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Biomedical subjects

S Shiomi

Publications and source records attributed to S Shiomi.

At least 127 records · Page 7Linked to original sources
PubMed1983

Epidemiological study of vibration syndrome in response to total hand-tool operating time.

The correlation between the severity of vibration syndrome and hand-tool operating time in chain saw workers has been studied. The total chain saw operating time was calculated by using the equation: chain saw operating hours/day X days/year X years, and 266 chain saw operators were classified into four groups (0-2000 h, 2000-5000 h, 5000-8000 h, over 8000 h). Forty-six forestry workers not using chain saws were used as controls. The prevalence rates of symptoms were checked and statistically compared in each group. In the group with under 2000 hours' experience, symptoms were generally confined to tingling, numbness, or pain; with 2000-5000 hours peripheral nerve and circulatory disturbances, including Raynaud's phenomenon, and muscle and general body conditions were influenced to some degree; with 5000-8000 hours' functional changes were noted; while with over 8000 hours about half the operators suffered severely from functional or organic changes due to vibration.

Adult↗
PubMed1982

Urinary excretion of hydroxyproline in workers occupationally exposed to vibration.

Urinary hydroxyproline excretion was measured in 130 chain saw operators aged 28-59 and in 31 normal control subjects aged 26-59 with no occupational exposure to vibration. The results measured were expressed as a ratio of hydroxyproline to creatinine. (1) No significant correlation between hydroxyproline/creatinine ratio and age was observed among normal subjects. (2) In chain saw operators grip and pinch strength decreased gradually with an increase of the total chain saw operating time, while the prevalence of pain in the hands or motility disturbance in the elbow joints showed a tendency to become greater as total operating time increased. Hydroxyproline/creatinine ratio in the group with over 9000 hours' experience was significantly higher than that in the group with under 3000 hours (p less than 0.05). By comparison with controls, the ratio in the group with over 3000 hours was significantly higher at the 5% level. (3) Hydroxyproline/creatinine ratio in the group with pain in the hands or with motility disturbance in the elbow joints was significantly higher than that in the group without them (p less than 0.05). (4) Hydroxyproline/creatinine ratio was inversely correlated with grip and pinch strength in operators ranging in age from 40 to 49 (p less than 0.01). (5) All individual ratios for operators with lower grip strength showed a higher increment than the mean values obtained from controls. These results indicate that increased urinary hydroxyproline excretion in chain saw operators may occur in association with damage to the musculoskeletal system caused by the prolonged use of vibrating tools.

Adult↗
PubMed1982

[Left ventricular hypertrophy in hypertensive and athlete's hearts: echocardiographic and vectorcardiographic characteristics].

The difference in the patterns of left ventricular hypertrophy (LVH) between the athlete's heart (Judo player: Judo-Ath group) and the hypertensive heart (HT group) was studied using vectorcardiography and echocardiography. The both groups were classified into two types based on the pattern of a QRS loop vector in the horizontal plane, respectively. One type (type II) satisfied the vectorcardiographic criteria of LVH by Upshaw, and the other (type I) did not satisfy it. The subjects composed of 12 Ath-I, 18 Ath-II, 10 HT-I and 16 HT-II. In the Ath-I, the characteristic vectorcardiogram was demonstrated in the horizontal plane, where an increased amplitude of an initial QRS vector was in the right and anterior direction. A mean ratio of the thickness of the interventricular septum to left ventricular posterior wall (IVSTd/PWTd) was 1.20 (p less than 0.001) in their echocardiograms. In HT-I, on the other hand, a decreased amplitude of an initial anterior vector and an increased amplitude of a posterior vector were observed in the horizontal plane. IVSTd and PWTd did not increase in these patients. These results indicated that an increased amplitude of an initial QRS vector in Ath-I is a reflection of the increased IVSTd. In type II, both IVSTd and PWTd were symmetrically increased. Concerning a spatial maximum QRS magnitude and left ventricular mass (LV mass), there was a significant correlation between the two only in HT-II (r = 0.75, p less than 0.01). It was concluded that there was some vectorcardiographic and echocardiographic differences between the left ventricular hypertrophic patterns of the athlete's heart and the hypertensive heart.

Adult↗
PubMed1981

[The effect of aging on the peripheral functions in farmers and chain saw operators part 1. age-related changes in pain and vibratory sense thresholds (author's transl)].

Vibration hazards caused by using vibrating tools include such disorders as peripheral circulatory disturbances, peripheral nervous disturbances and abnormalities of the bones and joints. It is generally acknowledged that the effect of physiological aging on the nervous system gradually increases with age. In this paper, therefore to assess the effect of aging on the peripheral nervous function as evaluated by pain and vibratory sense thresholds of fingers, 135 farmers and 130 chain saw operators ranging in age from 30 to 69 years were examined. Moreover, 27 normal persons aged between 21 and 37 years served as the control for comparison. The results obtained were as follows: 1) In the control subjects, there was no age-related change in the pain threshold. However, the vibratory sense threshold at a frequency of 125 Hz or 250 Hz showed a tendency to increase with advancing age. 2) In both farmers and chain saw operators, thresholds in the pain and the vibratory sense at a frequency of 125 Hz or 250 Hz showed a tendency to increase with advancing age. 3) The pain thresholds in chain saw operators seemed to be slightly higher than those in farmers in all age groups, but the differences were not statistically significant. On the other hand, the vibratory sense thresholds at a frequency of 125 Hz or 250 Hz in chain saw operators were significantly higher by 5 dB than those in farmers in all age groups. From these results it is suggested that we have to use age-adjusted standard criteria in evaluating thresholds of the pain and the vibratory sense at a frequency of 125 Hz or 250 Hz.

Adult↗
PubMed1981

[The effect of aging on the peripheral functions in farmers and chain saw operators. Part 2. Age-related changes in skin temperature and hyperemia time after pressing the nail (author's transl)].

Vibration hazards which arise after exposure to mechanical vibration comprise various types of disorders, the most common of which are peripheral circulatory disturbances. It is now well recognized that aging effects all organ systems of the human body. The present study was therefore performed to assess the effects of aging on finger skin temperature and on hyperemia time after pressing the nail, both of which reflect peripheral circulatory functions. The subjects were 88 farmers and 86 chain saw operators ranging in age from 30 to 69 years, and 27 healthy persons aged 21 to 37 years as controls. Data were evaluated before and after cold water immersion tests in which the hand was immersed in 10 degrees C water for 10 minutes. The results obtained were as follows: 1) Before the test, skin temperature was negatively correlated with age, and hyperemia time was positively correlated with age in both farmers and chain saw operators but not in the case of the control subjects. 2)The skin temperature became lower, and hyperemia time grew longer with advancing age in both farmers and chain saw operators before and after the immersion tests. In comparison of the average skin temperature and hyperemia time between farmers and chain saw operators classified by age, the average skin temperature in chain saw operators was significantly lower than that in farmers, and the average hyperemia time in chain saw operators was significantly longer than that in farmers of every age group after the immersion test. The results suggest that we should take age-related changes into consideration to some degree when we evaluate the finger skin temperature and hyperemia time in diagnosing peripheral circulatory disturbances.

Adult↗
PubMed1980

[A study on the peripheral circulatory function and on the cold pressor response in chain saw operators (author's transl)].

Among the vibration hazards resulting from the use of vibrating tools, Raynaud's phenomenon, the peripheral nervous disturbances and the bone-joint abnormalities have been well known. Especially, Raynaud's phenomenon, which is explained as a spasm of the peripheral vascular vessels caused by disorders of the peripheral nerves or abnormalities of the arteriolae, represents the peripheral circulatory disturbance. In the worker with such a disorder of the peripheral circulatory function, it is likely that the mechanism of the cold pressor response would have been changed. The authors examined the relationship between the peripheral circulatory function and the cold pressor response in 51 chain saw operators. The following examinations were carried out: skin temperature, nail-press test and cold pressor test by 10-minute-immersion in 10 degrees C water. There was statistically an inverse correlation (r=-0.316, P < 0.025) between the increase in systolic blood pressure at the second minute during immersion and the mean skin temperature of the finger-tip during the latter half of 10-minute-immersion. It would be surmised from this result that the worker with lower peripheral circulatory function tends to increase the excitability in the sympathetic nervous system.

Adult↗
PubMed1979

The effect of high tibial osteotomy on osteoarthritis of the knee. An arthroscopic study of 54 knee joints.

1. Arthroscopic findings in repair of articular surfaces and the operation's effect on healthy components made it clear that the ideal correction method is to align the mechanical axis to pass through a point 30 to 40 per cent lateral to the midpoint. 2. If ideal correction was obtained, it was observed by arthroscopy that repair of the ulcerated region was initiated by the surviving cartilage in the affected area and the cartilage bordering the affected area. 3. About one and one-half to two years after osteotomy it was observed that the ulcerated region was thoroughly covered with fibrous and membranous tissue. 4. In some cases in which correction was ideal, repair of the ruptured meniscus was observed arthroscopically.

Cartilage, Articular↗