Methods for treating cognitive deficits in schizophrenia

Effect of a motivational group intervention upon exercise self efficacy and outcome expectations for exercise in Schizophrenia Spectrum Disorders (SSDs)

BACKGROUND

Persons with SSDs contend with multiple barriers to exercise. Interventions are needed to enhance attitudes theoretically linked to exercise behavior.

OBJECTIVE

Examine effect of Walk, Address Sensations, Learn About Exercise, Cue Exercise for SSDs (WALC-S) intervention upon exercise self efficacy (SEE) and outcome expectations (OEES) in 97 outpatients with SSDs.

DESIGN

Experimental, pre test posttest. Randomization to experimental (WALC-S) or time-and-attention control (TAC) after baseline SEE and OEES measures. Measures repeated after WALC-S or TAC.

RESULTS

N = 97, 46% female, 43% African American, average age 46.9 years (SD = 2.0). Mean SEE scores were significantly higher in WALC-S participants after intervention (F ((1,95)) = 5.92, p = 0.0168), however, mean OEES scores were significantly higher in control participants after intervention (F ((1,95)) = 5.76, p = 0.0183.

CONCLUSION

This is the first study to examine SEE and OEES in SSDs. Interventions to enhance exercise attitudes are a critical first step toward the ultimate goal of increasing exercise participation.

Feasibility of the Walk, Address, Learn and Cue (WALC) Intervention for schizophrenia spectrum disorders

The WALC intervention was designed to motivate exercise in the elderly. Persons with schizophrenia spectrum disorders (SSDs) face similar exercise barriers. We described theoritical underpinnings of the WALC intervention and how we adapted it for SSDs. We conducted a feasibility study of the adapted intervention in 17 persons with SSDs. The adapted intervention incorporated low intensity stretches, exercise education and exercise cues. The intervention was feasible and acceptable to participants; approximately two-thirds of all groups were attended and nearly half of participants attended at least 75% of groups. Follow up studies should examine the effect of the intervention upon future exercise behavior, with the goal of identifying evidence based interventions to increase exercise in this group.

Motivating Persons with Schizophrenia Spectrum Disorders to Exercise: Rationale and Design

Persons with schizophrenia spectrum disorders (SSDs) are not only at risk because of disabling disease symptoms but because necessary medications create health risks associated with high rates of obesity. Despite the well-known benefits of exercise, persons with SSDs rarely adhere to such regimens; few interventions to motivate exercise behavior have been tested in this group.The purpose of this study is to examine effects of the Walk, Address sensations, Learn about exercise, Cue exercise behavior for persons with SSDs (WALC-S) motivational intervention upon exercise behavior. We will recruit a total of eighty outpatients 18-68 years, meeting these criteria: 1) chart diagnosis of schizophrenia, any subtype, schizoaffective disorder or schizophreniform disorder, according to the criteria described in the Diagnostic and Statistical Manual for Mental Disorders, 2) English speaking, 3) Stable medication regimen (defined as no medication changes within the last month), and 4) medical clearance for moderate exercise in writing from primary care provider. Participants will be randomly assigned to the experimental (4-week WALC-S motivational intervention), or the control group (4-week time and attention control). After the first 4 weeks, all participants will attend a 16-week walking group.The primary measures of the effectiveness of the WALC-S are attendance, persistence and compliance to the 16-week walking group. The study will be completed in approximately January 2010. In addition to hypothesis testing, this study will provide information to estimate effect sizes to calculate power and determine appropriate sample sizes for future inquiries. This paper describes the rationale and design of the study.

Identification of a series of benzoxazoles as potent 5-HT6 ligands

As part of our continuing efforts to identify therapeutics for CNS diseases such as schizophrenia and Alzheimer's disease (AD), we have been focused on the 5-HT(6) receptor in order to identify potent and selective ligands as a potential treatment for cognitive dysfunction. Herein we report the identification of a novel series of benzoxazole derivatives as potent 5-HT(6) ligands. The synthesis and detailed SAR of this class of compounds are reported. The compounds have been shown to be full antagonists in a cyclic AMP functional assay.

Disturbances in social interaction occur along with pathophysiological deficits following sub-chronic phencyclidine administration in the rat

A sub-chronic administration of phencyclidine to the rat brings about enduring pathophysiological and cognitive changes that resemble some features of schizophrenia. The present study aimed to determine whether the behavioural consequence of this phencyclidine regime extends to a long-term disruption of social interaction that might provide a parallel with some negative symptoms of the disease. Rats were treated with phencyclidine (2mg/kg bi-daily for 1 week) or vehicle followed by a drug-free period. Social interaction was assessed 24h, 1 week, 3 weeks and 6 weeks post-treatment. A long-lasting disturbance of social behaviour was observed in the phencyclidine group, namely more contact and non-contact interaction with an unfamiliar target rat at all time points. Six weeks post-phencyclidine, analysis of brains showed a reduction in expression of parvalbumin immunoreactive neurons in the hippocampus with significant reductions localised to the CA1 and dentate gyrus regions. These results show that sub-chronic phencyclidine produces long-lasting disruptions in social interaction that, however, do not model the social withdrawal seen in patients with schizophrenia. These disturbances of social behaviour may be associated with concurrent pathophysiological brain changes.