摘要:

Aerobic work capacity (maximum oxygen uptake) of indigenous populations in various countries has been determined by using treadmill walking and bicycle ergometry (1–7, 9–12, 14–23). The maximum oxygen uptake during treadmill work was consistently higher (7–15%) than during bicycle work. Since both incremental and constant loading procedures have been used in determining maxVo2, one must consider the methods used in obtaining maxVo2before drawing any conclusions. Hence, for comparing maximum oxygen uptake between various indigenous populations, it would be important to standardize the procedure to be used. Recently, the I.B.P. (International Biological Program) set a standard method for the measurement of work capacity. This study was concerned with the measurement of aerobic work capacity on Japanese ranging from 8 to 31 years old, by using die method described in the I.B.P. Handbook No. 9.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

An investigation was undertaken to obtain specific, data relating respiratory valve dead space to changes in ventilation volumes. Four commercially available, commonly used, breathing valves were used to measure ventilation (VE) and oxygen consumption (Vo2) at rest and several levels of treadmill exercise. Ventilation increased as valve dead space increased and was independent of breathing frequency. The largest dead space (Triple–J valve, 300 ml) produced the greatest ventilatory increases at rest ranging from 16 to 11218 greater than the ventilatory volumes measured with the Lloyd valve (48 ml dead space). Analysis of ventilatory volumes for a low (48 ml) and a high dead space valve (300 ml) yielded significantly different values (P < .05) at rest and all levels of exercise except near maximal. Vo2values for all valves (36–300 ml dead space) were not significantly different. The effects of added dead space are important when measuring ventilation volumes.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Relationship between cardiovascular fitness (heart rate response to a submaximal step-test) and smoking habits, chronic lung disease, and ventilatory lung function was studied in 3,400 males and females (ages 16 to 69).It was observed that male smokers had significantly higher heart rates 1 min. after exercise than non-smokers, (P = 0.05). Female smokers had significantly higher heart rates at rest and following exercise. Male chronic bronchitics had significantly higher heart rates during exercise and recovery. Differences were not significant for female subjects. In the comparison of the heart rates in exercise or rest for those subjects with shortness of breath a significant difference was found in the recovery heart rates of males and at rest for females. In the comparison of the heart rate responses to exercise of subjects with high or low F.E.V.1.0values, the differences across all ages were not significant.Age specific analyses indicated significant differences at particular age ranges.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Eight elderly but healthy male subjects (mean age 71.1 years) were evaluated for response of heart rate, systolic blood pressure and pulmonary ventilation during 6 minute exercise bouts at three levels of intensity on each of three types of exercise. One type of exercise, crawling, involved heavy rhythmic activity of both legs and arms; a second, walking, involved only heavy work of the legs; the third was cycling where leg work was heavy and moderate isometric contractions of the upper limb muscles occurred. Integrated electromyographic data were also taken during die exercise bouts in order to estimate quantitatively the relative loading of each of twelve groups of muscles and also the amount of total muscle mass activated (TMMA). It was our purpose to evaluate the contribution of relative loading and TMMA as determinants of the responses of heart rate, blood pressure, and ventilation to the different exercises in older men.Multiple regression analysis of the data suggests that the systolic blood pressure response was largely determined by the relative muscle loading factor as has been suggested by the work of Lind and McNicol (12,13,14). Heart rate and pulmonary ventilation were better related to die TMMA.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Achilles Tendon Tenosynovitis is a chronic, disabling condition seen in long-distance runners. Conservative treatment frequently fails to give satisfactory results and often requires a very prolonged period of treatment. The author presents four cases, three of which were treated surgically with very satisfactory results and prompt return to competition. It is suggested that a more vigorous attack on this condition with surgical decompression of the heel cord be used in athletes.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

The use of anabolic steroids to increase muscle mass has become widespread despite FDA warnings against using these potent drugs to enhance performance. The present investigation was undertaken to determine the effects of 6 weeks administration of Dianabol (methylandrostenolone) upon levels of performance, organ weights, heart rate and systolic blood pressure in adult male albino rats. Animals were injected daily (S.Q.) with a placebo (sesame oil), low dose (μmg/kg) or high dose (5mg/kg) of Dianabol and subjected 5 days/week to one of 3 treatments: sedentary housing, high jumping exercise or treadmill running. At sacrifice, internal organs were extracted and weighed to the nearest mg. Adrenal gland, brain and heart weights significantly increased among runners. Heart, kidney and liver weights significantly increased in rats injected with low doses, whereas, only testes weight decreased in rats exposed to high doses of drug. Performance was not affected by either high or low dose users of Dianabol throughout the week regimen.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Twenty-six high school football teams playing 228 games in the Seattle metropolitan area were prospectively studied during the fall of 1970. Eighty games were played on a synthetic field and the remainder were played on grass fields.Injury rates for games played on the synthetic surface were significantly higher than those played on grass. The incidence of serious injuries was also higher on synthetic surfaces.The higher injury rates for games played on synthetic surfaces was almost wholly a function of die even higher injury rate on the artificial surface in the dry condition.The role played by field surface in die production of football injuries merits further investigation. These investigations should include die other types and models of synthetic turf currently available.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

As part of a comprehensive four-year study of high school football injuries, adequate baseline data which permits accurate description of the extent of the problem of head and other injuries incurred during participation in contact football related to the helmet exists. These data resulted from analysis of over 4,200 injuries occurring in a student athlete population of some 7,800 youths. These data included 285 concussion injuries.The analysis and interpretation of these data shows: (1) tile contribution of specific types of headgear by fit and condition to be causally associated with injuries to the wearer; (2) the contribution of protective headgear to significant injury rates to participants other than the wearer; and, (3) the need for standards and their strict enforcement in the design, construction and quality of football helmets.

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID

ISSN:0025-7990    

出版商:OVID    

年代:1972

数据来源: OVID