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1.
NPJ Breast Cancer ; 9(1): 51, 2023 Jun 08.
Artigo em Inglês | MEDLINE | ID: mdl-37291235

RESUMO

Adjuvant chemotherapy recommendations for ER+/HER2- early-stage breast cancers (eBC) involve integrating prognostic and predictive information which rely on physician judgment; this can lead to discordant recommendations. In this study we aim to evaluate whether Oncotype DX improves confidence and agreement among oncologists in adjuvant chemotherapy recommendations. We randomly select 30 patients with ER+/HER2- eBC and recurrence score (RS) available from an institutional database. We ask 16 breast oncologists with varying years of clinical practice in Italy and the US to provide recommendation for the addition of chemotherapy to endocrine therapy and their degree of confidence in the recommendation twice; first, based on clinicopathologic features only (pre-RS), and then with RS result (post-RS). Pre-RS, the average rate of chemotherapy recommendation is 50.8% and is higher among junior (62% vs 44%; p < 0.001), but similar by country. Oncologists are uncertain in 39% of cases and recommendations are discordant in 27% of cases (interobserver agreement K 0.47). Post-RS, 30% of physicians change recommendation, uncertainty in recommendation decreases to 5.6%, and discordance decreases to 7% (interobserver agreement K 0.85). Interpretation of clinicopathologic features alone to recommend adjuvant chemotherapy results in 1 out of 4 discordant recommendations and relatively high physician uncertainty. Oncotype DX results decrease discordancy to 1 out of 15, and reduce physician uncertainty. Genomic assay results reduce subjectivity in adjuvant chemotherapy recommendations for ER +/HER2- eBC.

2.
JCO Oncol Pract ; 19(6): e927-e934, 2023 06.
Artigo em Inglês | MEDLINE | ID: mdl-36534931

RESUMO

PURPOSE: Conventional hematology/oncology fellowship training is designed to foster careers in academic practice through intensive exposure to clinical and laboratory research. Even so, a notable proportion of graduating fellows opt to pursue a clinically focused career outside the realm of academic medicine. Given the corresponding shortage of oncologists in nonurban and rural settings, improving the representation of hematologists/oncologists in the community setting is a national priority. METHODS: We reviewed current national challenges and changing models of cancer care delivery in the context of the traditional academic training model along with trends in practice patterns for recent hematology/oncology graduates. We defined the Academic-Community hybrid (ACH) and how it supports the evolution in contemporary models of cancer care. We then drew on the authors' experiences to formulate an innovative goal-concordant training paradigm for fellows seeking careers in the ACH model. RESULTS: The ACH hematology/oncology fellowship training pathway emphasizes and optimizes professional development domains including clinical care, patient safety and quality improvement, business and operations, cancer care equity and community access, healthy policy and alignment with professional organizations, and medical education. CONCLUSION: This novel hematology/oncology training model provides a paradigm for optimizing preparedness for practice in an increasingly complex cancer care delivery environment while addressing workforce shortages and health disparities.


Assuntos
Escolha da Profissão , Bolsas de Estudo , Humanos , Educação de Pós-Graduação em Medicina , Atenção à Saúde , Oncologia/educação
3.
J Psychiatr Res ; 155: 572-578, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-36206601

RESUMO

BACKGROUND: Treatment Resistant Schizophrenia (TRS) is the persistence of significant symptoms despite adequate antipsychotic treatment. Although consensus guidelines are available, this condition remains often unrecognized and an average delay of 4-9 years in the initiation of clozapine, the gold standard for the pharmacological treatment of TRS, has been reported. We aimed to determine through a machine learning approach which domain of the Positive and Negative Syndrome Scale (PANSS) 5-factor model was most associated with TRS. METHODS: In a cross-sectional design, 128 schizophrenia patients were classified as TRS (n = 58) or non-TRS (n = 60) after a structured retrospective-prospective analysis of treatment response. The random forest algorithm (RF) was trained to analyze the relationship between the presence/absence of TRS and PANSS-based psychopathological factor scores (positive, negative, disorganization, excitement, and emotional distress). As a complementary strategy to identify the variables most associated with the diagnosis of TRS, we included the variables selected by the RF algorithm in a multivariate logistic regression model. RESULTS: according to the RF model, patients with higher disorganization, positive, and excitement symptom scores were more likely to be classified as TRS. The model showed an accuracy of 67.19%, a sensitivity of 62.07%, and a specificity of 71.43%, with an area under the curve (AUC) of 76.56%. The multivariate model including disorganization, positive, and excitement factors showed that disorganization was the only factor significantly associated with TRS. Therefore, the disorganization factor was the variable most consistently associated with the diagnosis of TRS in our sample.


Assuntos
Antipsicóticos , Clozapina , Esquizofrenia , Antipsicóticos/farmacologia , Antipsicóticos/uso terapêutico , Clozapina/farmacologia , Estudos Transversais , Humanos , Aprendizado de Máquina , Estudos Retrospectivos , Esquizofrenia/diagnóstico , Esquizofrenia/tratamento farmacológico , Esquizofrenia Resistente ao Tratamento
4.
Clin Oncol Res ; 3(6): 1-11, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34142081

RESUMO

BACKGROUND: The impact of the COVID-19 pandemic has spread beyond those infected with SARS-CoV-2. Its widespread consequences have affected cancer patients whose surgeries may be delayed in order to minimize exposure and conserve resources. METHODS: Experts in each surgical oncology subspecialty were selected to perform a review of the relevant literature. Articles were obtained through PubMed searches in each cancer subtype using the following terms: delay to surgery, time to surgery, outcomes, and survival. RESULTS: Delays in surgery > 4 weeks in breast cancer, ductal carcinoma in situ, T1 pancreatic cancer, ovarian cancer, and pediatric osteosarcoma, negatively impacted survival. Studies on hepatocellular cancer, colon cancer, and melanoma (Stage I) demonstrated reduced survival with delays > 3 months. CONCLUSION: Studies have shown that short-term surgical delays can result in negative impacts on patient outcomes in multiple cancer types as well as in situ carcinoma. Conversely, other cancers such as gastric cancer, advanced melanoma and pancreatic cancer, well-differentiated thyroid cancer, and several genitourinary cancers demonstrated no significant outcome differences with surgical delays.

6.
Schizophr Res ; 202: 217-225, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-29934250

RESUMO

Treatment resistant schizophrenia (TRS) is defined by poor or non-response to conventional antipsychotic agents. Functional capacity is defined as the baseline potential of a patient to function in the community, irrespective of actual achievements gained, and has never been studied in TRS. Here, we screened 182 patients with psychotic symptoms and separated them in TRS (n = 28) and non-TRS (n = 32) ones, to evaluate whether they exhibited differential extents and predictive clinical variables of functional capacity. Functional capacity was measured by the UCSD Performance-Based Skills Assessment (UPSA). Psychotic symptoms by PANSS, social functioning by PSP and SLOF, clinical severity of the illness, cognitive functioning, and neurological soft signs (NSS) were assessed. TRS patients had non-significant lower UPSA scores compared to non-TRS (t-test: p > 0.05). In TRS, UPSA score correlated with multiple clinical variables. The highest effect sizes were observed for PANSS negative score (r = -0.67, p < 0.005); SLOF Area1 score (r = 0.66, p < 0.005); NSS severity (r = -0.61, p < 0.005). Multivariate analysis showed that main predictors of UPSA score in TRS patients were PANSS negative score, education years, NSS, Problem Solving performances, and PSP score (F = 11.12, R2 = 0.75, p < 0.0005). These variables were not predictive of UPSA score in non-TRS patients. Hierarchical analysis found that variance in UPSA score mainly depended on negative symptoms, NSS, and problem solving (F = 15.21, R2 = 0.65, p < 0.0005). Path analysis individuated two separate paths to UPSA score. These results delineate a limited and independent group of candidate predictors to be putatively accounted for therapeutic interventions to improve functional capacity, and possibly social functioning, in TRS patients.


Assuntos
Esquizofrenia/diagnóstico , Esquizofrenia/tratamento farmacológico , Psicologia do Esquizofrênico , Adulto , Antipsicóticos/uso terapêutico , Estudos Transversais , Resistência a Medicamentos , Feminino , Humanos , Masculino , Testes Neuropsicológicos , Índice de Gravidade de Doença
7.
Riv Psichiatr ; 53(1): 31-39, 2018.
Artigo em Italiano | MEDLINE | ID: mdl-29493652

RESUMO

AIMS: Managing health care for people suffering from mental illness is undergoing deep changes in recent years in Italy. The purpose of this study is to describe the progressive process of overcoming the Forensic Hospitals in Italy (OPGs) and to identify the necessary care and rehabilitation pathways in this process, in the experience of the territorial health service in Salerno, Italy. METHODS: An analysis of the recent laws related to the ongoing process and an analysis of epidemiological and structural data referring to the time interval between 2010 and 2017 concerning the OPGs/Residential Services for the Execution of Security Measures (RSESM)/Mental Health System in Campania, Italy and in the territory of Salerno in particular. RESULTS: The acts governing the transition from OPG to RSESM include DPCM 1/4/2008 and subsequent "Conferenza Unificata" agreements, other laws and regional health organizational regulations. A thorough restructuring of the National Health Service is required. A substantial path in Campania has been completed, with the closure of OPGs, the realization of definitive RSESM, the Departments for Mental Health Care in prison, the Regional Technical Group for overcoming the OPGs, the territorial Services for overcoming the OPGs and for Mental Health in Prison. The result of these transformations is a deep change in the health care approach, as evidenced by the current changes in action in indicative parameters of care pathways and their outcomes. CONCLUSIONS: The new approach shows both improvement features and totally or partially unaddressed problematic features. As for the actual management issues, improvements in communication between Mental Health Care and the magistracy. The overall evaluation of the transformations in progress is positive. At this stage, it is crucial to identify and monitor indicators of the pathways of care and their outcomes and to implement synergies among the systems involved.


Assuntos
Criminosos , Atenção à Saúde/organização & administração , Hospitais Psiquiátricos , Serviços de Saúde Mental/organização & administração , Medidas de Segurança , Feminino , Humanos , Itália , Masculino
8.
Psychiatry Res ; 249: 159-166, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28104562

RESUMO

The present study evaluated consistency, reliability, and determinants of two real-world measures of adherence to prescription in 57 schizophrenia and 61 non-schizophrenia patients. Treatment resistant schizophrenia (TRS) was additionally diagnosed in 28 of the schizophrenia patients. Patients were screened for clinical severity, cognitive functioning, and adherence by 10-item Drug Attitude Inventory (DAI-10) or Adherence-to-Therapy (AtT), a clinician-rated tool developed by our group. DAI-10 and AtT scores showed a significant correlation (p=0.039; ρ=0.21; df=103). Compared to the DAI-10 scale, a higher number of variables were associated with AtT. In schizophrenia and TRS patients, substance abuse was the only significant predictor of lower DAI-10 score (p=0.027, F=5.2, R2=0.07, and p=0.06, F=8.9, R2=0.23, respectively). Lower AtT score was significantly associated with first-generation antipsychotic use (p=0.001, RR: 2.00 [1.40-2.87]), positive symptoms (p=0.02, RR: 1.63 [1.05-2.53]), impaired verbal fluency (p=0.01, RR: 1.88 [0.81-4.32]) or problem solving (p=0.01, RR: 2.14 [0.92-4.98]). AtT, but not DAI-10, score correlated with the score on the Personal and Social Performance scale (p=0.02, F=5.86, R2=0.08). Overall, AtT score was predicted by pharmacological, psychopathological, and cognitive factors, and predictive of psychosocial functioning. Therefore, AtT measure may represent a convenient and practical tool to evaluate schizophrenia patients' adherence.


Assuntos
Antipsicóticos/uso terapêutico , Adesão à Medicação/psicologia , Esquizofrenia/tratamento farmacológico , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Esquizofrenia/diagnóstico , Psicologia do Esquizofrênico , Índice de Gravidade de Doença , Resultado do Tratamento
9.
Curr Opin Obstet Gynecol ; 29(1): 12-17, 2017 02.
Artigo em Inglês | MEDLINE | ID: mdl-27977463

RESUMO

PURPOSE OF REVIEW: Approximately 1 in 8 US women (12%) will develop invasive breast cancer over the course of her lifetime. In 2016, an estimated 246,660 new cases of invasive breast cancer are expected to be diagnosed and approximately 40,450 would die as a result of it. The global burden of breast cancer exceeds all other cancers and the incidence is increasing. The heterogeneity of breast cancer makes it a challenging solid tumor to diagnose and treat. This review focuses on the recent advances in breast cancer therapy including hormonal treatment of metastatic breast cancer, targeting cyclin-dependent kinases (CDK) 4/6 in breast cancer, updates in targeting human epidermal growth factor receptor 2 (HER2) positive breast cancer, adaptive randomization trial design and cancer genetic risk assessment. RECENT FINDINGS: Breast cancer is a heterogeneous disease and targeted therapy is improving the outcomes of women. The use of cyclin-dependent kinase inhibitors (CDK) 4/6 have demonstrated a substantial improvement in progression-free survival in the first line setting of metastatic hormone receptor positive breast cancer. And newer agents directed at HER2 continue to revolutionize HER2-positive breast cancer treatment. SUMMARY: This review highlights the recent updates in breast cancer treatment, new concepts in clinical trial design and provides a current overview of cancer genetic risk assessment.


Assuntos
Antineoplásicos Hormonais/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Quinases Ciclina-Dependentes/antagonistas & inibidores , Receptor ErbB-2/antagonistas & inibidores , Ensaios Clínicos Adaptados como Assunto/tendências , Antineoplásicos/uso terapêutico , Neoplasias da Mama/patologia , Neoplasias da Mama/secundário , Quinase 4 Dependente de Ciclina/antagonistas & inibidores , Quinase 6 Dependente de Ciclina/antagonistas & inibidores , Projetos de Pesquisa Epidemiológica , Feminino , Testes Genéticos/tendências , Humanos , Ensaios Clínicos Controlados Aleatórios como Assunto , Medição de Risco/tendências
10.
J Adolesc Young Adult Oncol ; 5(4): 337-343, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27513691

RESUMO

PURPOSE: Mutations in the BRCA1/2 genes are associated with breast and ovarian cancer susceptibility. Recent studies have suggested that the BRCA mutation might be associated with occult primary ovarian insufficiency. To evaluate fertility, several studies have validated anti-Mullerian hormone (AMH) as a direct biomarker for ovarian aging and it is considered a quantitative marker of ovarian reserve. We hypothesize that BRCA1 gene mutations will be negatively associated with AMH levels. METHODS: We evaluated 124 women aged 18-45 years participating in the Northwestern Ovarian Cancer Early Detection and Prevention Program. Patients with a history of cancer, ovarian surgery, or exposure to chemotherapy were excluded. Linear and logistic regression modeling were performed to evaluate the association between AMH levels, age, and BRCA1 mutation. In logistic models, the outcome 'low AMH' was defined as AMH <0.05 ng/mL. Logistic regression models were used to adjust for other factors, including body mass index (BMI), duration of birth control (BC), smoking, gravidity, and parity. RESULTS: Women with the BRCA1 mutation had a significant decline in AMH with age (p = 0.0011). BRCA1-positive women >35 years had 10 times the odds of a low AMH (<0.5 ng/mL) compared with women ≤35 years. With adjustment for BMI, duration of BC, smoking, gravidity, parity, and age >35, BRCA1 was still strongly associated with a low AMH (p = 0.037). CONCLUSION: Women >35 with the BRCA1 mutation have a lower AMH, and hence ovarian reserve, than women without a BRCA mutation. Therefore, young adults with the BRCA1 mutation should be counseled regarding this potential decrease in ovarian reserve.


Assuntos
Proteína BRCA1/genética , Neoplasias da Mama/genética , Infertilidade/etiologia , Neoplasias Ovarianas/genética , Reserva Ovariana/genética , Adolescente , Adulto , Neoplasias da Mama/complicações , Feminino , Humanos , Pessoa de Meia-Idade , Mutação , Neoplasias Ovarianas/complicações , Adulto Jovem
11.
Artigo em Inglês | MEDLINE | ID: mdl-26320028

RESUMO

The aim of this work was to compare achievements in milestones of community functioning in highly disabling psychiatric conditions, including treatment resistant schizophrenia (TRS), schizophrenia (responsive to antipsychotics), bipolar disorder, and anxiety/depressive diseases. Also, we investigated the predictors of community functioning outcomes across several domains. Among consecutive patients screened, 188 met inclusion criteria and 118 ultimately entered the study. Diagnosis of TRS was made by stringent criteria, including historic and perspective evaluations and excluding potential confounding factors. Achievements in functional milestones of everyday living were recorded. Performances in discrete cognitive tasks were assessed. The Positive and Negative Syndrome Scale, the Personal and Social Performance Scale, the Drug Attitude Inventory-10, and the Quality of Life Enjoyment and Satisfaction Questionnaire were administered. TRS patients showed the highest impairment in community functioning among diagnostic groups. TRS was found to have more severe psychopathology, more impaired cognitive functioning, and poorer psychosocial adjustment compared to all the other groups. In the whole sample, the main predictors of community functioning were the diagnostic group (with TRS diagnosis associated with worst functioning) and achievements in the other functional milestones. In psychotic patients, however, the main predictors of community functioning were clinical and psychopathological variables. These results may support the hypothesis that TRS represents a separate schizophrenia subtype, with its own neurobiology, psychopathology and clinical course. Our results identify a group of modifiable predictors to be addressed to prevent community disability.


Assuntos
Esquizofrenia/tratamento farmacológico , Esquizofrenia/epidemiologia , Psicologia do Esquizofrênico , Comportamento Social , Logro , Adulto , Antipsicóticos/uso terapêutico , Transtornos de Ansiedade/epidemiologia , Transtorno Bipolar/epidemiologia , Cognição , Estudos Transversais , Transtorno Depressivo/fisiopatologia , Resistência a Medicamentos , Emprego , Feminino , Humanos , Masculino , Estado Civil , Escalas de Graduação Psiquiátrica , Qualidade de Vida , Índice de Gravidade de Doença , Resultado do Tratamento
12.
Breast Cancer Res Treat ; 151(3): 629-38, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-26006067

RESUMO

The purpose of this study is to evaluate the efficacy and safety of neoadjuvant treatment with carboplatin and eribulin in patients with early-stage triple negative breast cancer (TNBC), and to explore biomarkers based on DNA and protein expression profiles as predictors of response. Patients with histologically confirmed early-stage TNBC received carboplatin AUC 6 iv every 21 days, and eribulin 1.4 mg/m(2) day 1 and day 8 every 21 days for four cycles. The primary endpoint of the study was pathologic complete response (pCR), with secondary endpoints including clinical response and safety of the combination. Exploratory studies assessed DNA-based biomarkers [homologous recombination deficiency (HRD) score, and HR deficiency status (HRD score + BRCA1/BRCA2 mutation status)], protein-based biomarkers (Ki67, TP53, androgen receptor, Cyclin E, CDK2, Cyclin D, CDK4, Pin1 and Smad3), and clinical pretreatment factors as predictors of pCR. 13/30 (43.3 %) patients enrolled in the study achieved pCR. 24 (80.0 %) had a clinical complete or partial response. The combination was safe with mostly grade 1 and 2 toxicities. HRD score (P = 0.0024) and HR deficiency status (P = 0.0012) significantly predicted pCR. Pretreatment cytoplasmic CDK2 was also associated with pCR (P = 0.021). Significant differences in pre- versus post-treatment expression levels of nuclear Cyclin D (P = 0.020), nuclear CDK4 (P = 0.0030), and nuclear Smad3 (P = 0.015) were detected. The combination of carboplatin and eribulin is safe and efficacious in the treatment of early-stage TNBC. HRD score, HR deficiency status, and cytoplasmic CDK2 predicted pCR in this patient population.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Neoplasias de Mama Triplo Negativas/patologia , Adulto , Idoso , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Biomarcadores , Carboplatina/administração & dosagem , Feminino , Furanos/administração & dosagem , Genes BRCA1 , Genes BRCA2 , Humanos , Estimativa de Kaplan-Meier , Cetonas/administração & dosagem , Pessoa de Meia-Idade , Mutação , Terapia Neoadjuvante , Gradação de Tumores , Estadiamento de Neoplasias , Razão de Chances , Resultado do Tratamento , Neoplasias de Mama Triplo Negativas/genética , Neoplasias de Mama Triplo Negativas/metabolismo , Neoplasias de Mama Triplo Negativas/mortalidade
13.
Neuropsychiatr Dis Treat ; 9: 1113-20, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23950651

RESUMO

Tobacco smoking is common in schizophrenia patients. It has been reported that schizophrenia patients who are tobacco smokers have better cognitive performances compared to those who are nonsmokers. However, little is known on the effects of tobacco smoking in treatment-resistant schizophrenia (TRS) patients. The aim of this study was to compare cognitive performances, psychotic symptoms, and social adjustment in tobacco smoker TRS patients compared to nonsmoker TRS patients. Smoker and nonsmoker TRS patients did not differ in demographics and in mean daily antipsychotic dose. Smoker TRS patients had significantly higher scores than nonsmoker patients on the positive and negative syndrome scale (PANSS) and on the negative symptoms subscale. These patients also performed worse than nonsmoker patients on problem-solving cognitive domain. Social adjustment was not significantly different between the two groups. In both groups of patients, worse cognitive performances were mostly predicted by higher severity of negative symptoms. Worse performances on the verbal memory and problem-solving cognitive domains were correlated with social-functioning impairment in tobacco smoker TRS patients but not in nonsmoker ones. The results showed that tobacco smoking was not significantly associated with better cognitive performances in TRS patients, while it was significantly associated with higher negative symptoms. Even if a direct causative mechanism cannot be inferred and despite the fact that these patients may use tobacco to self-medicate, it could be speculated that these associations may, at least partially, be related to a tobacco-smoking-induced worsening of abnormal dopamine dysfunction, which has been suggested to occur in TRS patients.

14.
Psychiatry Res ; 210(2): 387-95, 2013 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-23910239

RESUMO

Multiple lines of evidence demonstrate that schizophrenia patients may perform worse than normal controls in several cognitive tasks. However, little is known on putative differences in cognitive functioning between schizophrenia patients responding to antipsychotics and those resistant to the treatment. In this cross-sectional study, 63 subjects (41 schizophrenia and schizoaffective patients and 22 age and sex-matched controls) were enrolled. Patients were divided in resistant (TRS, n=19) and non-resistant to pharmacological treatment (non-TRS, n=22) according to the American Psychiatric Association (APA) criteria for treatment resistance. The Brief Assessment of Cognition in Schizophrenia (BACS) was administered to patients and controls. The following rating scales were administered to schizophrenia patients: the Positive and Negative Syndrome Scale (PANSS), the Drug Attitude Inventory (DAI) and the Subjective Well-being under Neuroleptics (SWN). Statistically significant differences among non-TRS patients, TRS ones, and controls were detected at the BACS. TRS patients performed significantly worse than non-TRS ones on Verbal Memory task, exhibited higher PANSS total and subscales scores and were prescribed higher antipsychotic doses. Poorer performances at the BACS significantly correlated with more severe negative symptoms in TRS but not in non-TRS patients. These results may suggest that TRS patients suffer from a form of the disease with prominent cognitive impairment possibly related to negative symptoms.


Assuntos
Antipsicóticos/uso terapêutico , Transtornos Cognitivos/psicologia , Cognição , Psicopatologia , Transtornos Psicóticos/diagnóstico , Esquizofrenia/tratamento farmacológico , Adulto , Idoso , Estudos de Casos e Controles , Transtornos Cognitivos/diagnóstico , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Testes Neuropsicológicos/estatística & dados numéricos , Transtornos Psicóticos/psicologia , Esquizofrenia/diagnóstico , Psicologia do Esquizofrênico , Adulto Jovem
15.
J Appl Biomech ; 25(4): 330-9, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-20095454

RESUMO

The purpose of this study was to investigate the end-point force trajectories of the fibularis longus (FIB), lateral gastrocnemius (LG), and medial gastrocnemius (MG) muscles. Most information about individual muscle function has come from studies that use models based on electromyographic (EMG) recordings. In this study (N = 20 subjects) we used electrical stimulation (20 Hz) to elicit activity in individual muscles, recorded the end-point forces at the foot, and verified the selectivity of stimulation by using magnetic resonance imaging. Unexpectedly, no significant differences were found between LG and MG force directions. Stimulation of LG and MG resulted in downward and medial or lateral forces depending on the subject. We found FIB end-point forces to be significantly different from those of LG and MG. In all subjects, stimulation of FIB resulted in downward and lateral forces. Based on our results, we suggest that there are multiple factors determining when and whether LG or MG will produce a medial or lateral force and FIB consistently plays a significant role in eversion/abduction and plantar flexion. We suggest that the intersubject variability we found is not simply an artifact of experimental or technical error but is functionally relevant and should be addressed in future studies and models.


Assuntos
Articulação do Tornozelo/fisiologia , Estimulação Elétrica/métodos , Contração Isométrica/fisiologia , Músculo Esquelético/fisiologia , Equilíbrio Postural/fisiologia , Adolescente , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Músculo Esquelético/inervação , Estresse Mecânico , Adulto Jovem
16.
Physiol Behav ; 80(2-3): 385-94, 2003 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-14637239

RESUMO

The relative playfulness of inbred Lewis and Fischer-344 rats was characterized. Fischer rats were consistently less playful than Lewis rats, with rats of this strain less likely to initiate playful interactions with either responsive or unresponsive partners and also less likely to respond playfully when playful solicitations were directed to them. While less playful, Fischer rats were more socially inquisitive than Lewis rats when tested with an unresponsive partner, suggesting that Fischer rats are less likely to escalate a social encounter into a playful one. Strain differences in playful responsiveness were present with or without prior social isolation, suggesting that this aspect of play represents a relatively stable trait difference. Unlike play responsiveness, strain differences in play solicitation were only apparent after a period of social isolation. Low levels of play were still present in Fischer rats that had been reared by Lewis dams, suggesting a genetic source for the altered play in rats of this strain. Further studies of play behavior in Lewis and Fischer rats could illuminate relevant neural involvement in rough-and-tumble play and also help understand the genetic bases for this complex social behavior.


Assuntos
Envelhecimento , Comportamento Animal/fisiologia , Animais , Animais Recém-Nascidos , Feminino , Variação Genética , Masculino , Comportamento Materno/fisiologia , Atividade Motora , Gravidez , Probabilidade , Ratos , Ratos Endogâmicos F344 , Ratos Endogâmicos Lew , Ratos Sprague-Dawley , Seleção Genética , Especificidade da Espécie
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