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1.
Prev Sci ; 23(7): 1299-1307, 2022 10.
Artículo en Inglés | MEDLINE | ID: mdl-35951253

RESUMEN

Pediatric primary care is a promising setting for reducing diversion of stimulant medications for ADHD. We tested if training pediatric primary care providers (PCPs) increased use of diversion prevention strategies with adolescents with ADHD. The study was a cluster-randomized trial in 7 pediatric primary care practices. Participants were pediatric PCPs (N = 76) at participating practices. Practices were randomized to a 1-h training in stimulant diversion prevention or treatment-as-usual. At baseline, 6 months, 12 months, and 18 months, PCPs rated how often they used four categories of strategies: patient/family education, medication management/monitoring, assessment of mental health symptoms/functioning, and assessment of risky behaviors. They completed measures of attitudes, implementation climate, knowledge/skill, and resource constraints. Generalized Estimating Equations estimated differences in outcomes by condition. Mediation analyses tested if changes in knowledge/skill mediated training effects on strategy use. PCPs in the intervention condition reported significantly greater use of patient/family education strategies at all follow-up time points. There were no differences between conditions in medication management, assessment of mental health symptoms/functioning, or assessment of risky behaviors. At 6 months, PCPs in the intervention condition reported more positive attitudes toward diversion prevention, stronger implementation climate, greater knowledge/skill, and less resource constraints. Differences in knowledge/skill persisted at 12 months and 18 months. Brief training in stimulant diversion had substantial and enduring effects on PCPs' self-reported knowledge/skill and use of patient/family education strategies to prevent diversion. Training had modest effects on attitudes, implementation climate, and resource constraints and did not change use of strategies related to medication management and assessment of mental health symptoms/functioning and risky behaviors. Changes in knowledge/skill accounted for 49% of the total effect of training on use of patient/family education strategies. Trial registration This trial is registered on ClinicalTrials.gov (NCT03080259). Posted March 15, 2017.


Asunto(s)
Trastornos Mentales , Salud Mental , Adolescente , Niño , Humanos , Atención Primaria de Salud
2.
J Res Adolesc ; 29(2): 357-368, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-31206882

RESUMEN

This study used data from Add Health to examine the relationship between shared participation in religious activities and positive stepfamily functioning as indicated by the closeness of the stepfather-stepchild bond, the closeness of the mother-child bond, the quality of the mother-stepfather relationship, the adolescent's perception of family belonging, and the stability of the mother-stepfather marriage. The study incorporated information on shared religious participation between adolescents and their mothers and stepfathers by examining whether adolescents reported frequently attending religious services or church-related events with both parents, with one parent, or with neither parent. Shared religious attendance was positively associated with several aspects of stepfamily functioning above and beyond the positive association of family members' engagement in other types of shared activities.


Asunto(s)
Relaciones Familiares/psicología , Relaciones Padre-Hijo , Padres/psicología , Religión y Psicología , Adolescente , Femenino , Humanos , Masculino
3.
J Atten Disord ; 28(10): 1378-1391, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38859688

RESUMEN

OBJECTIVE: The concept of the "helicopter parent" was popularized in the 2000s and 2010s by Western culture, and it has recently begun to be examined by researchers to describe parental over-involvement and intrusive behavior that impedes transition into adulthood. Research has yet to investigate the viability of this construct for adolescents when parenting is needed to facilitate the development of autonomy. The present study examined the psychometric structure of a modified "helicopter parenting" measure adapted for use in a sample with increased likelihood of highly involved parenting: adolescents with ADHD. METHODS: Adolescents (n = 333; age 13-18 years; 25% female) and their parents (n = 341, 91% female) completed a survey for a study on provider training in stimulant diversion prevention in 2016 and 2017. We modified a previously validated measure of "helicopter parenting" for young adults. Other previously established parenting measures were included. We conducted principal component analysis for both informants' reports of the modified measure. We examined associations between the components and informants' demographic characteristics and parenting measures to begin to examine convergent and discriminant validity. RESULTS: Two components were identified for adolescent and parent reports and labeled parental Intervention and Day-to-day Monitoring and Planning. These components were differentially associated with demographic characteristics and other measures of parenting. For example, across reporters, parents exhibited less Day-to-Day Monitoring and Planning for older adolescents. Racially/ethnically minoritized parents and male adolescents reported more Intervention parenting. Modest-sized statistically significant associations were found between these indicators of highly involved parenting and the other measures of parenting. CONCLUSION: Findings provide initial evidence of construct validity. Future work with more heterogeneous samples should examine if this measure captures adaptive parenting, or behaviors that interfere with developing independence, for adolescents with ADHD and neurotypically developing adolescents.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad , Responsabilidad Parental , Psicometría , Humanos , Adolescente , Masculino , Responsabilidad Parental/psicología , Femenino , Psicometría/instrumentación , Trastorno por Déficit de Atención con Hiperactividad/psicología , Trastorno por Déficit de Atención con Hiperactividad/diagnóstico , Relaciones Padres-Hijo , Padres/psicología , Encuestas y Cuestionarios/normas , Adulto , Reproducibilidad de los Resultados
4.
Endocr Rev ; 29(7): 777-822, 2008 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-18971485

RESUMEN

The "metabolic syndrome" (MetS) is a clustering of components that reflect overnutrition, sedentary lifestyles, and resultant excess adiposity. The MetS includes the clustering of abdominal obesity, insulin resistance, dyslipidemia, and elevated blood pressure and is associated with other comorbidities including the prothrombotic state, proinflammatory state, nonalcoholic fatty liver disease, and reproductive disorders. Because the MetS is a cluster of different conditions, and not a single disease, the development of multiple concurrent definitions has resulted. The prevalence of the MetS is increasing to epidemic proportions not only in the United States and the remainder of the urbanized world but also in developing nations. Most studies show that the MetS is associated with an approximate doubling of cardiovascular disease risk and a 5-fold increased risk for incident type 2 diabetes mellitus. Although it is unclear whether there is a unifying pathophysiological mechanism resulting in the MetS, abdominal adiposity and insulin resistance appear to be central to the MetS and its individual components. Lifestyle modification and weight loss should, therefore, be at the core of treating or preventing the MetS and its components. In addition, there is a general consensus that other cardiac risk factors should be aggressively managed in individuals with the MetS. Finally, in 2008 the MetS is an evolving concept that continues to be data driven and evidence based with revisions forthcoming.


Asunto(s)
Síndrome Metabólico , Animales , Humanos , Síndrome Metabólico/epidemiología , Síndrome Metabólico/fisiopatología , Síndrome Metabólico/terapia
5.
J Nutr ; 142(6): 1155S-62S, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22573780

RESUMEN

The rise in pediatric obesity since the 1970s has been well established in the United States and is becoming a major concern worldwide. As a potential means to help slow the obesity epidemic, low-calorie sweeteners (LCS) have gained attention as dietary tools to assist in adherence to weight loss plans or prevention of excess weight gain. Observational studies tend to show positive correlations between LCS consumption and weight gain in children and adolescents. Although the data are intriguing, these epidemiologic studies do not establish that LCS cause weight gain, because there are likely many lifestyle and genetic differences between children and families who choose to consume LCS and those who do not. Short-term randomized controlled trials have shown LCS use to be BMI neutral or to have modest weight-reducing effects in overweight and obese adolescents. The long-term effects of LCS in children and adolescents are unknown. Some compelling research is currently underway and may provide needed insight into the potential role of LCS in weight management. The paucity of data regarding the effects of LCS use in children and adolescents creates challenges in decision-making for health care providers and parents.


Asunto(s)
Ingestión de Energía , Obesidad , Edulcorantes/administración & dosificación , Pérdida de Peso , Adolescente , Fenómenos Fisiológicos Nutricionales de los Adolescentes , Niño , Fenómenos Fisiológicos Nutricionales Infantiles , Preescolar , Humanos , Lactante , Obesidad/epidemiología , Obesidad/prevención & control , Estados Unidos/epidemiología
6.
Am J Psychiatry ; 179(5): 388-392, 2022 05.
Artículo en Inglés | MEDLINE | ID: mdl-35491569

RESUMEN

OBJECTIVE: The authors examined representation and accuracy of descriptions of sociodemographic identities in psychiatric research through quantifying data contained in recently published articles from a high-impact psychiatry journal. METHODS: Sociodemographic data were aggregated from articles (i.e., studies that provide information on individual samples) published in the American Journal of Psychiatry in 2019 and 2020 (N=125). Articles were coded by two raters for sociodemographic data, acknowledgment of lack of representation as a limitation, and focus on health disparities or inequities. RESULTS: While 90% of studies provided the age of participants and 84% provided information about the sex/gender of participants, only 43% presented information about the racial or ethnicity identities of participants. One study reported the sexual identity of participants. Lack of representation relative to 2019 U.S. Census data was found for multiple racial groups, Latino/Hispanic individuals, and women (genetic studies only). Only 25% of studies acknowledged lack of representation as a limitation, and two studies focused on health disparities or inequities. CONCLUSIONS: These findings highlight a need to increase representation in psychiatric research and improve accuracy of language when describing the sociodemographic characteristics of participants.


Asunto(s)
Psiquiatría , Etnicidad , Femenino , Humanos , Grupos Raciales , Estados Unidos
7.
J Dev Behav Pediatr ; 42(7): 540-552, 2021 09 01.
Artículo en Inglés | MEDLINE | ID: mdl-33908377

RESUMEN

OBJECTIVE: To describe the clinical and psychosocial characteristics, and their hypothesized interrelations, as it pertains to risk for stimulant diversion (sharing, selling, or trading) for adolescents in pediatric primary care treatment for attention-deficit/hyperactivity disorder. METHODS: Baseline data for 341 adolescents in a cluster-randomized controlled trial of stimulant diversion prevention in pediatric primary care (NCT_03080259) were used to (1) characterize diversion and newly measured risk factors, (2) examine their associations with age and sex, and (3) test whether associations among risk factors were consistent with model-implied predictions. Data were collected through multi-informant electronic surveys from adolescents and parents. RESULTS: Diversion was rare (1%) in this sample (Mage = 15, SD = 1.5, 74% male participants). Older age was associated with being approached to divert (r = 0.25, p < 0.001) and higher risk on variables pertinent to stimulant treatment, such as treatment disclosure (r = 0.12, p < 0.05), tolerance for stimulant misuse and diversion (r = 0.17, p < 0.05), and peer norms favorable to stimulant misuse and diversion (r values = 0.15-0.34, p < 0.001). Sex differences were minimal. Variables from our conceptual model and specific to stimulants (e.g., perceived likelihood of negative consequences from diversion and schoolmate stimulant misuse/diversion) were related in multivariable regressions to hypothesized immediate precursors of diversion (e.g., diversion intentions). CONCLUSION: Although diversion was rare for these primary care-treated adolescents, risk levels appear to be higher for older adolescents. Prevention may be most effective by capitalizing on current psychosocial strengths and discussing stimulant-specific attitudes, behaviors, and social norms before vulnerability to diversion increases in the final years of high school and into college.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad , Estimulantes del Sistema Nervioso Central , Adolescente , Anciano , Trastorno por Déficit de Atención con Hiperactividad/tratamiento farmacológico , Estimulantes del Sistema Nervioso Central/efectos adversos , Niño , Femenino , Humanos , Masculino , Desvío de Medicamentos bajo Prescripción , Atención Primaria de Salud , Encuestas y Cuestionarios
8.
J Adolesc Health ; 68(4): 808-815, 2021 04.
Artículo en Inglés | MEDLINE | ID: mdl-33446402

RESUMEN

PURPOSE: Diversion of stimulant medications for ADHD is a prevalent problem. Pediatric primary care providers (PCPs) are well-positioned to reduce diversion risk among adolescents prescribed stimulants, but little is known about their use of prevention strategies. The objectives of this study were to describe the frequency with which pediatric PCPs use diversion prevention strategies and examine potential determinants (facilitators and barriers) of strategy use. METHODS: Participants were pediatric PCPs (N = 76) participating in a randomized controlled trial of stimulant diversion prevention strategies. At baseline, before randomization, PCPs rated the frequency with which they used specific strategies in each of four categories: patient/family education, medication management/monitoring, assessment of mental health symptoms/functioning, and assessment of risky behaviors. They completed measures of attitudes toward diversion prevention, subjective norms (i.e., implementation climate), and perceived behavioral control (i.e., knowledge/skill, resource constraints). Associations between determinants and strategy use were tested with correlational and regression analyses. RESULTS: PCPs used strategies for assessing mental health symptoms/functioning most frequently and patient/family education strategies least frequently. Attitudes about the effectiveness of diversion prevention, implementation climate, knowledge/skill, and resource constraints were positively correlated with the use of at least one category of strategies. In regression analysis, PCP knowledge/skill was positively associated with patient/family education, medication management, and risk assessment strategies. CONCLUSIONS: Findings suggest that improving knowledge and skill may increase the use of diversion prevention strategies by PCPs. Identifying provider-level determinants of strategy use informs implementation efforts in pediatric primary care and can facilitate efforts to prevent stimulant diversion among adolescents.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad , Estimulantes del Sistema Nervioso Central , Adolescente , Trastorno por Déficit de Atención con Hiperactividad/tratamiento farmacológico , Estimulantes del Sistema Nervioso Central/uso terapéutico , Niño , Personal de Salud , Humanos , Salud Mental , Atención Primaria de Salud
9.
J Am Assoc Nurse Pract ; 33(11): 1042-1049, 2020 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-32890053

RESUMEN

ABSTRACT: Heart failure (HF) is a growing health problem associated with high morbidity and mortality. Use of evidence-based therapies improves clinical outcomes in patients with HF with reduced ejection fraction (HFrEF). However, in real-world research studies, adults with HFrEF were often medically undermanaged, including failure to use the right medications and failure to up titrate core HF therapies to doses similar to those used in randomized controlled trials. Although guidelines provide best-practice statements about care management, nurse practitioners and physician assistants (NPs and PAs) and clinical nurses often have questions about how to implement guideline-directed therapies in patient care management. With emerging new medications for managing HFrEF, and the possibility of new medications for patients with HF with preserved ejection fraction, complexity of care management will continue to increase. The aims of this review are to provide a summary of the 2017 updates to the national chronic HF management guidelines and use a case-based approach to discuss treatment change considerations associated with optimal guideline-based clinical care.


Asunto(s)
Insuficiencia Cardíaca , Adulto , Insuficiencia Cardíaca/tratamiento farmacológico , Humanos , Volumen Sistólico
10.
Artículo en Inglés | MEDLINE | ID: mdl-32830098

RESUMEN

BACKGROUND: Attention-deficit/hyperactivity disorder (ADHD) symptoms persist into adulthood and are associated with functional impairments. Neuroimaging studies of reward-modulated inhibitory control can identify potential objective markers of impairment and may deepen our understanding of why probands engage in costly behaviors leading to adverse outcomes. The study aimed to identify reward-modulated inhibitory control neural circuitries, their association with ADHD symptoms, and real-world implications of a decreased capacity to engage in reward-modulated inhibitory control. METHODS: A total of 106 adults (90% male) with rigorous childhood diagnoses of ADHD were scanned with functional magnetic resonance imaging during the Monetary Incentive Go/NoGo task. Adulthood symptoms of inattention and hyperactivity/impulsivity based on self- and informant report were assessed. The number of lifetime attempts taken to quit smoking were also assessed as an exemplar real-world outcome. RESULTS: Hyperactivity/impulsivity was negatively associated with activation in the pallidum and primary motor cortex when inhibiting a previously rewarded Go stimulus that yielded a small immediate reward in order to obtain a larger reward later on. Reduced recruitment of the pallidal-thalamic-motor circuit mediated the negative association between hyperactivity/impulsivity and reward-modulated inhibitory control accuracy. Reduced pallidum activation, in response to reward-modulated inhibitory control, was also associated with more attempts made to successfully quit smoking. CONCLUSIONS: Probands with persistent hyperactivity/impulsivity symptoms have alterations in brain regions that calculate the value of inhibiting an action that yields an immediate reward in order to obtain delayed larger rewards. This deficit results in poor inhibitory control on basic tasks and during real-world behaviors that rely on similar processes.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad , Adulto , Niño , Vías Eferentes , Femenino , Globo Pálido , Humanos , Imagen por Resonancia Magnética , Masculino , Recompensa
11.
Acad Pediatr ; 20(1): 119-127, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31185307

RESUMEN

OBJECTIVE: To address increasing rates of stimulant misuse in college students, this study developed an evidence-based, brief clinical practice intervention for primary care providers (PCPs) to reduce stimulant medication diversion among young adults with attention-deficit/hyperactivity disorder (ADHD). METHODS: College students (N-114; 18-25 years; 68% attending universities; 24% attending community college) treated for ADHD with a stimulant and their PCPs across six practices participated in this initial, uncontrolled study of pre- to post-intervention change. An educational workshop providing strategies aimed at reducing stimulant diversion was developed and delivered to providers and staff across all practices (50% pediatric; 50% family medicine). Patients and providers completed baseline and post intervention surveys. RESULTS: Diversion was relatively infrequent, 16.7% at baseline and 14.9% post-intervention, respectively. Statistically significant decreases from baseline to post-intervention were found for three diversion risk factors: (1) number of times approached to divert, (2) intent to share, sell, or trade stimulants, and (3) disclosure of stimulant use. Providers and staff reported mostly high satisfaction with the training. CONCLUSIONS: This study provides initial evidence for a PCP-delivered intervention to reduce stimulant diversion. Research is needed on the efficacy of targeting college students directly, working with pharmacies and student health centers, and preventing misuse among teenagers.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad/tratamiento farmacológico , Estimulantes del Sistema Nervioso Central/administración & dosificación , Educación Médica Continua , Desvío de Medicamentos bajo Prescripción/prevención & control , Atención Primaria de Salud , Estudiantes/psicología , Trastornos Relacionados con Sustancias/prevención & control , Adolescente , Adulto , Femenino , Humanos , Masculino
12.
J Marriage Fam ; 78(3): 730-743, 2016 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-27152051

RESUMEN

This study draws on nationally representative data from Waves I and III of the National Longitudinal Study of Adolescent to Adult Health (Add Health) to prospectively examine the factors associated with different patterns of closeness between stepchildren and their stepfathers over the transition to adulthood in stably married stepfamilies (N = 881). Results indicate much variability in how these relationships unfold over time, although a sizable minority of youth remained close to their stepfathers. Consistent with family systems theory, the quality of other family relationships is particularly important to understanding children's relationships with stepfathers as they develop over time.

13.
Front Physiol ; 7: 32, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-26903882

RESUMEN

Exercise is a potent strategy to facilitate long-term weight maintenance. In addition to increasing energy expenditure and reducing appetite, exercise also favors the oxidation of dietary fat, which likely helps prevent weight re-gain. It is unclear whether this exercise-induced metabolic shift is due to changes in energy balance, or whether exercise imparts additional adaptations in the periphery that limit the storage and favor the oxidation of dietary fat. To answer this question, adipose tissue lipid metabolism and related gene expression were studied in obese rats following weight loss and during the first day of relapse to obesity. Mature, obese rats were weight-reduced for 2 weeks with or without daily treadmill exercise (EX). Rats were weight maintained for 6 weeks, followed by relapse on: (a) ad libitum low fat diet (LFD), (b) ad libitum LFD plus EX, or (c) a provision of LFD to match the positive energy imbalance of exercised, relapsing animals. 24 h retention of dietary- and de novo-derived fat were assessed directly using (14)C palmitate/oleate and (3)H20, respectively. Exercise decreased the size, but increased the number of adipocytes in both retroperitoneal (RP) and subcutaneous (SC) adipose depots, and prevented the relapse-induced increase in adipocyte size. Further, exercise decreased the expression of genes involved in lipid uptake (CD36 and LPL), de novo lipogenesis (FAS, ACC1), and triacylglycerol synthesis (MGAT and DGAT) in RP adipose during relapse following weight loss. This was consistent with the metabolic data, whereby exercise reduced retention of de novo-derived fat even when controlling for the positive energy imbalance. The decreased trafficking of dietary fat to adipose tissue with exercise was explained by reduced energy intake which attenuated energy imbalance during refeeding. Despite having decreased expression of lipogenic genes, the net retention of de novo-derived lipid was higher in both the RP and SC adipose of exercising animals compared to their energy gap-matched controls. Our interpretation of this data is that much of this lipid is being made by the liver and subsequently trafficked to adipose tissue storage. Together, these concerted effects may explain the beneficial effects of exercise on preventing weight regain following weight loss.

14.
J Marriage Fam ; 77(5): 1179-1189, 2015 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26508804

RESUMEN

This study contributes to the growing literature on factors associated with the formation of close relationships between stepfathers and stepchildren. The authors extend prior research by using nationally representative data from Add Health (N = 179) to examine how factors existing prior to stepfamily formation are associated with the quality of stepfather-adolescent ties within the first year after married stepfathers join the household. Results from structural equation models revealed that both the quality of the mother-adolescent relationship and adolescent adjustment prior to stepfamily formation were significantly associated with the perceived quality of adolescents' relationships with their stepfathers.

15.
Obes Facts ; 6(3): 228-38, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23711772

RESUMEN

Obesity is associated with numerous short- and long-term health consequences. Low levels of physical activity and poor dietary habits are consistent with an increased risk of obesity in an obesogenic environment. Relatively little research has investigated associations between eating and activity behaviors by using a systems biology approach and by considering the dynamics of the energy balance concept. A significant body of research indicates that a small positive energy balance over time is sufficient to cause weight gain in many individuals. In contrast, small changes in nutrition and physical activity behaviors can prevent weight gain. In the context of weight management, it may be more feasible for most people to make small compared to large short-term changes in diet and activity. This paper presents a case for the use of small and incremental changes in diet and physical activity for improved weight management in the context of a toxic obesogenic environment.


Asunto(s)
Ingestión de Energía/fisiología , Metabolismo Energético/fisiología , Ejercicio Físico/fisiología , Conducta Alimentaria , Conductas Relacionadas con la Salud , Obesidad/prevención & control , Aumento de Peso/fisiología , Dieta , Humanos , Actividad Motora , Obesidad/etiología , Obesidad/metabolismo , Factores de Riesgo , Conducta Sedentaria
16.
Obesity (Silver Spring) ; 19(7): 1388-95, 2011 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-21475140

RESUMEN

No randomized studies in humans have examined whether fat returns after removal or where it returns. We undertook a prospective, randomized-controlled trial of suction lipectomy in nonobese women to determine if adipose tissue (AT) is defended and if so, the anatomic pattern of redistribution. Healthy women with disproportionate AT depots (lower abdomen, hips, or thighs) were enrolled. Baseline body composition measurements included dual-energy X-ray absorptiometry (DXA) (a priori primary outcome), abdominal/limb circumferences, subcutaneous skinfold thickness, and magnetic resonance imaging (MRI) (torso/thighs). Participants (n = 32; 36 ± 1 year) were randomized to small-volume liposuction (n = 14, mean BMI: 24 ± 2 kg/m(2)) or control (n=18, mean BMI: 25 ± 2) following baseline. Surgery group participants underwent liposuction within 2-4 weeks. Identical measurements were repeated at 6 weeks, 6 months, and 1 year later. Participants agreed not to make lifestyle changes while enrolled. Between-group differences were adjusted for baseline level of the outcome variable. After 6 weeks, percent body fat (%BF) by DXA was decreased by 2.1% in the lipectomy group and by 0.28% in the control group (adjusted difference (AD): -1.82%; 95% confidence interval (CI): -2.79% to -0.85%; P = 0.0002). This difference was smaller at 6 months, and by 1 year was no longer significant (0.59% (control) vs. -0.41% (lipectomy); AD: -1.00%; CI: -2.65 to 0.64; P = 0.23). AT reaccumulated differently across various sites. After 1 year the thigh region remained reduced (0.77% (control) vs. -1.83% (lipectomy); AD: -2.59%; CI: -3.91 to -1.28; P = 0.0001), but AT reaccumulated in the abdominal region (0.64% (control) vs. 0.42% (lipectomy); AD: -0.22; CI: -2.35 to 1.91; P = 0.84). Following suction lipectomy, BF was restored and redistributed from the thigh to the abdomen.


Asunto(s)
Distribución de la Grasa Corporal , Lipectomía , Sobrepeso/patología , Sobrepeso/cirugía , Grasa Subcutánea/patología , Legrado por Aspiración , Absorciometría de Fotón , Adulto , Índice de Masa Corporal , Tamaño Corporal , Femenino , Humanos , Imagen por Resonancia Magnética , Persona de Mediana Edad , Recurrencia , Grosor de los Pliegues Cutáneos , Grasa Subcutánea/cirugía , Grasa Subcutánea Abdominal/patología , Grasa Subcutánea Abdominal/cirugía
18.
Exp Physiol ; 92(5): 823-30, 2007 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-17573413

RESUMEN

Habitually exercising adults demonstrate greater thermogenic responsiveness to beta-adrenergic receptor (beta-AR) stimulation compared with their sedentary peers, but the molecular mechanisms involved are unknown. To determine the possible role of increased beta-AR density, we studied 32 healthy adults: 17 habitual aerobic exercisers (age 45 +/- 5 years, 11 males) and 15 sedentary (49 +/- 5 years, 7 males). Maximal oxygen uptake (43.7 +/- 2.5 versus 31.6 +/- 2.9 ml kg(-1) min(-1), P = 0.002, mean +/- S.E.M.) and vastus lateralis muscle maximal citrate synthase activity (1.70 +/- 0.36 versus 0.58 +/- 0.11 micromol min(-1) g(-1), P = 0.008) were higher in the habitually exercising subjects. Resting energy expenditure (EE) adjusted for fat-free mass (FFM) was similar in the habitually exercising (5903 +/- 280 kJ day(-1)) and sedentary adults (6054 +/- 289 kJ day(-1), P = 0.43). The percentage increase in EE (DeltaEE%; indirect calorimetry, ventilated hood) above resting EE in response to beta-AR stimulation (intravenous isoproterenol at 6, 12 and 24 ng (kg FFM)(-1) min(-1)) was greater (7.1 +/- 1.2, 13.7 +/- 1.0, 20.7 +/- 1.3 versus 5.9 +/- 0.9, 9.9 +/- 1.4, 15.9 +/- 1.70%, respectively, P = 0.04), and the dose of isoproterenol required to increase EE by 10% above resting EE was lower (8.2 +/- 1.5 versus 17.1 +/- 4.1 ng (kg FFM)(-1) min(-1), P = 0.03) in the habitually exercising adults. In contrast, vastus lateralis muscle beta(2)-AR density was similar in the habitually exercising and sedentary subjects (7.46 +/- 0.29 versus 7.44 +/- 0.60 fmol (mg dry weight muscle)(-1), P = 0.98), and was not related to DeltaEE% (r = 0.02, P = 0.94) or to the isoproterenol dose required to increase EE by 10% above resting EE (r = -0.06, P = 0.76). These findings indicate that increased beta(2)-AR density is not a mechanism contributing to the greater thermogenic responsiveness to beta-AR stimulation in adult humans who regularly perform aerobic exercise.


Asunto(s)
Agonistas Adrenérgicos beta/administración & dosificación , Regulación de la Temperatura Corporal/fisiología , Ejercicio Físico/fisiología , Isoproterenol/administración & dosificación , Receptores Adrenérgicos beta 2/metabolismo , Adulto , Composición Corporal , Regulación de la Temperatura Corporal/efectos de los fármacos , Femenino , Humanos , Inyecciones Intravenosas , Masculino , Persona de Mediana Edad , Músculo Esquelético/metabolismo , Intercambio Gaseoso Pulmonar/fisiología
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