David B Allen

University of Wisconsin–Madison, Madison, Wisconsin, United States

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Publications (111)671.81 Total impact

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    ABSTRACT: Hispanic children are disproportionally affected by obesity-related risk of metabolic disease. We used the structural equation modeling to examine the associations between specific diet and physical activity (PA) behaviors at home and Hispanic children’s metabolic health. A total of 187 Hispanic children and their parents from an urban community in Wisconsin participated in the study. Exposure variables included, children’s daily intake of sugar-sweetened beverages (SSB) and PA; home availability of SSB and PA areas/equipment; and parents’ intake of SSB and PA, assessed through self-administered questionnaires. Outcome variables for children’s metabolic health included, measured anthropometrics; cardiovascular fitness assessed using the Progressive Aerobic Cardiovascular Endurance Run (PACER); and insulin resistance determined with the homeostasis model assessment of insulin resistance (HOMAIR). We found that children’s daily intake of SSB was positively associated with BMI z-score, which in turn, was positively associated with HOMAIR (P<0.05). Specific diet behaviors at home associated with children’s intake of SSB, included home availability of SSB, which mediated the association between parents’ and children’s intake of SSB (P<0.05). Children’s PA was positively associated with PACER z-score, which in turn, was inversely associated with HOMAIR (P<0.05). Specific PA behaviors at home associated with children’s PA, included home availability of PA areas/equipment, which mediated the association between parents’ and children’s PA (P<0.05).The structural equation model indices suggested a satisfactory model fit (Chi-square, X2 =53.1, comparative fix index=0.92, root-mean-squared error associated=0.04). The findings confirm the need for interventions at the family level that promotes healthier home environments by targeting poor diet and low levels of PA in all family members.
    No preview · Article · Feb 2016 · Appetite
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    ABSTRACT: Inhaled corticosteroids (ICSs) are widely used as first-line treatment for various chronic respiratory illnesses. Advances in devices and formulations have reduced their local adverse effects. However, as delivery of ICSs to the lungs improves, the systemic absorption increases, and an adverse effect profile similar to, although milder than, oral corticosteroids has emerged. The most serious potential adverse effect is adrenal insufficiency, which can be life threatening. Adrenal insufficiency occurs most in patients taking the highest doses of ICSs but is reported with moderate or even low doses as well. Our recommendations include greater vigilance in testing adrenal function than current standard practice. In patients with diabetes mellitus (types 1 and 2), an increase in glucose levels is likely, and diabetes medication adjustment may be needed when initiating or increasing ICSs. The risk of linear growth attenuation and adverse effects on bone mineral density is generally low but should be considered in the face of additional risk factors. On behalf of the Pediatric Endocrine Society Drugs and Therapeutics Committee, we present a review of the endocrine adverse effects of ICSs in children and offer recommendations relating to testing and referral. Limited data in particular realms diminish the strength of certain recommendations, and clinical judgment continues to be paramount.
    No preview · Article · Dec 2015
  • Peter M. Wolfgram · David B. Allen

    No preview · Article · Dec 2015 · The Journal of allergy and clinical immunology
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    ABSTRACT: Recombinant human growth hormone (rhGH) has been in use for 30 years, and over that time its safety and efficacy in children and adults has been subject to considerable scrutiny. In 2001, a statement from the GH Research Society (GRS) concluded that 'for approved indications, GH is safe'; however, the statement highlighted a number of areas for on-going surveillance of long-term safety including; cancer risk, impact on glucose homeostasis and use of high dose pharmacological rhGH treatment. Over the intervening years, there have been a number of publications addressing the safety of rhGH with regard to mortality, cancer and cardiovascular risk and the need for longterm surveillance of the increasing number of adults who were treated with rhGH in childhood. Against this backdrop of interest in safety, the European Society of Paediatric Endocrinology (ESPE), the GRS and the Pediatric Endocrine Society (PES) convened a meeting to reappraise the safety of rhGH. The ouput of the meeting is a concise position statement.
    Full-text · Article · Nov 2015 · European Journal of Endocrinology
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    ABSTRACT: Objective: The aim of this study was to investigate the degree to which waist circumference (WC), body mass index (BMI), and magnetic resonance imaging (MRI)-measured abdominal fat deposition predict insulin resistance (IR) in nonobese girls of diverse racial and ethnic backgrounds. Methods: Fifty-seven nonobese girls (12 African-American, 16 Hispanic White, and 29 non-Hispanic White girls) aged 11-14 years were assessed for WC, MRI hepatic proton density fat fraction, visceral and subcutaneous adipose tissue volume, BMI Z-score, fasting insulin, homeostasis model of assessment (HOMA)-IR, adiponectin, leptin, sex hormone-binding globulin, high-density lipoprotein cholesterol, and triglycerides. Results: Univariate and multivariate analyses adjusted for race and ethnicity indicated that only WC and visceral adipose tissue volume were independent predictors of fasting insulin and HOMA-IR, while hepatic proton density fat fraction, BMI Z-score, and subcutaneous adipose tissue volume were dependent predictors. Hispanic White girls showed significantly higher mean fasting insulin and HOMA-IR and lower sex hormone-binding globulin than non-Hispanic White girls (p < 0.01). Conclusions: In nonobese girls of diverse racial and ethnic backgrounds, WC, particularly when adjusted for race or ethnicity, is an independent predictor of IR comparable to MRI-derived measurements of fat and superior to the BMI Z-score.
    No preview · Article · Sep 2015 · Hormone Research in Paediatrics
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    Allison J Pollock · Norman Fost · David B Allen

    Full-text · Article · Jul 2015 · Archives of Disease in Childhood
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    ABSTRACT: To compare complex quantitative magnetic resonance imaging (MRI) with MR spectroscopy (MRS) for quantification of hepatic steatosis (HS) and determine clinically significant MRI-based thresholds of HS in female youths. This prospective, cross-sectional study was conducted in 132 healthy females (11-22 years, mean 13.3 ± 2). Proton density fat-fraction (PDFF) was measured using complex quantitative MRI and MRS. Body mass index (BMI), fasting labs [glucose, insulin, alanine aminotransferase (ALT), and other metabolic markers] were obtained. Outcomes were measured using regression analysis, Spearman-rank correlation, and receiver operator characteristics (ROC) analysis. HS was defined as MRI-PDFF >5.6 %. HS was detected by MRI-PDFF in 15 % of all subjects. Linear regression demonstrated excellent correlation and agreement [r(2) = 0.96, slope = 0.97 (95 %CI: 0.94-1.00), intercept = 0.78 % (95 %CI: 0.58-0.98 %)] between MRI-PDFF and MRS-PDFF. MRI-PDFF had a sensitivity of 100 % (95 %CI: 0.79-1.00), specificity of 96.6 % (95 %CI: 0.91-0.99), and a kappa index of 87 % (95 %CI: 0.75-0.99) for identifying HS. In overweight subjects with HS, MRI-PDFF correlated with ALT (r = 0.84, p < 0.0001) and insulin (r = 0.833, p < 0.001), but not with BMI or WC. ROC analysis ascertained an optimal MRI-PDFF threshold of 3.5 % for predicting metabolic syndrome (sensitivity = 76 %, specificity = 83 %). Complex quantitative MRI demonstrates strong correlation and agreement with MRS to quantify hepatic triglyceride content in adolescent girls and young women. A low PDFF threshold is predictive of metabolic syndrome in this population. • Confounder-corrected quantitative MRI (ccqMRI) effectively measures hepatic triglyceride content in adolescent girls. • MRS and ccqMRI strongly correlate in liver proton density fat-fraction (PDFF) detection. • A PDFF threshold of 3.5 % may be predictive of paediatric metabolic syndrome.
    No preview · Article · Apr 2015 · European Radiology
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    ABSTRACT: Urban environments can increase risk for development of obesity, insulin resistance (IR), and type 2 diabetes mellitus (T2DM) by limiting physical activity. This study examined, in a cohort of urban Hispanic youth, the relationship between daily physical activity (PA) measured by GPS, insulin resistance and cardiovascular fitness. Hispanic middle school children (n = 141) were assessed for body mass index (BMI), IR (homeostasis model [HOMA-IR]), cardiovascular fitness (progressive aerobic cardiovascular endurance run [PACER]). PA was measured (GPS-PA) and energy expenditure estimated (GPS-EE) utilizing a global positioning mapping device worn for up to 7 days. Students (mean age 12.7 ± 1.2 years, 52% female) spent 98% of waking time in sedentary activities, 1.7% in moderate intensity PA, and 0.3% in vigorous intensity. GPS analysis revealed extremely low amounts of physical movement during waking hours. The degree of low PA confounded correlation analysis with PACER or HOMA-IR. Levels of moderate and vigorous intensity PA, measured by GPS, were extremely low in these urban Hispanic youth, possibly contributing to high rates of obesity and IR. Physical movement patterns suggest barriers to PA in play options near home, transportation to school, and in school recess time. GPS technology can objectively and accurately evaluate initiatives designed to reduce obesity and its morbidities by increasing PA.
    Preview · Article · Dec 2014 · International Journal of Pediatric Endocrinology
  • David B. Allen

    No preview · Article · Nov 2014 · Journal of Pediatrics
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    ABSTRACT: Objective: To develop a risk assessment model for early detection of hepatic steatosis using common anthropometric and metabolic markers. Study design: This was a cross-sectional study of 134 adolescent and young adult females, age 11-22 years (mean 13.3±2 years) from a middle school and clinics in Madison, Wisconsin. The ethnic distribution was 27% Hispanic and 73% non-Hispanic; the racial distribution was 64% Caucasian, 31% African-American, and 5% Asian, Fasting glucose, fasting insulin, alanine aminotransferase (ALT), body mass index (BMI), waist circumference (WC), and other metabolic markers were assessed. Hepatic fat was quantified using magnetic resonance imaging proton density fat fraction (MR-PDFF). Hepatic steatosis was defined as MR-PDFF>5.5%. Outcome measures were sensitivity, specificity, and positive predictive value (PPV) of BMI, WC, ALT, fasting insulin, and ethnicity as predictors of hepatic steatosis, individually and combined, in a risk assessment model. Classification and regression tree methodology was used to construct a decision tree for predicting hepatic steatosis. Results: MR-PDFF revealed hepatic steatosis in 16% of subjects (27% overweight, 3% nonoverweight). Hispanic ethnicity conferred an OR of 4.26 (95% CI, 1.65-11.04; P=.003) for hepatic steatosis. BMI and ALT did not independently predict hepatic steatosis. A BMI>85% combined with ALT>65 U/L had 9% sensitivity, 100% specificity, and 100% PPV. Lowering the ALT value to 24 U/L increased the sensitivity to 68%, but reduced the PPV to 47%. A risk assessment model incorporating fasting insulin, total cholesterol, WC, and ethnicity increased sensitivity to 64%, specificity to 99% and PPV to 93%. Conclusion: A risk assessment model can increase specificity, sensitivity, and PPV for identifying the risk of hepatic steatosis and guide the efficient use of biopsy or imaging for early detection and intervention.
    No preview · Article · May 2014 · Journal of Pediatrics

  • No preview · Article · Apr 2014 · Journal of Pediatric and Adolescent Gynecology
  • Tasa S Seibert · David B Allen · Aaron L Carrel
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    ABSTRACT: Objective: To provide information that will assist clinicians in assessing and addressing risk for obesity-related comorbidities in adolescents. Methods: Review of the literature. Results: Childhood obesity is a major public health concern. Prevention of obesity or early detection of its health consequences are important responsibilities or opportunities for primary care clinicians. While body mass index (BMI) screening is valuable, insulin resistance and other obesity-related comorbidities can develop even when BMI falls below the 95th percentile threshold for obesity. Detailed history and physical examination can help identify comorbidities and guide diagnostic evaluation. Referral to multidisciplinary clinics specializing in childhood obesity is warranted when obesity is particularly severe, comorbidities are present at baseline, or no improvement is noted after 6 months of intense lifestyle intervention. Conclusion: For optimal health outcomes, management of adolescent obesity and associated comorbidities is should be adapted based on an individual's overall risk rather than BMI alone.
    No preview · Article · Feb 2014 · Journal of clinical outcomes management: JCOM
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    ABSTRACT: Objective: In nonobese youth, to investigate whether hepatic fat deposition and its metabolic consequences vary between ethnic groups. Design and methods: Thirty-two nonobese girls (12 Hispanic White [H] and 20 non-Hispanic White [NHW] girls), aged 11-14 years old were recruited. Outcome measures were MRI measured hepatic proton density fat fraction (hepatic PDFF), BMI Z-score, waist circumference, fasting insulin, glucose, adiponectin, sex hormone-binding globulin [SHBG], ALT, AST, triglycerides, and HOMA-IR. Results: There were no significant differences in mean BMI Z-scores (P = 0.546) or hepatic PDFF (P = 0.275) between H and NHW girls; however, H girls showed significant correlations between hepatic PDFF and markers of IR (fasting insulin, HOMA-IR, adiponectin, SHBG, triglycerides; all P < 0.05), while NHW girls showed no significant correlations. Matched by hepatic PDFF or BMI Z-score, H girls had more evidence of IR for a given hepatic PDFF (mean insulin, HOMA-IR, and SHBG; all P < 0.05) or BMI Z-score (mean insulin and HOMA-IR; all P < 0.01) than NHW girls. Conclusions: In nonobese female youth, ethnicity-related differences in effects of hepatic fat on IR are evident, so that in H girls, a given amount of hepatic fat appears to result in a more predictable and greater degree of IR than in NHW girls.
    Preview · Article · Jan 2014 · Obesity
  • Peter M Wolfgram · Aaron L Carrel · David B Allen
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    ABSTRACT: Purpose of review: Recombinant human growth hormone (hGH) therapy in children with Prader-Willi syndrome (PWS) improves linear growth, body composition, physical strength and agility, and other metabolic parameters. These benefits must be weighed against potential adverse effects, including rare occurrences of sudden death. This review summarizes recent evidence important to a benefit-risk analysis of hGH use in children with PWS. Recent findings: Studies consistently show that hGH improves stature, body composition, fat percentage and distribution, and other metabolic markers in children with PWS. Preliminary reports of improved cognitive development during hGH have also emerged. Scoliosis progression is influenced by growth rate, but frequency of occurrence and severity are not increased by hGH exposure. PWS genotype does not appear to affect response to hGH. Concerns about hGH-associated sudden death persist, but recent studies show either absence of change in sleep-disordered breathing or improved sleep cardiovascular function during hGH therapy. Summary: Recent studies confirm and expand reported benefits of hGH therapy in children with PWS, including a possible salutary role in cognitive development. These findings support previous assertions that hGH can reduce morbidity and improve function in children with PWS, and suggest that potential risks of such treatment are favorably balanced by its benefits.
    No preview · Article · Jun 2013 · Current opinion in pediatrics
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    ABSTRACT: Context:rhGH therapy in Prader-Willi syndrome (PWS) has been used by the medical community and advocated by parental support groups since its approval in the US in 2000 and in Europe in 2001. Its use in PWS represents a unique therapeutic challenge which includes treating individuals with cognitive disability, varied therapeutic goals that are not focused exclusively on increased height, and concerns about potential life-threatening adverse events.Objective:To formulate recommendations for the use of rhGH in children and adult patients with PWS.Evidence:A systematic review of the clinical evidence in the pediatric population, including randomized controlled trials (RCTs), comparative observational studies and long term studies (>3.5 years). Adult studies included RCTs of rhGH treatment for [mteq] 6 months and uncontrolled trials. Safety data were obtained from case reports, clinical trials and pharmaceutical registries.Methodology:Forty-three international experts and stakeholders followed clinical practice guideline development recommendations outlined by the AGREE Collaboration (www.agreetrust.org). Evidence was synthesized and graded using a comprehensive multicriteria methodology (EVIDEM) (www.evidem.org/praderwilli).Conclusions:Following a multi-disciplinary evaluation preferably by experts, rhGH treatment should be considered for patients with genetically-confirmed PWS in conjunction with dietary, environmental and lifestyle interventions. Cognitive impairment should not be a barrier to treatment, and informed consent/assent should include benefit/risk information. Exclusion criteria should include severe obesity, uncontrolled diabetes mellitus, untreated severe obstructive sleep apnea, active cancer or psychosis. Clinical outcome priorities should vary depending upon age and the presence of physical, mental and social disability, and treatment should be continued for as long as demonstrated benefits outweigh the risks.
    No preview · Article · Mar 2013 · The Journal of Clinical Endocrinology and Metabolism
  • David B Allen · Leona Cuttler
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    ABSTRACT: A family seeks evaluation and treatment of short stature in their 11.5-year-old son. He previously was in the 3rd percentile for height, but his growth rate has slowed during the past 2 years, and his height is now just below the 1st percentile (Fig. 1). His mother is 5 ft 0 in. (152 cm), and his father is 5 ft 6 in. (167 cm). The child's size at birth was normal. His medical history and a review of systems are unremarkable. His physical examination is normal and shows prepubertal development. The complete blood count, erythrocyte sedimentation rate, thyrotropin, tissue transglutaminase antibody, and insulin-like growth factor I (IGF-I) levels and growth hormone levels after provocative testing are normal. His skeletal maturation (bone age) is approximately 9 years, and his predicted adult height is 5 ft 5 in. (165 cm) plus or minus 1.3 in. (3.3 cm).(1) How should his condition be managed?
    No preview · Article · Mar 2013 · New England Journal of Medicine
  • Aaron Carrel · David B. Allen
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    ABSTRACT: Prader-Willi syndrome (PWS), initially described by Prader, Willi, and Labhart in 1956, is characterized by obesity, hypotonia, hyperphagia, delayed motor skill acquisition, short stature, mental retardation, hypothalamic dysfunction, and hypogonadism. This article reviews current knowledge regarding causes of and potential treatments for impaired growth, body composition, and physical function observed in children with PWS. Growth failure due to PWS has become an approved indication for growth hormone (GH) therapy. However, treatment of these children has raised awareness of other potential benefits of GH therapy, which in this particular group of patients may exceed linear growth promotion in importance. These include improvements in body composition, which leads to improved physical strength and function and increased energy expenditure.
    No preview · Chapter · Jan 2013
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    David B Allen
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    ABSTRACT: Caloric intake that exceeds energy expended and its consequences, particularly development of type 2 diabetes mellitus, is emblematic of a climate change for modern medicine - a phenomenon so complex, embedded in culture and economics, and intertwined with conflicts between individual freedom and societal health that solutions are difficult to envision. Chronic caloric surplus (rather than obesity itself) is a central cause of epidemic type 2 diabetes,(1) but differences in response to energy excess,(2)-(4) disproportionately present among disadvantaged youth, increase susceptibility to type 2 diabetes in early life. Indeed, the percentage of type 2 diabetes in cases of new-onset . . .
    Preview · Article · Apr 2012 · New England Journal of Medicine
  • David B Allen · Norman Fost

    No preview · Article · Apr 2012 · The Journal of pediatrics

  • No preview · Article · Apr 2012 · Journal of Pediatric and Adolescent Gynecology

Publication Stats

4k Citations
671.81 Total Impact Points

Institutions

  • 1988-2015
    • University of Wisconsin–Madison
      • Department of Pediatrics
      Madison, Wisconsin, United States
  • 2010
    • The American Board of Family Medicine
      Lexington, Kentucky, United States
  • 2009
    • St. Mary's Hospital (WI, USA)
      Madison, Wisconsin, United States
  • 1996-2009
    • Children's Hospital of Wisconsin
      Madison, Wisconsin, United States
  • 2005
    • University of Maryland, Baltimore
      • Department of Physical Therapy and Rehabilitation Science
      Baltimore, Maryland, United States
  • 2000
    • Saint Louis University
      • Department of Pediatrics
      Saint Louis, MI, United States
  • 1990
    • Medical College of Wisconsin
      Milwaukee, Wisconsin, United States