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Biomedical subjects

J E Misner

Publications and source records attributed to J E Misner.

31 records · Page 2Linked to original sources
PubMed1988

Leg power characteristics of female firefighter applicants.

The primary purposes of this study were to characterize the anaerobic power of a large group of adult female subjects and to analyze the relationship of body composition, leg power, and leg strength tests to performance on the Wingate Anaerobic Test (WAT) in these women. A secondary purpose was to observe the relationship of the WAT to a stair-climbing test used to select firefighters. The subjects were the top 150 of the 1,090 women who took a firefighter applicant physical performance test. Predicted dependent variables from the WAT were mean power (MP), peak power (PP), and percent fatigue (%F). Among the nine independent variables entered into multiple regression analysis (age, height, weight, fat-free weight, percent fat, leg press strength, vertical jump, maximal physical work capacity (PWCmax) and stair climb) 45%, 40%, and 16% of the variance in MP, PP, and %F were accounted for. Fat-free weight accounted for the most variation in MP and PP, and PWCmax accounted for the most variation in %F. There was little relationship observed between MP, PP, or %F and the stair-climbing test.

Body Composition↗
PubMed1988

Hemodynamic responses to positional change in habitually physically active and inactive older men.

This study explored hemodynamic responses to positional change in 11 habitually physically active and 11 physically inactive healthy older men (mean age 70 years). Data were collected in the supine, sitting, standing, and 70 degrees upright tilt positions over a 10-minute period (long-term response). Dependent variables were heart rate, stroke volume, cardiac output, total peripheral resistance, and blood pressure. Stroke volume, cardiac output, and total peripheral resistance were expressed per unit body surface area. The results of this study indicated that the physically active older men had significantly lower resting heart rates and significantly higher stroke volume indices in all four positions compared with the physically inactive men. The physically active men also tended to have lower total peripheral resistance indices and higher cardiac indices in all four positions, but the differences were not statistically significant. However, physically active and inactive older men reacted similarly (with respect to all hemodynamic variables except the stroke volume index) in the sitting, standing and 70 degrees upright tilt positions as compared with the supine; the stroke volume index decreased significantly more compared with that of the supine in the physically active men.

Aged↗
PubMed1987

Performance differences between males and females on simulated firefighting tasks.

Males and females were compared on several physical performance test items. The tests included five tasks used by the City of Chicago to select firefighters as well as four new test items that were designed to reflect recent changes in firefighting procedures. Sixty-two subjects (37 males, 25 females) 17-31 years of age were tested twice with 1 week intervening on a battery of tests that included measurements of body size and composition and the nine physical performance tests. Results indicated that the tests were reliable, but substantial improvement was observed on all items from the first test to the second test. Also, fatness was found to have a negative influence on physical tasks in which the body weight was translocated either vertically or horizontally; conversely, fat-free weight had a positive influence on performance in tasks requiring application of force such as lifting, carrying, and striking activities. Finally, females demonstrated lower scores than males on all physical performance items.

Adolescent↗
PubMed1978

Secular variation in frequency of premature ventricular contractions in untreated individuals.

Six-hour electrocardiographic monitorings were initially recorded from 40 ambulatory adult subjects (39 male, one female) on successive days. Thirty-eight of the subjects were monitored 6 weeks to 18 months later. Studies of paired time periods, Poisson modeling, and other statistical examinations were performed. Despite an underlying consistency in the data, there was considerable variation in PVC frequency from hour to hour, day to day, and over longer periods of time.

Adult↗
PubMedDate not supplied

The clinical importance of the anaerobic energy system and its assessment in human performance.

The anaerobic energy system is involved in providing energy for all forms of physical activity. The relevance of this system to human performance and physical fitness throughout the age spectrum is underscored here and contrasted with the aerobic energy system. The anaerobic system responds to high-intensity training with biochemical, neural, and anatomic adaptations. Unlike the aerobic system, this response tends to be primarily a local phenomenon with little systemic adaptation. An important factor distinguishing anaerobic training from aerobic training is the intensity of the exercise dose. For anaerobic training to occur, the dose must be of high intensity and performed to near-exhaustion. The anaerobic system can be indirectly assessed by performance tests, such as a vertical jump or stair climb, or more directly by supramaximal bicycle tests. The impact of recent research regarding the trainability of the anaerobic system, particularly in the elderly population, is encouraging. The elderly respond to anaerobic training and, as a result, their independence, quality of life, and safety from falls can be improved. While little is known about anaerobic rehabilitation after injury, it is known that isokinetic and performance tests may be considered normal after rehabilitation, despite incomplete rehabilitation of the anaerobic system. Thus, appropriate application of the anaerobic system assessments and training principles is an important aspect of sports medicine practice.

Adolescent↗