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Biomedical subjects

W B Strong

Publications and source records attributed to W B Strong.

At least 127 records · Page 7Linked to original sources
PubMed1978

The physical working capacity of healthy black children.

The exercise performance of 170 black boys and girls, 7 to 14 years of age, was evaluated on a mechanically braked bicycle ergometer. The protocol is simple to perform in the hospital or in the field with normal children or children with heart or pulmonary disease. The results of the physical working capacity at a heart rate of 170 beats per minute (PWC170), a submaximal workload, are comparable to values previously recorded in California children. For a given body surface area, boys and girls younger than 10 years of age had similar PWC170 but boys 11 years and older had a greater capacity than girls of similar age or body surface area. There was a significant correlation between PWC170 and total work performed for boys (r = .81) and girls (r = .69).

Adolescent↗
PubMed1978

Blood pressure response to isometric and dynamic exercise in healthy black children.

One hundred seventy healthy black boys and girls (76 boys and 94 girls) had their systolic blood pressure (BP) determined at rest, during submaximum and maximum dynamic exercise, and in response to isometric exercise. Differences in BP between boys and girls were not significant. Blood pressure response to both dynamic and isometric exercise correlated with age and body surface area. Differences between resting BP and the BP during isometric exercise (BPiso), submaximum dynamic exercise (deltaBP170) and maximum dynamic exercise (deltaBPmax) for boys were: deltaBP150 18 +/- 9, deltaBP170 40 +/- 16 and deltaBPmax 55 +/- 17. Corresponding values for girls were: 16 +/- 8, 36 +/- 14 and 47 +/- 16. The higher the resting BP the less was the percentage change in BP to each stress.

Adolescent↗
PubMed1978

Exercise electrocardiography of health black children.

Exercise electrocardiography was performed on 170 healthy black children 7 to 14 years of age in order to determine the normal childhood electrocardiographic response to exercise. R-wave amplitude decreased from 27 +/- 8 (SD) to 22 +/- 8 mm (P less than .01) and the S-wave amplitude increased from 6.9 +/- 4.4 to 7.8 +/- 5 mm (P less than .01), indicating a shift of the mean QRS vector to the right at maximum exercise. J-point depression of 1.0 mm or greater was observed in 2.3% of children at maximum exercise, using the PR isoelectric line. ST-segment slope increased from 1.5 +/- 0.7 to 4.3 +/- 1.5 mV/sec at maximum. T-wave duration decreased with exercise and T-wave amplitude initially decreased with mild exercise but exceeded resting values at maximum exercise. No dysrhythmias were observed during or after the exercise study.

Adolescent↗
PubMed1978

Exercise electrocardiography in the evaluation of cardiac dysrhythmias in children.

Exercise electrocardiography is a useful means to evaluate dysrhythmias in children and young adults. Exercise may suppress a dysrhythmia present at rest and thus suggest a relatively benign problem. It may provoke a latent dysrhythmia which is absent at rest but suggested by a history of exercise intolerance or palpitation with exertion. Exercise may also modify a dysrhythmia. Maximum exercise testing has been used to evaluate each of these situations in children. The results of testing will be presented. Since no dysrhythmias were provoked in 170 healthy children, we think that any dysrhythmia initiated by exercise in the young should be considered abnormal.

Adolescent↗
PubMed1977

The exercise electrocardiogram in trained and untrained adolescent males.

Exercise electrocardiograms (Ex ECG) were performed on both trained and untrained adolescent males to determine whether a difference exists between the normal adolescent and normal adult male. Exercise was performed on a mechanically braked bicycle ergometer using an intermittent work load protocol, and the Ex ECG's were analyzed according to J-point displacement and ST segment slope. No J-point depression was seen and the ST segment slope was positive during exercise in both trained and untrained subjects. There was no difference in the J-point displacement or the ST segment slope between the trained and untrained subjects. This study suggests that any J-point depression during exercise may be abnormal in the adolescent male. Training does not have an effect on the J-point or ST segment at maximum exercise.

Adolescent↗
PubMed1975

Primary prevention of atherosclerosis: nutritional aspects.

The changes suggested for reducing consumption of calories, cholesterol, and sodium are not radical but sensible. These modifications are nutritionally sound suggestions which will lead to the development of good dietary habits which may be continued throughout life. Hopefully, this will prevent the child from entering adulthood with habits inappropriate for longevity and subsequently having to face the extremely difficult task of changing well-established habits.

Arteriosclerosis↗
PubMed1975

Primary prevention of atherosclerosis: a challenge to the physician caring for children.

This review article stresses the importance of prevention in the reduction of the incidence of artherosclerotic disease, especially coronary heart disease. Evidence accumulated from autopsy studies, animal experimentation, and long-term epidemiologic studies supports the concept that atherosclerosis has its inception in childhood. Adult programs designed to change life styles and attitudes or reverse morphologic changes appear doomed to failure. Therefore, if nutritional, physical activity, and smoking habits are to be altered, it is essential to begin these efforts in infancy and childhood.

Adolescent↗