mechanisms (Vision).
B. G. Green 1977 Perception andPsychophysics 21,243-248. The effect of skin temperature on vibrotactile sensitivity. (6 pages, 5 figures, 18 references) Author’s Abstract. The effect of skin temperature on detection of vibrotactile stimuli was measured for vibrations of 30 and 250 Hz. Data for the 250 Hz stimulus supported the results of Weitz (1941), who found that thresholds for 100,256 and 900 Hz vibration varied as a U-shape function of skin temperature with a minimum at about 37°C. Temperature had a negligible effect on sensitivity at 30 Hz. A second experiment examined a range of frequencies between 30 and 250 Hz. Cooling greatly lowered sensitivity only to 150 and 250 Hz stimuli. Warming reduced sensitivity less, but more uniformly across frequencies. It was concluded that cooling may affect vibrotactile thresholds by decreasing the sensitivity of Pacinian corpuscles: the reason for the decrease in sensitivity due to warming is unclear. Topics: Vibration Sense (Thresholds) ; Combined Stress (Vibration and Heat). T. G. Ptmcev 1976 Gig. Tru. Prof Zabol3, 4%49. Characteristics of conduction velocity of peripheral nerve fibres in workers with vibration disease. (2 pages, 7 references) (In Russian) English Abstract. This paper presents the results of electromyographic examinations in 70 fettlers with vibration disease. The clinical picture showed 3 stages: initial, moderately marked and marked symptoms. The conduction velocity of the motor fibres of the ulnar nerve was normal in the first stage, slightly reduced in the second, and more markedly so in the third. It was possible to relate nerve conduction velocity and muscle reaction time with the stage of development of the disease. Topics: Vibration Syndrome; Physiological Effects (Muscle and Nerve).