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1.
J Res Adolesc ; 2024 Apr 01.
Article in English | MEDLINE | ID: mdl-38561961

ABSTRACT

Gains in holistic approaches to adult mental health have been associated with increasing interest in understanding psychological wellbeing (PWB) among adolescents. Empirical examination of measurement models for PWB in adolescence is lacking. Thus, the current study examined PWB in a longitudinal, diverse sample of 433 adolescents (non-Latinx Black: 37.6%; non-Latinx White: 25.9%; Latinx: 36.5%; Male adolescents: 50.1%). A one-factor, correlated six-factor and hierarchical models were examined across racial/ethnic (White, Black, and Hispanic) and gender (female, male) identities, after which the best fitting model was selected to undergo invariance testing. A one-factor structure was superior, and exhibited strict invariance across racial/ethnic and gender identities at each wave of the study, as well as longitudinal invariance within the entire sample.

2.
Dev Psychopathol ; : 1-15, 2023 Jun 22.
Article in English | MEDLINE | ID: mdl-37345691

ABSTRACT

Family functioning may serve as protective or risk factors in the development of youth psychopathology. However, few studies have examined the potentially reciprocal relation between child psychopathology and family functioning. To fill this gap in the literature, this study tested for time-ordered associations between measures of family functioning (e.g., cohesion, conflict, and emotional expressiveness) and child psychopathology (e.g., total behavior problems, externalizing, and internalizing problems) using data from the Longitudinal Studies of Child Abuse and Neglect (LONGSCAN; N = 1143, 52.3% female, Nwaves = 5). We used a random-intercept cross-lagged panel model to identify whether child psychopathology preceded and predicted family functioning, the reverse, or both processes occurred simultaneously. At the between-person level, families who tended to have more cohesion, who lacked conflict, and who expressed their emotions had lower levels of child psychopathology. At the within-person level in childhood, we found minimal evidence for time-ordered associations. In adolescence, however, a clear pattern whereby early psychopathology consistently predicted subsequent family functioning emerged, and the reverse direction was rarely found. Results indicate a complex dynamic relation between the family unit and child that have important implications for developmental models that contextualize risk and resilience within the family unit.

3.
Child Indic Res ; 16(2): 617-639, 2023.
Article in English | MEDLINE | ID: mdl-36310919

ABSTRACT

The COVID-19 pandemic is a global mental health crisis that disproportionately impacts adolescents. Loneliness is a particularly salient pandemic psychosocial outcome to understand; however, research to date on this outcome is sparse and largely cross-sectional. In response, we examined pre-pandemic risk factors for pandemic loneliness. Further, we examined how risk may differ based on key demographics, and whether mediation or moderation models best explained potential disparities in experiencing loneliness. Self-reported, pre-pandemic mental health, trauma exposure, and family conflict survey data were collected at Wave 1 in a diverse sample of 369 adolescents (54.5% female, 45.5% male; 30.1% White; 30.9% Black; 18.4% Hispanic; Mage = 15.04; SD age = 1.10). Subsequently, self-reported experiences of loneliness during the pandemic were collected 6 months (April-June 2020) and 12 months (October-December 2020) later. Using a regression-based framework (i.e., PROCESS), we tested (a) which pre-pandemic risks uniquely predicted prospective loneliness and (b) whether loneliness risk was elevated for certain identities (i.e., mediation models) or whether certain identities were more sensitive to specific risks (i.e., moderation models). Overall, pre-pandemic depressive and aggression symptoms predicted early pandemic loneliness (6-month follow-up), whereas anxiety symptoms specifically predicted mid-pandemic loneliness (12-month follow-up). Environmental stressors were moderated by gender, such that females with pre-pandemic trauma exposure were more likely to report pandemic loneliness. Further, pre-pandemic internalizing distress for girls and externalizing symptoms for boys, reflected gender-specific pathways for loneliness. Implications for mental health prevention in the wake of national disasters are discussed. Supplementary Information: The online version contains supplementary material available at 10.1007/s12187-022-09984-8.

4.
J Affect Disord ; 319: 518-525, 2022 12 15.
Article in English | MEDLINE | ID: mdl-36162694

ABSTRACT

BACKGROUND: Research suggests adolescent depression is increasing and certain adolescents may be uniquely vulnerable. However, limited conceptualizations of identity and time, as well as the reliance on unitary conceptualizations of depression, inhibits a nuanced perspective on these trends. In response, we examined how adolescent depressive symptoms, depressed mood, and anhedonia, vary across intersecting identities over time. METHODS: Secondary data analysis on the National Survey on Drug Use and Health between 2009 and 2017 was conducted. In total 145,499 nationally representative adolescents (ages 12-17) completed a diagnostic assessment for depression. Lifetime and past year reports of depressive symptoms, depressed mood, and anhedonia were treated as separate variables. A novel, mixed-level model in which participants were nested within identity (defined by one's age, gender, race/ethnicity, poverty level) and time was used to test our aims. RESULTS: Overall, the relation between depression outcomes and identity did not vary over time (p > .01). Further, identity's impact on depression was approximately ten-fold that of temporal effects. Multiracial, late adolescent, female adolescents were at particular risk. Findings concerning depressed mood and anhedonia were similar across analyses. LIMITATIONS: All facets of identity (e.g., sexual identity) were not included in the model and a unidimensional measure of poverty may have underestimated its depressogenic influence. CONCLUSION: Adolescent depression outcomes are mostly consistent across criterial symptom subtypes and time, but vary as a function of identity. Prevention protocols that highlight mechanisms of risk tethered to social identity, and include salient experiences of females, late adolescents, and multiracial youth in particular, need to be prioritized in mental health initiatives.


Subject(s)
Anhedonia , Substance-Related Disorders , Adolescent , Humans , Female , Child , Depression/psychology , Mental Health , Ethnicity
5.
Psychol Assess ; 34(8): 752-762, 2022 Aug.
Article in English | MEDLINE | ID: mdl-35549367

ABSTRACT

The Temporal Experience of Pleasure Scale (TEPS) is a self-report measure designed to assess anticipatory and consummatory pleasure, two facets of anhedonic predispositions. Despite its widespread use, the factor structure of the TEPS has yet to be tested in adolescents, who are at increased risk for psychopathology and undergoing rapid changes in reward-related processes. In response, the present study aimed to test the factor structure and measurement invariance of the TEPS across time, gender, and race/ethnicity in a diverse adolescent sample. Adolescents (N = 441; Mage = 14.98; 223 female) who identified as either Black (37%), Hispanic (37%), or White (26%), completed the TEPS at Baseline, 6-month, and 12-month follow-ups. Factor analyses were conducted to examine the factor structure of the TEPS, while configural, metric, scalar, and strict invariance were tested across time and demographics. Findings supported the two-factor structure of the TEPS, above and beyond other conceptualizations (e.g., 4-factor, bifactor), full longitudinal invariance, and partial invariance across gender and race/ethnicity. Examination of mean differences suggested no temporal, gender nor race/ethnic differences for anticipatory pleasure. For consummatory pleasure, no differences were found for gender, but results suggested higher levels over time and lower levels in Black adolescents. Our findings provide preliminary support for reliable cross-group interpretations of anticipatory and consummatory anhedonic predispositions as measured through the TEPS. Together, results provide support for the clinical utility of the TEPS for anhedonic-related psychopathology risk assessment in adolescence. (PsycInfo Database Record (c) 2022 APA, all rights reserved).


Subject(s)
Ethnicity , Pleasure , Adolescent , Factor Analysis, Statistical , Female , Hispanic or Latino , Humans , Psychometrics , Self Report
6.
J Clin Child Adolesc Psychol ; 51(5): 637-650, 2022.
Article in English | MEDLINE | ID: mdl-32412311

ABSTRACT

Objective: Given the severe consequences associated with maltreatment, establishing an understanding of pathways to resilience among trauma-exposed youth is a critical public health aim. Longitudinal research has either examined short-term or long-term responses to traumatic events, which prevents testing for a) individual differences between resilience subtypes and b) consistency of short-term, resilient responses over time. Additionally, post-traumatic stress and depression represent the two most common symptom patterns in youth exposed to maltreatment, however few studies have simultaneously investigated resilience to these outcomes. In response, the current study employs a dimensional analytic approach to distinguish between short-term (the ability to demonstrate adaptive responses to ongoing adversities) and long-term (lack of distress over several years in response to a prior adversity) resilience. Consistent with an ecological perspective, the study examines whether family- and community-level protective factors are similarly or uniquely associated with different resilience subtypes.Method: Participants included 943 individuals (469 male, 474 female) from a nationally-representative, at-risk sample of adolescents who completed self-report measures of maltreatment exposure, depressive symptoms and post-traumatic stress symptoms at ages 12, 16, and 18. During the age 12 visit, participants' caregivers completed self-report measures of family routines and neighborhood social cohesion.Results: Overall, we found that family routines uniquely buffered against trauma-related distress across resilience conceptualizations, while social cohesion played a role in short-term resilience to depressive symptoms (p <.05). Participant gender did not moderate these results (p > .05).Conclusion: These findings highlight the importance of understanding resilience dimensionally for adolescents exposed to maltreatment.


Subject(s)
Resilience, Psychological , Adolescent , Child , Female , Humans , Individuality , Longitudinal Studies , Male , Residence Characteristics , Self Report
7.
Int J Psychophysiol ; 168: 1-8, 2021 10.
Article in English | MEDLINE | ID: mdl-34280425

ABSTRACT

The autonomic nervous system (ANS) has received much attention as a potential low-cost, peripheral indicator of depression. Despite theoretical support, however, results have been mixed as to whether indices of the ANS reliably index depression. In response, the present study sought to clarify the relation between ANS activity and depression by examining cardiac autonomic balance (CAB) and cardiac autonomic regulation (CAR), two composite indices of the parasympathetic and sympathetic nervous system, within both a stressful and rewarding context. We hypothesized that CABStress, representing the difference between the parasympathetic and sympathetic branches in response to stress, and CARReward, representing the summation of the two branches in response to reward, will be most indicative of depressogenic risk. We examined the parasympathetic (i.e., respiratory sinus arrhythmia) and sympathetic (i.e., pre-ejection period) responses of 97 emerging adults (Mage = 18.93) for a stress (i.e., negative mood induction) and reward (i.e., probabilistic learning) task, as well as their depressive symptoms at baseline, 3-week, and 6-week follow-up. Analyses found partial support for our hypotheses, revealing greater CARReward (i.e., coactivation of both branches) was related to lower depressive symptoms. Further, exploratory analyses examining gender differences found lower CABStress (i.e., sympathetically-oriented response) was predictive of an increasing trajectory of depression, but only among males. Overall, the current study highlights the importance of simultaneously examining both branches of the ANS across various environmental contexts. Research and clinical implications of the current findings are discussed.


Subject(s)
Depression , Respiratory Sinus Arrhythmia , Adolescent , Adult , Autonomic Nervous System , Heart Rate , Humans , Male , Parasympathetic Nervous System , Reward , Sympathetic Nervous System , Young Adult
8.
Child Abuse Negl ; 111: 104811, 2021 01.
Article in English | MEDLINE | ID: mdl-33234389

ABSTRACT

BACKGROUND: Extant research and theory posit that emotional abuse and emotional neglect-exposure is uniquely harmful during adolescence. Yet, these findings are mostly based on mono-informant, retrospective studies with unselected adults that examine emotional maltreatment in the aggregate. This prevents inferences concerning the unique, prospective risk emotional abuse and neglect, as reported by multiple informants, may confer within at-risk, adolescent samples. OBJECTIVE: In response, the present study examined how emotional abuse and emotional neglect-exposure in adolescence uniquely related to psychological symptoms and social impairment. PARTICIPANTS AND SETTING: Our aims were tested in a child welfare system (CWS)-involved sample of adolescents (N = 657; AgeM = 12.49 at baseline) who were participating in a longitudinal study. METHODS: A multi-informant approach was used to assess emotional abuse/neglect and mental health. Physical abuse and lifetime CWS contact represented covariates in growth curve models. RESULTS: Emotional abuse predicted symptoms within informant, such that youth-reported emotional abuse predicted youth-reported internalizing, ß = 0.21, p = .001, and externalizing, ß=0.35, p = .001, symptoms while parent-reported emotional abuse predicted parent-reported externalizing, ß=0.30, p < .001, and internalizing ß=0.29, p < .001, symptoms. Meanwhile, youth-reported emotional neglect predicted heightened self-reported internalizing symptoms, ß=0.29, p < .001, parent-reported externalizing symptoms, ß=0.15, p = .002 and social impairment across youth, ß=-0.17, p = .01 and parent, ß=-0.24, p < .001, report. CONCLUSIONS: This study shows the importance of distinguishing between these maltreatment subtypes in adolescence and provides measurement recommendations for future maltreatment research. The manuscript concludes by discussing adolescent emotional abuse and neglect-exposure as a maintenance, as opposed to causal risk, factors.


Subject(s)
Child Abuse/psychology , Emotional Abuse/psychology , Child , Female , Humans , Longitudinal Studies , Male , Prospective Studies , Retrospective Studies
9.
J Trauma Stress ; 34(3): 487-500, 2021 06.
Article in English | MEDLINE | ID: mdl-33370482

ABSTRACT

Positive adaptation manifests differently in the aftermath of traumatic events. Methodological limitations, however, impede the ability to test conceptualizations of resilience that emphasize the multifaceted nature of these responses. In response, an approach that synthesized a residualized and person-centered conceptualization of resilience examined associations between aspects of resilience in an adolescent sample. In total, 584 racially/ethnically diverse adolescents (age range: 12-17 years; M = 14.98 years; SD = 1.05; 50.9% female; 30.1% White, 29.6% African American, 19.5% Hispanic) self-reported lifetime emotional maltreatment and community violence exposure as well as current levels of depression, posttraumatic stress symptoms (PTSS), violent behavior, and psychological well-being (PWB). Each mental health outcome was regressed on lifetime trauma exposure to create residuals used as indices of resilience. Correlations between the residuals suggested that PWB was more closely related to resilience to depression and PTS, rs = .17-.30, than violent behavior, r = .00. Residuals were subsequently entered into person-centered analyses to identify representative well-being profiles. Cluster analysis identified four groups, including two adaptive profiles defined by (a) lower distress and higher PWB and (b) lower psychopathology and lower PWB, based on adolescents' levels of trauma exposure. These two profiles did not vary regarding impairment, p > .999, suggesting both profiles represent positive adaption to lifetime trauma exposure. Theoretical and clinical implications of distinguishing between these two profiles by assessing PWB in adolescents are discussed, as well as how PWB may manifest within the context of different patterns of psychological distress.


Subject(s)
Exposure to Violence , Psychological Distress , Stress Disorders, Post-Traumatic , Adolescent , Child , Female , Humans , Male , Mental Health , Violence
10.
Assessment ; 28(4): 1207-1218, 2021 06.
Article in English | MEDLINE | ID: mdl-31602995

ABSTRACT

Given the risk of substance use (SU) among adolescents in the child welfare system, identification of risk for prospective impairing SU behaviors is a significant public health priority. We sought to quantify the incremental validity of routine multi-informant assessments of adolescent psychological distress (i.e., the Child Behavior Checklist and Youth Self-Report) and a commonly used SU screening protocol (i.e., the CRAFFT) to predict SU at 18 and 36 months after baseline in a nationally representative child welfare sample (N = 1,054; Mage = 13.72). We used receiver operator characteristics and reclassification analyses to develop our algorithms. We found that a battery consisting of baseline CRAFFT scores, self-reported delinquent behavior, and parent-reported rule-breaking behavior provided an incrementally valid prediction model for SU behavior among females, while baseline CRAFFT scores and self-reported delinquent behavior incrementally predicted SU for males. Results suggest that leveraging existing assessments within the child welfare system can improve forecasting of SU risk for this population.


Subject(s)
Adolescent Behavior , Substance-Related Disorders , Adolescent , Algorithms , Child , Child Welfare , Female , Humans , Male , Prospective Studies , Substance-Related Disorders/epidemiology
11.
Psychol Med ; 50(15): 2548-2556, 2020 11.
Article in English | MEDLINE | ID: mdl-31576786

ABSTRACT

BACKGROUND: Universal depression screening in youth typically focuses on strategies for identifying current distress and impairment. However, these protocols also play a critical role in primary prevention initiatives that depend on correctly estimating future depression risk. Thus, the present study aimed to identify the best screening approach for predicting depression onset in youth. METHODS: Two multi-wave longitudinal studies (N = 591, AgeM = 11.74; N = 348, AgeM = 12.56) were used as the 'test' and 'validation' datasets among youth who did not present with a history of clinical depression. Youth and caregivers completed inventories for depressive symptoms, adversity exposure (including maternal depression), social/academic impairment, cognitive vulnerabilities (rumination, dysfunctional attitudes, and negative cognitive style), and emotional predispositions (negative and positive affect) at baseline. Subsequently, multi-informant diagnostic interviews were completed every 6 months for 2 years. RESULTS: Self-reported rumination, social/academic impairment, and negative affect best predicted first depression onsets in youth across both samples. Self- and parent-reported depressive symptoms did not consistently predict depression onset after controlling for other predictors. Youth with high scores on the three inventories were approximately twice as likely to experience a future first depressive episode compared to the sample average. Results suggested that one's likelihood of developing depression could be estimated based on subthreshold and threshold risk scores. CONCLUSIONS: Most pediatric depression screening protocols assess current manifestations of depressive symptoms. Screening for prospective first onsets of depressive episodes can be better accomplished via an algorithm incorporating rumination, negative affect, and impairment.


Subject(s)
Algorithms , Depression/diagnosis , Depressive Disorder/diagnosis , Adolescent , Caregivers , Child , Female , Humans , Male , Risk Factors , Self Report
12.
Psychiatry Res ; 284: 112684, 2020 02.
Article in English | MEDLINE | ID: mdl-31740215

ABSTRACT

The identification of robust, psychophysiological markers of trauma-related distress is critical for developing comprehensive, trauma-informed, mental health assessments for youth. Thus, the present study examined the clinical utility of cardiac autonomic balance (CAB) and cardiac autonomic regulation (CAR), two composite indices of the sympathetic and parasympathetic nervous system. We hypothesized that CAB/CAR would more reliably index post-traumatic stress (PTS) responses compared to measuring the parasympathetic (i.e., respiratory sinus arrhythmia; RSA) and sympathetic (i.e., pre-ejection period; PEP) nervous systems in isolation. Our sample was comprised of 88 diverse, low-income youth (40.9% African-American and 36.4% White; 60.5% girls; Mage = 12.05 years; SDage = 1.57) who are at increased risk for adversity-exposure. RSA and PEP were measured during a 5-minute baseline period and 5-minute parent-child conflict discussion task. Adolescent-caregiver dyads completed a clinician-administered measure of the youth's lifetime trauma-exposure and current PTS. CAB represented the difference between RSA and PEP, while CAR was the summation of RSA and PEP. Analyses revealed that sympathetically-oriented CAB reactivity uniquely (a) indexed PTS, especially in the context of elevated trauma, and (b) distinguished between those with and without PTSD. Findings highlight the translational promise of using physiological markers that account for the balance between the parasympathetic and sympathetic nervous system.


Subject(s)
Heart Rate/physiology , Parasympathetic Nervous System/physiology , Respiratory Sinus Arrhythmia/physiology , Stress Disorders, Post-Traumatic/physiopathology , Stress Disorders, Post-Traumatic/psychology , Sympathetic Nervous System/physiology , Adolescent , Autonomic Nervous System/physiology , Child , Emotions/physiology , Female , Humans , Male , Risk Factors , Stress Disorders, Post-Traumatic/diagnosis
13.
Psychol Assess ; 31(8): 1028-1039, 2019 Aug.
Article in English | MEDLINE | ID: mdl-31033314

ABSTRACT

The Achenbach System of Empirically Based Assessment (ASEBA) represents the most widely used protocol for mental and behavioral health screening in the Child Welfare System (CWS). However, because past studies have (a) relied on the self- or parent report, (b) focused on the internalizing subscales, (c) focused solely on current or prospective depression, and (d) not assessed incremental validity, it is difficult to use the ASEBA to address recommended universal depression screening initiatives in the CWS. In response, the present study used an evidence-based medicine (EBM) framework to identify the best combination of subscales that predict adolescent depression outcomes within the CWS. Overall, we found that a combination of self-reported internalizing symptoms, and to a lesser extent, self-reported attention problems, delinquent behavior, and parent-reported social problems best forecasted concurrent depression status. Meanwhile, self-reported anxious/depressed and externalizing symptoms, in addition to parent-reported somatic complaints and withdrawn symptoms, were necessary to adequately forecast prospective depression outcomes. Using these algorithms, we were able to differentiate and classify youth at minimal, moderate, or substantial risk for current and future depression symptoms. Findings are contextualized with past research on the Achenbach scales and clinical implications for more targeted depression screening are discussed. (PsycINFO Database Record (c) 2019 APA, all rights reserved).


Subject(s)
Child Welfare/psychology , Depressive Disorder/diagnosis , Adolescent , Algorithms , Child , Female , Humans , Longitudinal Studies , Male , Self Report
14.
J Consult Clin Psychol ; 87(2): 184-197, 2019 Feb.
Article in English | MEDLINE | ID: mdl-30570310

ABSTRACT

OBJECTIVE: Screening protocols that rely on a single informant are inadequate in predicting pediatric depression. Multi-informant and risk factor screening approaches are potentially more sensitive methods for identifying depression risk, but the incremental validity of these protocols has not been adequately tested. Using a translational analytic approach and multimethod, longitudinal study design, we simultaneously tested several multi-indicator approaches to depression screening to identify an optimal algorithm for predicting depression onset in youth. METHOD: Participants were 222 never-depressed children and adolescents (Mage = 10.75 years old, SDage = 1.85; female = 50.45%; 82.88% White), who completed baseline questionnaires for depressive symptoms and cognitive vulnerabilities, in addition to a morphed face task to assess pupil dilation. Mothers, meanwhile, completed baseline questionnaires and a semistructured interview to assess maternal and pediatric depression. Follow-up depression diagnostic assessments with both the mother and youth occurred every 6 months for 2 years. Receiver operating characteristics and reclassification analyses were used to test our aims. RESULTS: Overall, we found moderate support for a multi-informant approach, and convincing evidence that individual differences in pupil dilation uniquely predicted depression onset. Youth with subthreshold depressive symptoms and elevated pupil dilation were over twice as likely to develop a first lifetime episode of depression compared to one's risk rate based on sex and age. CONCLUSIONS: Our study provides one of the first screening batteries for detecting first lifetime episodes of depression in youth. The unique and incremental validity provided by pupil dilation suggests feasible biological indicators of depression risk can improve primary prevention efforts that target depression, such as universal pediatric depression screening. (PsycINFO Database Record (c) 2019 APA, all rights reserved).


Subject(s)
Depression/diagnosis , Depressive Disorder/diagnosis , Adolescent , Child , Female , Humans , Longitudinal Studies , Male , Mothers
15.
Clin Diabetes ; 36(4): 305-311, 2018 Oct.
Article in English | MEDLINE | ID: mdl-30364073

ABSTRACT

IN BRIEF In this new era of accountable care and population health, large provider organizations are looking for new ways to predict diseases in their population, especially for people with diabetes. Although diabetes has been associated with the incidence of obesity, many diabetes patients are not obese. However, we find that just living in a household with one or more obese biologically related family members is a major risk factor for diabetes, even after accounting for all the other traditional risk factors.

16.
Metab Syndr Relat Disord ; 12(1): 56-61, 2014 Feb.
Article in English | MEDLINE | ID: mdl-24251951

ABSTRACT

BACKGROUND: Mitochondrial dysfunction plays a role in the development of muscle insulin resistance (IR) and the accumulation of intramyocellular lipid (IMCL) in skeletal muscle that can, in turn, interfere with insulin signaling. The purpose of this study was to assess mitochondrial function (MF) and IMCL in obese adolescent girls with and without IR to determine whether: (1) Girls with IR have impaired MF, and (2) impaired MF in girls with IR is related to higher IMCL. METHODS: We examined 22 obese girls aged 13-21 years old for IR [defined as a homeostasis model assessment of insulin resistance (HOMA-IR) value >4. Phosphorus magnetic resonance spectroscopy (31P-MRS) and proton magnetic resonance spectroscopy (1H-MRS), respectively, were used to determine MF and IMCL of the soleus muscle along with magnetic resonance imaging (MRI) measures of visceral, subcutaneous, and total adipose tissue (VAT, SAT, and TAT) in girls with HOMA-IR >4 (insulin-resistant group) versus HOMA-IR ≤ 4 (insulin-sensitive group). Serum lipids and waist-to-hip ratio (W/H) were also measured. RESULTS: Girls with IR (n=8) did not differ from the insulin-sensitive group (n=14) for age, bone age, weight, VAT, SAT, TAT, or IMCL. However, the insulin-resistant group had higher W/H. Additionally the insulin-resistance group had a lower log rate of postexercise phosphocreatine (PCr) recovery (ViPCr) and a higher log PCr recovery constant (tau), indicative of impaired MF. CONCLUSIONS: Obese girls with increased IR have impaired mitochondrial function. This association is not mediated by alterations in IMCL or adipose tissue. Further studies are necessary to determine whether there is a causal relation between impaired mitochondrial function and IR in obesity and mediators of such a relationship.


Subject(s)
Insulin Resistance , Insulin/metabolism , Mitochondria/metabolism , Obesity/physiopathology , Adipose Tissue/pathology , Adolescent , Anthropometry , Body Composition , Cross-Sectional Studies , Female , Humans , Lipids/chemistry , Magnetic Resonance Imaging , Magnetic Resonance Spectroscopy , Muscle, Skeletal/metabolism , Muscle, Skeletal/pathology , Waist-Hip Ratio , Young Adult
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