Erlingur Jóhannsson
Dados Biográficos
| ID | 6950716 |
|---|---|
| NOME | Erlingur Jóhannsson |
| PRENOMES | Erlingur |
| SOBRENOME | Jóhannsson |
| ASSINATURA | JOHANNSSON E |
| AFILIAÇÕES | University of Iceland |
| ORCID | 0000-0002-8028-7851 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 12 |
| TOTAL DE CITAÇÕES | 0 |
| TOTAL COMO AUTOR | 12 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2010 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 0 |
Player ranking is associated with physical performance and body composition in 12-year-old female soccer players
Background The relative contribution of biological maturation and body composition to performance in youth female soccer remains unclear. This study compared skeletal maturity, body composition, and physical performance across ranking groups in 12-year-old female players within a community club system. Methods Eighty-eight players (11.9 ± 0.3 years) completed bone age (BA) assessment from non-dominant wrist radiographs, DXA body composition testi…
The relationship between online communication and mental health and cardiorespiratory fitness from ages 15 to 17
This study underscores the potential negative effects of online communication on mental and physical health among adolescents, regardless of sex or SES. The findings highlight the importance of balancing time spent online communicating with physical activity to support overall adolescent well-being. These insights could inform public health initiatives and preventive strategies to foster healthier digital habits in an increasingly online world, e…
Asymmetries in lean mass, balance, and stability in 12-year-old female soccer (football) players
Background Physical asymmetries in soccer (football) are inconsistently reported, and data on female youth players remain limited. This study evaluated asymmetries in leg lean mass, dynamic balance, landing kinetics and postural stability among 12-year-old female soccer players. Methods Eighty-five players from 10 football clubs in Reykjavik, Iceland, participated between April and June 2024. Leg lean mass was assessed via dual-energy x-ray absor…
Norwegian male U14 soccer players have superior running capacity compared to Icelandic players
The organisation and development strategies of youth soccer differ between Norway and Iceland. Whether this affect physical capacity is unknown. Thus, the first aim of the present study is to compare physical capacity between players from Iceland and Norway. Secondary aim is to assess associations between biological maturity and physical capacity in the Icelandic players since an association previously has been shown among the Norwegians. There w…
Screen Time and Body Image in Icelandic Adolescents
Studies of adolescent body image and screen use are mostly limited to girls, and longitudinal data are scarce. We examined cross-sectional and longitudinal associations between these variables in mid-adolescent boys and girls. Data was collected when participants were at age 15 and 17, by questionnaire and objective measurements ( n = 152 had complete data). Sex-specific linear regression was used to explore cross-sectional and longitudinal assoc…
Organized Sport Participation, Physical Activity, Sleep and Screen Time in 16-Year-Old Adolescents
This study aimed to examine the association of different frequencies of organized sport participation (OSP) with physical activity, cardiorespiratory fitness, body composition, sleep, and screen time among adolescents. A cross-sectional study involving 315 16-year-old adolescents was conducted. OSP was self-reported, being categorized as 0 times a week, less than three times a week, 4-5 times a week, and 6-7 times a week, on average. Screen time …
Serum 25-hydroxyvitamin D concentrations in 16-year-old Icelandic adolescent and its association with bone mineral density
Objective: The aim of the study was to assess the potential association between serum 25-hydroxyvitamin D (25(OH)D) and whole-body bone mineral density (BMD) among 16-year-old adolescents and to study the prevalence of 25(OH)D insufficiency, defined as concentration under 50 nmol/l. Design: A cross-sectional study. Setting: Reykjavik, Iceland, latitude 64°08′N. Measurements took place in the Icelandic Heart Association's research lab during April…
Comparison of Summer and Winter Objectively Measured Physical Activity and Sedentary Behavior in Older Adults
In Iceland, there is a large variation in daylight between summer and winter. The aim of the study was to identify how this large variation influences physical activity (PA) and sedentary behavior (SB). Free living PA was measured by a waist-worn accelerometer for one week during waking hours in 138 community-dwelling older adults (61.1% women, 80.3 ± 4.9 years) during summer and winter months. In general, SB occupied about 75% of the registered …
Importance of physical health and health-behaviors in adolescence for risk of dropout from secondary education in young adulthood
Completion of a secondary education yields substantial physical health benefits for young women, but not for men. Importantly, somatic complaints and negative health-behaviors among adolescent boys and girls adversely impact their educational outcomes later in life, and may have widespread consequences for their future prospects
Insufficient autumn vitamin D intake and low vitamin D status in 7-year-old Icelandic children
Objective The aim was to investigate autumn vitamin D intake and status in 7-year-old Icelanders, fitting BMI and cardiorespiratory fitness as predictors. Design Three-day food records and fasting blood samples were collected evenly from September to November, and cardiorespiratory fitness was measured with an ergometer bike. Food and nutrient intakes were calculated, and serum 25-hydroxyvitamin D (s-25(OH)D) and serum parathyroid hormone were an…
The association of cardiorespiratory fitness to health independent of adiposity depends upon its expression
CRFFFM, where adiposity has been removed, is associated with metabolic risk factors, whereas CRF, which is related to adiposity, is not after adjustment for fatness. Previously, independent effects of CRF on health may have been underestimated by using an expression of CRF strongly related to the adiposity measures
Effects of a school-based intervention on adherence of 7–9-year-olds to food-based dietary guidelines and intake of nutrients
Objective To assess the effects of a school-based intervention on the diets of 7–9-year-olds. Design Dietary intake of children in second and fourth grades was assessed with 3d weighed dietary records in autumn 2006 and autumn 2008, before and after a school-based intervention that started in the middle of second grade, and compared with control schools with no intervention. The diet was evaluated by comparison with food-based dietary guidelines …
Sem obras proeminentes nesta página.
Effects of a school-based intervention on adherence of 7–9-year-olds to food-based dietary guidelines and intake of nutrients
Objective To assess the effects of a school-based intervention on the diets of 7–9-year-olds. Design Dietary intake of children in second and fourth grades was assessed with 3d weighed dietary records in autumn 2006 and autumn 2008, before and after a school-based intervention that started in the middle of second grade, and compared with control schools with no intervention. The diet was evaluated by comparison with food-based dietary guidelines …
Importance of physical health and health-behaviors in adolescence for risk of dropout from secondary education in young adulthood
Completion of a secondary education yields substantial physical health benefits for young women, but not for men. Importantly, somatic complaints and negative health-behaviors among adolescent boys and girls adversely impact their educational outcomes later in life, and may have widespread consequences for their future prospects
Insufficient autumn vitamin D intake and low vitamin D status in 7-year-old Icelandic children
Objective The aim was to investigate autumn vitamin D intake and status in 7-year-old Icelanders, fitting BMI and cardiorespiratory fitness as predictors. Design Three-day food records and fasting blood samples were collected evenly from September to November, and cardiorespiratory fitness was measured with an ergometer bike. Food and nutrient intakes were calculated, and serum 25-hydroxyvitamin D (s-25(OH)D) and serum parathyroid hormone were an…
The association of cardiorespiratory fitness to health independent of adiposity depends upon its expression
CRFFFM, where adiposity has been removed, is associated with metabolic risk factors, whereas CRF, which is related to adiposity, is not after adjustment for fatness. Previously, independent effects of CRF on health may have been underestimated by using an expression of CRF strongly related to the adiposity measures
Comparison of Summer and Winter Objectively Measured Physical Activity and Sedentary Behavior in Older Adults
In Iceland, there is a large variation in daylight between summer and winter. The aim of the study was to identify how this large variation influences physical activity (PA) and sedentary behavior (SB). Free living PA was measured by a waist-worn accelerometer for one week during waking hours in 138 community-dwelling older adults (61.1% women, 80.3 ± 4.9 years) during summer and winter months. In general, SB occupied about 75% of the registered …
Serum 25-hydroxyvitamin D concentrations in 16-year-old Icelandic adolescent and its association with bone mineral density
Objective: The aim of the study was to assess the potential association between serum 25-hydroxyvitamin D (25(OH)D) and whole-body bone mineral density (BMD) among 16-year-old adolescents and to study the prevalence of 25(OH)D insufficiency, defined as concentration under 50 nmol/l. Design: A cross-sectional study. Setting: Reykjavik, Iceland, latitude 64°08′N. Measurements took place in the Icelandic Heart Association's research lab during April…
Organized Sport Participation, Physical Activity, Sleep and Screen Time in 16-Year-Old Adolescents
This study aimed to examine the association of different frequencies of organized sport participation (OSP) with physical activity, cardiorespiratory fitness, body composition, sleep, and screen time among adolescents. A cross-sectional study involving 315 16-year-old adolescents was conducted. OSP was self-reported, being categorized as 0 times a week, less than three times a week, 4-5 times a week, and 6-7 times a week, on average. Screen time …
Screen Time and Body Image in Icelandic Adolescents
Studies of adolescent body image and screen use are mostly limited to girls, and longitudinal data are scarce. We examined cross-sectional and longitudinal associations between these variables in mid-adolescent boys and girls. Data was collected when participants were at age 15 and 17, by questionnaire and objective measurements ( n = 152 had complete data). Sex-specific linear regression was used to explore cross-sectional and longitudinal assoc…
Norwegian male U14 soccer players have superior running capacity compared to Icelandic players
The organisation and development strategies of youth soccer differ between Norway and Iceland. Whether this affect physical capacity is unknown. Thus, the first aim of the present study is to compare physical capacity between players from Iceland and Norway. Secondary aim is to assess associations between biological maturity and physical capacity in the Icelandic players since an association previously has been shown among the Norwegians. There w…
The relationship between online communication and mental health and cardiorespiratory fitness from ages 15 to 17
This study underscores the potential negative effects of online communication on mental and physical health among adolescents, regardless of sex or SES. The findings highlight the importance of balancing time spent online communicating with physical activity to support overall adolescent well-being. These insights could inform public health initiatives and preventive strategies to foster healthier digital habits in an increasingly online world, e…
Asymmetries in lean mass, balance, and stability in 12-year-old female soccer (football) players
Background Physical asymmetries in soccer (football) are inconsistently reported, and data on female youth players remain limited. This study evaluated asymmetries in leg lean mass, dynamic balance, landing kinetics and postural stability among 12-year-old female soccer players. Methods Eighty-five players from 10 football clubs in Reykjavik, Iceland, participated between April and June 2024. Leg lean mass was assessed via dual-energy x-ray absor…
Player ranking is associated with physical performance and body composition in 12-year-old female soccer players
Background The relative contribution of biological maturation and body composition to performance in youth female soccer remains unclear. This study compared skeletal maturity, body composition, and physical performance across ranking groups in 12-year-old female players within a community club system. Methods Eighty-eight players (11.9 ± 0.3 years) completed bone age (BA) assessment from non-dominant wrist radiographs, DXA body composition testi…
Medicine (10 obras) · Internal Medicine (8 obras) · Obesity, Physical Activity, Diet (6 obras) · Biology (5 obras) · Demography (5 obras) · Demography (5 obras) · Gerontology (5 obras) · Physical therapy (5 obras) · Psychology (5 obras) · Cardiorespiratory fitness (4 obras)