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Biomedical subjects

H J Montoye

Publications and source records attributed to H J Montoye.

At least 19 recordsLinked to original sources
PubMed1992

Variability of some objective measures of physical activity.

The purpose of this study was to determine how many days subjects should be monitored to provide an estimate of habitual physical activity in employed men engaged in a wide range of occupations. Caloric intake, movement recorders (accelerometers and pedometers), and heart rate were the measurements studied in 30 subjects who were monitored during their waking hours for 7 continuous days. A repeated measures ANOVA showed no significant difference between days (P > 0.05) for any of the measures when only weekdays were compared. However, when weekend days were included a majority of the measures showed a significant F-ratio (P < 0.05). An estimate was made of the number of days required to measure a 7-d period with less than 5% error. The average for all the different measures was 4.9 d. It appears that at least 5 or 6 d are needed to minimize the intra-individual variance a reasonable degree. Weekdays as well as weekend days need to be included.

Adult↗
PubMed1991

Comment on heart rate recording in field studies.

This is a report of our experience using the Uniq Heart Watch for recording the heart rate in epidemiologic settings. Relatively few heart rates are missed during occupational and leisure activities. However the mean daily heart rate among subjects is somewhat variable so that several week days and Saturday and Sunday should be monitored to obtain a representative daily average.

Energy Metabolism↗
PubMed1990

Somatotype and longevity of former university athletes and nonathletes.

A longitudinal study was conducted on 398 athletes and 369 nonathletes who were born before 1920 and attended Michigan State University. The subjects were compared to determine if intercollegiate athletic competition accounts for significant variation in longevity when considered with somatotype. Because some of the subjects were still alive at the time of the study, the BMDP Statistical Software was used to do a survival analysis with covariates. Preliminary comparisons considered the differences in somatotype between athletes and nonathletes. Two sample t-tests indicated that athletes were more mesomorphic and less ectomorphic (p less than .05) than nonathletes. When comparing the relationship between somatotype and longevity, the pooled data of athletes and nonathletes indicated that endomorphs were shorter lived than the other three comparison groups. When only the athletes were considered, similar results were found. However, the nonathlete group exhibited differences only between the mesomorphic and endomorphic groups. The endomorphs were shorter lived. Longevity was examined by using the Cox proportional hazards regression method with somatotype and athlete/nonathlete status as covariates. Somatotype, by itself, was found to be significantly related to longevity, (p less than .001). Athletic status was not significantly related to longevity, either by itself or when entered into the model with somatotype.

Age Factors↗
PubMed1989

Comparison of three methods of estimating energy expenditure: caltrac, heart rate, and video analysis.

This study examined the accuracy of a new device (Caltrac) in estimating energy expenditure via acceleration measurements. Energy expenditure of 20 high school students during basketball class activity (average length = 37 min) was estimated using the Caltrac, heart rate recording, and video analysis. Heart rate recording and video analysis estimates of energy expenditure were determined from heart rate, caloric expenditure curves, and an activity rating scale, respectively. The following estimates of caloric expenditure (M +/- SD) were found: heart rate recording = 196 +/- 73 greater than Caltrac = 163 +/- 49 greater than film analysis = 123 +/- 30 kcal (p less than .05). Laboratory simulations of the basketball activity revealed that the Caltrac energy expenditure was not significantly different from the actual energy expenditure (p greater than .05). The heart rate recording and video analysis estimates of energy expenditure were significantly (p less than .05) higher and lower, respectively, than the actual energy expenditure. The Caltrac is a lightweight, low-cost device that provides a relatively accurate estimate of energy expenditure in free-ranging activities, such as basketball.

Adolescent↗
PubMed1989

The validity of a portable accelerometer for estimating energy expenditure in bicycle riding.

The purpose of the investigation was to determine the validity of a portable vertical accelerometer and a Large-Scale Integrated Motor Activity Monitor (LSI) for estimating energy expenditure in riding a bicycle at various velocities. Instrument placement was either at the knee or ankle. Energy consumption, i.e. oxygen consumption (VO2) was determined during bicycle rides after steady state metabolism was reached. Standard errors of estimate were used to express the accuracy of estimating VO2 from accelerometer or LSI recordings. The reliability of the vertical accelerometer was found to be satisfactory. The vertical accelerometer was also effective for estimating VO2 in bicycling (standard errors of estimate = 3.3 to 4.4 ml.kg-1.min-1). The accuracy of the LSI was not as good; the standard errors of estimate being = 5.9 to 8.5 ml.kg-1.min-1.

Adolescent↗
PubMed1985

The oxygen requirement for horizontal and grade walking on a motor-driven treadmill.

Oxygen uptake (VO2) was measured in males age 10-59 while they walked at 3 mph at various grades on a motor-driven treadmill. The number of subjects in each age group was as follows: age 10-11, N = 24; age 12-13, N = 46; age 14-15, N = 55; age 16-17, N = 53; age 18-19, N = 30; age 20-24, N = 56; age 25-29, N = 35; age 30-34, N = 32; age 35-39, N = 99; age 40-44, N = 106; age 45-49, N = 78; age 50-54, N = 42; and age 55-59, N = 11. Subjects walked at 3 mph at 0% grade for 3 min; thereafter, the treadmill was raised 3% every third minute with speed maintained. Oxygen uptake was measured continuously but only the values during the last minute at each grade were used in the present analysis. The subjects were in a "steady state," insofar as VO2 was concerned, by the second minute. These data were used to validate formulas for estimating VO2 in horizontal and grade walking published in Guidelines for Graded Exercise Testing and Exercise Prescription (1). The formulas are accurate for estimating the mean oxygen requirement in grade walking from 6-18% in adult males. In horizontal walking and walking at 3% grade, the formulas underestimate VO2 in all age groups. In boys under age 18, the formulas underestimate the energy requirement in walking at all grade levels.

Adolescent↗
PubMed1978

Relationship of oxygen uptake capacity, serum uric acid and glucose tolerance in males and females, age 10-69.

Age 10-69, 793 males and 80 females were tested on the treadmill as they walked at 4.83 km per hour (3.27 km per hour in subjects 60 years and older). Every three minutes, the grade was increased 3%. Maximal oxygen uptake (VO2max.) and related measurements were recorded during the third minute at each grade. Subjects age 10-39 exercised to exhaustion and VO2max. was measured. In subjects age 40-69, VO2max. was estimated from sub-maximal VO2 and heart rate. The sum of four skinfolds, serum uric acid (SUA) and one-hour glucose tolerance were also measured on these subjects. Body fatness was positively correlated with SUA and blood glucose and negatively correlated with VO2max. Age was negatively correlated with VO2max. and positively correlated with blood glucose. After removing the effects of age, weight and fatness, the correlation of VO2max. and SUA was low. Similarly, there was little or no correlation between VO2max. and blood glucose after the effects of age, weight and fatness were removed.

Adolescent↗
PubMed1977

Glucose tolerance and physical fitness: an epidemiologic study in an entire community.

A modification of the Harvard Step Test was administered to approximately 4700 males and females, age 10-69 in Tecumseh, Michigan. Heart rate response to this standardized exercise test is an estimate of capacity for muscular work. A blood sample was drawn 1 h after a glucose challenge on the same day the exercise test was given. Four skinfolds were measured as an index of body fatnes. It was the purpose of this analysis to study the relationship of glucose tolerance to heart rate response to exercise. All analyses were done in age and sex-specific sub-groups. The correlation coefficients are low but positive in all but one sub-group and half of the coefficients are statistically significant. This suggests that poor fitness for work (high heart rate in response to exercise) was related, albeit weakly, to lowered glucose tolerance. However, there is a positive relationship between body fatness on the one hand and serum glucose and heart rate response to exercise on the other. When the effect of body fatness was eliminated the relationship of heart rate response to exercise ahd glucose tolerance remained about the same; low but statistically significant in some age groups.

Adolescent↗
PubMed1977

Habitual physical activity and glucose tolerance. Males age 16-64 in a total community.

The data being reported are part of an epidemiologic study of health and disease in an entire community, Tecumseh, Michigan. Approximately 1,300 males age 16-65 were classified into three groups on the basis of their habitual leisure and occupational physical activity. A blood sample was drawn one hour after a glucose challenge and analyzed for glucose concentration. A measure of body fatness (sun of four skinfolds) was also available on the men. Glucose concentration of the three physical activity groups was compared by analyses of variance within narrow age group. There was no significant relationship between glucose tolerance and habitual physical activity. There was a slight, but in some age groups significant, relationship between glucose tolerance and body fatness. The population was then divided within each age group into subgroups (thirds) by sum of skinfolds. The analysis was repeated in each age-fatness group. Glucose tolerance was better in the active men but only among the leanest subgroup of subjects.

Adipose Tissue↗