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Youth maturation

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https://www.readbyqxmd.com/read/29352813/age-at-menarche-and-sexual-debut-among-young-filipino-women
#1
Nai-Peng Tey, Siow-Li Lai, Sor-Tho Ng
There has been a secular decline in age at menarche since the 19th century. Early-maturing women are more likely to have their sexual debut at a younger age, which in turn gives rise to a host of reproductive health and social problems. This study used data from five waves of National Demographic and Health Surveys conducted in the Philippines between 1993 and 2013 to examine the trends and socioeconomic differentials in age at menarche and sexual debut. The changing trend in age at menarche and sexual debut was examined across birth cohorts, and logistic regressions were used to identify the determinants of early sexual debut...
January 21, 2018: Journal of Biosocial Science
https://www.readbyqxmd.com/read/29341246/risk-factors-for-disordered-weight-control-behaviors-among-korean-adolescents-multilevel-analysis-of-the-korea-youth-risk-behavior-survey
#2
Yongjoo Kim, S Bryn Austin, S V Subramanian, Jennifer J Thomas, Kamryn T Eddy, Debra L Franko, Rachel F Rodgers, Ichiro Kawachi
OBJECTIVE: To investigate the prevalence and risk factors for disordered weight control behaviors (DWCB) in South Korean adolescents at multiple levels, including individual, family, school, and geographic area. METHOD: We drew participants from the 11th Korea Youth Risk Behavior Web-based Survey, conducted in 2015, with 65,529 adolescents (31,687 girls, 33,842 boys) aged 12-18 years. DWCB was defined as engaging in any of the following behaviors for weight control over the past month: fasting, one-food diet (eating only one food over an extended period of time for weight control), vomiting, and taking laxatives/diuretics/unprescribed diet pills...
January 17, 2018: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/29339991/multivariate-profiles-of-selected-versus-non-selected-elite-youth-brazilian-soccer-players
#3
Rodrigo Aquino, Isabella S Alves, Maickel B Padilha, Filipe Casanova, Enrico F Puggina, José Maia
This study determined whether a multivariate profile more effectively discriminated selected than non-selected elite youth Brazilian soccer players. This examination was carried out on 66 youth soccer players (selected, n = 28, mean age 16.3 ± 0.1; non-selected, n = 38, mean age 16.7 ± 0.4) using objective instruments. Multivariate profiles were assessed through anthropometric characteristics, biological maturation, tactical-technical skills, and motor performance. The Student's t-test identified that selected players exhibited significantly higher values for height (t = 2...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29336670/does-drug-use-inhibit-crime-deceleration-or-does-crime-inhibit-drug-use-deceleration-a-test-of-the-reciprocal-risk-postulate-of-the-worst-of-both-worlds-hypothesis
#4
Glenn D Walters
BACKGROUND: Prior research has shown that ongoing drug use inhibits the commonly reported maturing out of crime process and that ongoing crime inhibits the commonly reported maturing out of drug use process. OBJECTIVES: To test the predictive efficacy of drug use for crime deceleration and of crime for drug deceleration using a prospective analysis of data on a group of 524 male California Youth Authority parolees to see if both effects exist simultaneously. METHOD: A two-equation regression analysis of Year 3 arrests and illicit drug use was performed, controlling for age, race, marital status, employment status, and number of months free in the community...
January 16, 2018: Substance Use & Misuse
https://www.readbyqxmd.com/read/29331657/views-of-teenage-children-about-the-effects-of-a-parent-s-mobility-disability
#5
Lisa I Iezzoni, Amy J Wint, Alexy Arauz Boudreau, Cheri A Blauwet, Karen A Kuhlthau
BACKGROUND: Few U.S. studies have explored how children experience a parent's mobility disability and its effects on their daily lives. OBJECTIVE: We aimed to engage youth ages 13-17 who had at least one parent with mobility disability in describing their perceptions of their parent's disability and its consequences for their daily and family life. METHODS: Participants videoed and photographed their experiences following general guidelines from the researchers about topics of interest...
December 29, 2017: Disability and Health Journal
https://www.readbyqxmd.com/read/29313111/long-term-swimming-training-modifies-acute-immune-cell-response-to-a-high-intensity-session
#6
José P Morgado, Cristina P Monteiro, Catarina N Matias, Joana F Reis, Júlia Teles, Maria José Laires, Francisco Alves
PURPOSE: Long-term training influence on athletes' immune cell response to acute exercise has been poorly studied, despite the complexity of both chronic and acute adaptations induced by training. The purpose of the study is to study the influence of a 4-month swimming training cycle on the immune cell response to a high-intensity training session, during 24 h of recovery, considering sex, maturity, and age group. METHODS: Forty-three swimmers (16 females, 14.4 ± 1...
January 8, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29278774/data-driven-assessment-of-structural-image-quality
#7
Adon F G Rosen, David R Roalf, Kosha Ruparel, Jason Blake, Kevin Seelaus, Lakshmi P Villa, Rastko Ciric, Philip A Cook, Christos Davatzikos, Mark A Elliott, Angel Garcia de La Garza, Efstathios D Gennatas, Megan Quarmley, J Eric Schmitt, Russell T Shinohara, M Dylan Tisdall, R Cameron Craddock, Raquel E Gur, Ruben C Gur, Theodore D Satterthwaite
Data quality is increasingly recognized as one of the most important confounding factors in brain imaging research. It is particularly important for studies of brain development, where age is systematically related to in-scanner motion and data quality. Prior work has demonstrated that in-scanner head motion biases estimates of structural neuroimaging measures. However, objective measures of data quality are not available for most structural brain images. Here we sought to identify quantitative measures of data quality for T1-weighted volumes, describe how such measures of quality relate to cortical thickness, and delineate how this in turn may bias inference regarding associations with age in youth...
December 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/29276855/assessing-differences-in-cardiorespiratory-fitness-with-respect-to-maturity-status-in-highly-trained-youth-soccer-players
#8
Greg Doncaster, John Iga, Viswanath Unnithan
PURPOSE: The purpose of the study was to examine differences in measures of cardiorespiratory fitness and determinants of running economy with respect to maturity status in a group of highly trained youth soccer players. METHODS: A total of 21 highly trained youth soccer players participated in this study. On separate visits, players' peak oxygen uptake (VO2peak), running economy at 3 different speeds [8 km·h-1, 80% gaseous exchange threshold (GET), and 95% GET], and pulmonary oxygen uptake (VO2) kinetics were determined...
December 23, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29273844/attitudes-perceptions-and-use-of-marijuana-in-youth-with-multiple-sclerosis
#9
J Nicholas Brenton, Teri Schreiner, Krystle Karoscik, Meg Richter, Samantha Ferrante, Amy Waldman, Brenda Banwell
BACKGROUND: Studies have shown a negative impact on cognition and brain volume in marijuana-using adult multiple sclerosis (MS) patients and healthy adolescents. Given that onset of MS during childhood and adolescence negatively impacts brain growth and the normal maturation of neuronal networks, the addition of marijuana exposure in these youth may be even more harmful. OBJECTIVE: Determine attitudes toward and prevalence of recreational marijuana use in MS youth...
December 22, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/29249987/imbalances-in-the-development-of-muscle-and-tendon-as-risk-factor-for-tendinopathies-in-youth-athletes-a-review-of-current-evidence-and-concepts-of-prevention
#10
REVIEW
Falk Mersmann, Sebastian Bohm, Adamantios Arampatzis
Tendons feature the crucial role to transmit the forces exerted by the muscles to the skeleton. Thus, an increase of the force generating capacity of a muscle needs to go in line with a corresponding modulation of the mechanical properties of the associated tendon to avoid potential harm to the integrity of the tendinous tissue. However, as summarized in the present narrative review, muscle and tendon differ with regard to both the time course of adaptation to mechanical loading as well as the responsiveness to certain types of mechanical stimulation...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29241653/synaptic-adaptations-to-chronic-ethanol-intake-in-male-rhesus-monkey-dorsal-striatum-depend-on-age-of-drinking-onset
#11
Verginia C Cuzon Carlson, Kathleen A Grant, David M Lovinger
One in 12 adults suffer with alcohol use disorder (AUD). Studies suggest the younger the age in which alcohol consumption begins the higher the probability of being diagnosed with AUD. Binge/excessive alcohol drinking involves a transition from flexible to inflexible behavior likely involving the dorsal striatum (caudate and putamen nuclei). A major focus of this study was to examine the effect of age of drinking onset on subsequent chronic, voluntary ethanol intake and dorsal striatal circuitry. Data from rhesus monkeys (n = 45) that started drinking as adolescents, young adults or mature adults confirms an age-related risk for heavy drinking...
December 12, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29231956/gender-diversity-sexual-orientation-and-bone-health-in-the-maturing-dancer
#12
REVIEW
Derrick D Brown
Gender identity forms an important aspect of still developing youths. Gender is traditionally classified into two distinct categories, female and male. Transgender is a general term that describes individuals who self-identity as male, female, both, or neither (i.e., gender fluid) and do not match the assigned at-birth gender. Adolescent transgender individuals are currently a marginal population. There are limited demographics on youths, but as of 2014 an estimate of 1.4 million adults in the USA identified as transgender...
December 2017: Medical Problems of Performing Artists
https://www.readbyqxmd.com/read/29229776/positive-charge-in-the-n-region-of-the-signal-peptide-contributes-to-efficient-post-translational-translocation-of-small-secretory-preproteins
#13
Huan Guo, Jinhong Sun, Xin Li, Yi Xiong, Heting Wang, Hua Shu, Ruimin Zhu, Qi Liu, Yumeng Huang, Rachel Madley, Yulun Wang, Jingqiu Cui, Peter Arvan, Ming Liu
Increasing evidence indicates that many small secretory preproteins can undergo post-translational translocation across the membrane of the endoplasmic reticulum (ER). Although the cellular machinery involved in post-translational translocation of small secretory preproteins has begun to be elucidated, the intrinsic signals contained within these small secretory preproteins that contribute to their efficient post-translational translocation remain unknown. Here, we analyzed the eukaryotic secretory proteome and discovered that it contains an increased percentage of small secretory preproteins with a positive charge in the n-region of the signal peptide (SP)...
December 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29225386/-i-don-t-want-to-grow-up-i-m-a-gen-x-y-me-kid-increasing-maturity-fears-across-the-decades
#14
April R Smith, Lindsay P Bodell, Jill Holm-Denoma, Thomas E Joiner, Kathryn H Gordon, Marisol Perez, Pamela K Keel
The current studies examined the hypothesis that maturity fears are increasing among undergraduate men and women from the United States over time. Study 1 used a time-lag method to assess generational effects of maturity fears among a large sample (n = 3,291) of undergraduate men and women assessed in 1982, 1992, 2002, and 2012. Results revealed that both men and women reported significantly higher rates of maturity fears across time. Study 2 replicated these findings, and used a more restricted time frame to more closely examine the rate of change...
November 2017: International Journal of Behavioral Development
https://www.readbyqxmd.com/read/29214820/weight-management-behaviors-among-mexican-american-youth-cross-sectional-variation-by-timing-of-growth-and-maturation
#15
Jennifer L Gay, Eva V Monsma, Katie Darby Hein
PURPOSE: To assess the association between growth and maturation with weight management behaviors (WMBs) among Mexican American youth. DESIGN: A cross-sectional design was used to measure timing of growth and maturation as well as WMBs. SAMPLE: Students were recruited through physical education classes in south Texas schools. The sample included 623 participants (52.3% female; 49.8% with weight ≥85th percentile) in grades 4 through 12. Students in middle school were purposely oversampled to examine questions around timing of growth and maturation...
January 1, 2017: American Journal of Health Promotion: AJHP
https://www.readbyqxmd.com/read/29194185/does-maturity-status-affect-the-relationship-between-anaerobic-speed-reserve-and-multiple-sprints-sets-performance-in-young-soccer-players
#16
Mohamed Amin Selmi, Badriya Al-Haddabi, Mohamed Haj Yahmed, Radhouane Haj Sassi
The purpose of this study is to examine the relationship between repeated-sprint sets (RSS) performance indices and anaerobic speed reserve (ASR) in young soccer players of different maturity status. One hundred and seventy nine young male soccer players (11.1 to 17.8 years) classified as pre- (n=50), circum- (n=60), or post- (n=69) peak height velocity (PHV) performed multi-stage shuttle run test (MRST) to measure maximal aerobic speed (MAS), 30-m sprint with 10-m splits to estimate maximal anaerobic speed (MAnS), and RSS test...
November 29, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29175806/the-distribution-of-different-types-of-diabetes-in-childhood-a-single-center-experience
#17
Belma Haliloğlu, Saygın Abali, Fuat Buğrul, Enes Çelik, Serpil Baş, Zeynep Atay, Tülay Güran, Serap Turan, Abdullah Bereket
OBJECTIVE: Type 1 diabetes (T1D) is the most common cause of diabetes in childhood but type 2 diabetes (T2D) and maturity onset diabetes of the young (MODY) are emerging and noteworthy causes of diabetes in youths. The aim of the study is to determine the distribution, trends and clinical features of the different types of diabetes in childhood in a tertiary single-center. METHODS: Children and adolescents aged 0-18 years who were diagnosed "diabetes/persistent hyperglycemia" between January 1999 and December 2016, were reviewed...
November 24, 2017: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/29169998/interaction-between-drd2-and-lead-exposure-on-the-cortical-thickness-of-the-frontal-lobe-in-youth-with-attention-deficit-hyperactivity-disorder
#18
Johanna Inhyang Kim, Jae-Won Kim, Jong-Min Lee, Hyuk Jin Yun, Chul-Ho Sohn, Min-Sup Shin, Bongseog Kim, Jonghee Chae, Jaewoo Roh, Bung-Nyun Kim
BACKGROUND: The dopamine receptor D2 receptor (DRD2) gene and lead exposure are both thought to contribute to the pathophysiology of attention-deficit/hyperactivity disorder (ADHD). ADHD is characterized by delay in brain maturation, most prominent in the prefrontal cortex (PFC). The D2 receptor is also mainly located in the PFC, and animal studies show that lead exposure affects the dopaminergic system of the frontal lobe, indicating an overlap in neural correlates of ADHD, DRD2, and lead exposure...
November 20, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29146566/improving-transition-to-employment-for-youth-with-physical-disabilities-protocol-for-a-peer-electronic-mentoring-intervention
#19
Sally Lindsay, Jennifer Stinson, Mary Stergiou-Kita, Joanne Leck
BACKGROUND: Although youth with disabilities have much to gain from employment readiness programs, they are often excluded from or have limited access to vocational programs. One encouraging approach to address gaps in vocational programming is through peer electronic mentoring (e-mentoring), which may facilitate a smoother transition to adulthood by offering support to enhance coping skills. Despite the increase in online communities, little is known about their impact on vocational mentoring for youth with physical disabilities and their parents...
November 16, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/29144964/biocultural-approach-of-the-association-between-maturity-and-physical-activity-in-youth
#20
André O Werneck, Danilo R P Silva, Paul Collings, Rômulo A Fernandes, Enio R V Ronque, Manuel J Coelho-E-Silva, Luís B Sardinha, Edilson S Cyrino
OBJECTIVE: To test the biocultural model through direct and indirect associations between biological maturation, adiposity, cardiorespiratory fitness, sadness, social relationships, and physical activity in adolescents. METHODS: This was a cross-sectional study conducted with 1152 Brazilian adolescents aged between 10 and 17 years. Somatic maturation was estimated through Mirwald's method (peak height velocity). Physical activity was assessed through Baecke questionnaire (occupational, leisure, and sport contexts)...
November 13, 2017: Jornal de Pediatria
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