Robert L Mirwald
Biographic Data
| ID | 138491 |
|---|---|
| NAME | Robert L Mirwald |
| GIVEN NAMES | Robert L |
| FAMILY NAME | Mirwald |
| SIGNATURE | MIRWALD R L |
| AFFILIATIONS | University of Saskatchewan |
| VERIFIED | No |
| TOTAL WORKS | 15 |
| TOTAL CITATIONS | 9 |
| WORKS AS AUTHOR | 15 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1981 |
| LATEST PUBLICATION YEAR | 2020 |
| H-INDEX | 1 |
Patterns of physical performance spurts during adolescence
Data relating physical performance to the timing of the adolescent growth spurt are limited. Aim: This study identifies: (i) age-at-peak height velocity (APHV), (ii) physical performance spurt patterns aligned to APHV; and (iii) cross-cultural and time patterns in Canadian, Brazilian and Portuguese boys. Subjects and methods: A total of 512 boys (131 Canadian, 250 Portuguese and 131 Brazilian), 8-17 years of age were followed serially using longi…
Tracking of aerobic fitness from adolescence to mid-adulthood
Aerobic fitness has a low tracking between APHV and adulthood
The relationship between body composition and onset of menarche
Data on 61 girls were retained for analysis. The range in BM, TBF and %BF at menarche was 50.10 kg, 35050.06 g and 31.61%, respectively. Reductions in variability of body fat and weight were not apparent at menarche, which does not provide support for the hypothesis that a critical body weight/fat is required for menarche
The influence of dance training on growth and maturation of young females
Results suggest that moderate-high levels of dance training do not affect linear growth and maturation. Thus, girls should not be discouraged from dance participation on the basis of potential growth delays
Limitations to the use of secondary sex characteristics for gender comparisons
Boys and girls differ in the timing and tempo of somatic and sexual maturity. Thus boys and girls should not be aligned on secondary sex characteristics when controlling for the confounding effects of maturity
A longitudinal analysis of sex differences in bone mineral accrual in healthy 8-19-year-old boys and girls
Although a statistical significant sex effect is observed, it is less than the error of the measurement, and thus sex difference are debatable. In general, sex difference are explained by anthropometric difference
A Longitudinal Study of the Impact of Childhood and Adolescent Physical Activity Experiences on Adult Physical Activity Perceptions and Behaviors
The authors describe the influence of childhood and adolescent physical activity on adult physical activity attitudes and behaviors. They conducted one-on-one, semistructured, in-depth interviews with 16 men and 15 women from a longitudinal growth and development study and a follow-up investigation 25 years later. They used thematic analyses to analyze the data. Three themes emerged from the men's interviews: significant others, size and maturati…
An assessment of maturity from anthropometric measurements
Secular trend in the development of fatness during childhood and adolescence
This study examined the development of fatness, as indexed by skinfold thickness, in healthy Caucasian children and adolescents residing in the same location in Canada in the 1960s and the 1990s. The data comes from two longitudinal studies, conducted approximately 30 years apart, of children aged 8–16 years. The first study (1964–1973) annually measured 207 males and 140 females. The second investigation (1991–1997) repeatedly measured 113 males…
Timing and magnitude of peak height velocity and peak tissue velocities for early, average, and late maturing boys and girls
Height, weight, and tissue accrual were determined in 60 male and 53 female adolescents measured annually over six years using standard anthropometry and dual-energy X-ray absorptiometry (DXA). Annual velocities were derived, and the ages and magnitudes of peak height and peak tissue velocities were determined using a cubic spline fit to individual data. Individuals were rank ordered on the basis of sex and age at peak height velocity (PHV) and t…
Somatotypes of 7- to 16-year-old boys in Saskatchewan, Canada
The purpose of this study was to examine the stability of somatotypes of 63 boys in Saskatoon, Canada who were followed from 7 to 16 years of age. Somatotype photos were taken annually and rated by a criterion rater (BH-R). Comparisons were made longitudinally across all years using repeated-measures ANOVAs of the whole somatotype (S), somatotype attitudinal means (SAM), analysis of categories, separate components (endomorphy, mesomorphy, ectomor…
Somatotypes of 7‐ to 16‐year‐old boys in Saskatchewan, Canada
The purpose of this study was to examine the stability of somatotypes of 63 boys in Saskatoon, Canada who were followed from 7 to 16 years of age. Somatotype photos were taken annually and rated by a criterion rater (BH-R). Comparisons were made longitudinally across all years using repeated-measures ANOVAs of the whole somatotype (S), somatotype attitudinal means (SAM), analysis of categories, separate components (endomorphy, mesomorphy, ectomor…
Seasonal height velocity variation in boys and girls 8–18 years
This study investigated the seasonal variation in height velocity during the summer and winter months. The subjects were healthy children, 109 boys and 119 girls, 8.5-18.0 years of age who are part of an ongoing longitudinal study of bone mineral accrual. Anthropometric dimensions were taken twice a year, in the fall in conjunction with the annual bone assessment measures and 6 months later. Six-month velocities for height were calculated, which …
The application of new height-prediction equations (Tanner-Whitehouse mark 2) to a sample of Canadian boys
The adult statures of a sample of 71 Canadian boys from the Saskatchewan Longitudinal Growth Study were predicted using the original TW Mark 1 and the new TW Mark 2 prediction equations. The subjects had a mean chronological age of 11.59 years (SD = 0.30), a mean RUS bone age of 11.62 'years' (SD = 1.18), a mean height of 145.0 cm (SD = 6.98) and a mean measured adult height of 177.2 cm (SD = 6.65). The Mark 2 equations improved the predictions o…
Longitudinal comparison of aerobic power in active and inactive boys aged 7·0 to 17·0 years
Height and maximal aerobic power (VO2 max) were analysed longitudinally in 14 active and 11 inactive boys from the Saskatchewan Longitudinal Growth Study. VO2 max values were obtained from a treadmill run repeated each year. The Preece-Baines Model I was fitted to height and VO2 max values over the duration of the study. No significant differences were found for height attained between the two groups. VO2 max comparisons revealed no significant d…
A Longitudinal Study of the Impact of Childhood and Adolescent Physical Activity Experiences on Adult Physical Activity Perceptions and Behaviors
The authors describe the influence of childhood and adolescent physical activity on adult physical activity attitudes and behaviors. They conducted one-on-one, semistructured, in-depth interviews with 16 men and 15 women from a longitudinal growth and development study and a follow-up investigation 25 years later. They used thematic analyses to analyze the data. Three themes emerged from the men's interviews: significant others, size and maturati…
Longitudinal comparison of aerobic power in active and inactive boys aged 7·0 to 17·0 years
Height and maximal aerobic power (VO2 max) were analysed longitudinally in 14 active and 11 inactive boys from the Saskatchewan Longitudinal Growth Study. VO2 max values were obtained from a treadmill run repeated each year. The Preece-Baines Model I was fitted to height and VO2 max values over the duration of the study. No significant differences were found for height attained between the two groups. VO2 max comparisons revealed no significant d…
The application of new height-prediction equations (Tanner-Whitehouse mark 2) to a sample of Canadian boys
The adult statures of a sample of 71 Canadian boys from the Saskatchewan Longitudinal Growth Study were predicted using the original TW Mark 1 and the new TW Mark 2 prediction equations. The subjects had a mean chronological age of 11.59 years (SD = 0.30), a mean RUS bone age of 11.62 'years' (SD = 1.18), a mean height of 145.0 cm (SD = 6.98) and a mean measured adult height of 177.2 cm (SD = 6.65). The Mark 2 equations improved the predictions o…
Somatotypes of 7- to 16-year-old boys in Saskatchewan, Canada
The purpose of this study was to examine the stability of somatotypes of 63 boys in Saskatoon, Canada who were followed from 7 to 16 years of age. Somatotype photos were taken annually and rated by a criterion rater (BH-R). Comparisons were made longitudinally across all years using repeated-measures ANOVAs of the whole somatotype (S), somatotype attitudinal means (SAM), analysis of categories, separate components (endomorphy, mesomorphy, ectomor…
Somatotypes of 7‐ to 16‐year‐old boys in Saskatchewan, Canada
The purpose of this study was to examine the stability of somatotypes of 63 boys in Saskatoon, Canada who were followed from 7 to 16 years of age. Somatotype photos were taken annually and rated by a criterion rater (BH-R). Comparisons were made longitudinally across all years using repeated-measures ANOVAs of the whole somatotype (S), somatotype attitudinal means (SAM), analysis of categories, separate components (endomorphy, mesomorphy, ectomor…
Seasonal height velocity variation in boys and girls 8–18 years
This study investigated the seasonal variation in height velocity during the summer and winter months. The subjects were healthy children, 109 boys and 119 girls, 8.5-18.0 years of age who are part of an ongoing longitudinal study of bone mineral accrual. Anthropometric dimensions were taken twice a year, in the fall in conjunction with the annual bone assessment measures and 6 months later. Six-month velocities for height were calculated, which …
Timing and magnitude of peak height velocity and peak tissue velocities for early, average, and late maturing boys and girls
Height, weight, and tissue accrual were determined in 60 male and 53 female adolescents measured annually over six years using standard anthropometry and dual-energy X-ray absorptiometry (DXA). Annual velocities were derived, and the ages and magnitudes of peak height and peak tissue velocities were determined using a cubic spline fit to individual data. Individuals were rank ordered on the basis of sex and age at peak height velocity (PHV) and t…
An assessment of maturity from anthropometric measurements
Secular trend in the development of fatness during childhood and adolescence
This study examined the development of fatness, as indexed by skinfold thickness, in healthy Caucasian children and adolescents residing in the same location in Canada in the 1960s and the 1990s. The data comes from two longitudinal studies, conducted approximately 30 years apart, of children aged 8–16 years. The first study (1964–1973) annually measured 207 males and 140 females. The second investigation (1991–1997) repeatedly measured 113 males…
A longitudinal analysis of sex differences in bone mineral accrual in healthy 8-19-year-old boys and girls
Although a statistical significant sex effect is observed, it is less than the error of the measurement, and thus sex difference are debatable. In general, sex difference are explained by anthropometric difference
A Longitudinal Study of the Impact of Childhood and Adolescent Physical Activity Experiences on Adult Physical Activity Perceptions and Behaviors
The authors describe the influence of childhood and adolescent physical activity on adult physical activity attitudes and behaviors. They conducted one-on-one, semistructured, in-depth interviews with 16 men and 15 women from a longitudinal growth and development study and a follow-up investigation 25 years later. They used thematic analyses to analyze the data. Three themes emerged from the men's interviews: significant others, size and maturati…
Limitations to the use of secondary sex characteristics for gender comparisons
Boys and girls differ in the timing and tempo of somatic and sexual maturity. Thus boys and girls should not be aligned on secondary sex characteristics when controlling for the confounding effects of maturity
The influence of dance training on growth and maturation of young females
Results suggest that moderate-high levels of dance training do not affect linear growth and maturation. Thus, girls should not be discouraged from dance participation on the basis of potential growth delays
The relationship between body composition and onset of menarche
Data on 61 girls were retained for analysis. The range in BM, TBF and %BF at menarche was 50.10 kg, 35050.06 g and 31.61%, respectively. Reductions in variability of body fat and weight were not apparent at menarche, which does not provide support for the hypothesis that a critical body weight/fat is required for menarche
Tracking of aerobic fitness from adolescence to mid-adulthood
Aerobic fitness has a low tracking between APHV and adulthood
Patterns of physical performance spurts during adolescence
Data relating physical performance to the timing of the adolescent growth spurt are limited. Aim: This study identifies: (i) age-at-peak height velocity (APHV), (ii) physical performance spurt patterns aligned to APHV; and (iii) cross-cultural and time patterns in Canadian, Brazilian and Portuguese boys. Subjects and methods: A total of 512 boys (131 Canadian, 250 Portuguese and 131 Brazilian), 8-17 years of age were followed serially using longi…
Demography (13 works) · Medicine (12 works) · Demography (8 works) · Anthropometry (6 works) · Internal Medicine (6 works) · Psychology (6 works) · Biology (5 works) · Body Composition Measurement Techniques (5 works) · Mathematics (5 works) · Longitudinal study (4 works)