Predictors of depression outcomes among abstinent methamphetamine-dependent individuals exposed to an exercise intervention.

BACKGROUND AND OBJECTIVES: This paper expands on a study investigating depression outcomes in response to an 8-week exercise intervention among methamphetamine (MA) dependent individuals in early recovery. METHODS: A total of 135 MA-dependent individuals enrolled in residential treatment were randomly assigned to either a structured exercise intervention or a structured health education control group. Both groups were similar in format: 60-minute sessions, offered three times a week over an 8-week study period. RESULTS: Results showed that at the 8-week trial endpoint, participants randomized to the exercise intervention showed significantly greater reduction in depression symptom scores than participants randomized to the health education group, and that participants who attended the greatest number of exercise sessions derived the greatest benefit. This paper further analyzes study data to uncover individual predictors of depression response to exercise and finds that among participants randomized to exercise treatment, individuals with the most severe medical, psychiatric, and addiction disease burden at baseline showed the most significant improvement in depressive symptoms by study endpoint. CONCLUSIONS: Our findings suggest that exercise in moderate dose is effective at treating depressive symptoms in individuals in early recovery from addiction, and furthermore, that treatment with exercise appears to be particularly beneficial to individuals who suffer from severe medical, psychiatric, and addictive disorders.

Reinforcement Schedule Effects on Long-Term Behavior Change.

OBJECTIVE: The primary aim of this study was to determine whether different schedules of contingency management (CM), in conjunction with psychosocial treatment, produced different rates of abstinence and treatment attendance among individuals dependent on methamphetamine. METHODS: Individuals were randomized into 1 of 3 conditions that sought to equate total potential reinforcer magnitude while varying the frequency with which reinforcement was delivered, and comparing these results to those obtained when psychosocial support alone was used. RESULTS: Results indicate that all 3 CM schedules occasioned more abstinent attendance than the group only receiving psychosocial treatment. However, the 3 CM conditions did not differ in any appreciable way. CONCLUSIONS: These results suggest that treatment providers may be able to decrease the frequency of reinforcer delivery in CM paradigms while retaining efficacy to treat psychostimulant use disorders.

Craving among individuals with stimulant use disorder in residential social model-based treatment - Can exercise help?

BACKGROUND: In a randomized controlled 8-week trial, we examined the efficacy of aerobic and resistance exercise in reducing craving for methamphetamine (MA) among individuals with MA-use disorder during residential treatment. METHODS: Individuals with MA use disorder (138) who were newly enrolled in residential treatment volunteered for random assignment to either an 8-week exercise intervention (EX) or health education control (HE), with both conditions meeting 3 times weekly; 3 dropped out of the trial, bringing the analysis sample to 135. The majority of participants were male (80%), and 48% were Latino/Hispanic. The mean age of the sample was 31.7 (SD = 6.9) years. Using multivariate mixed models, differences between conditions were examined in: (1) craving for MA, measured by self-reported ratings on a Visual Analog Scale over the 8-week trial and, (2) MA use, measured by self-report and urine drug screens at baseline and 30 and 60 days after discharge from the 8-week study. RESULTS: Results revealed significantly lower craving scores among the participants in the EX group than those in the HE group over the 8-week trial (median daily craving score for EX = 13.5, for HE = 21.8; p = .009). In addition, participants with less craving during treatment had significantly lower rates of MA use after discharge than participants with high craving measured at 30-days (p = .004) and 60-days post-discharge (p < .001). CONCLUSIONS: Results support the utility of incorporating a structured exercise program for individuals with MA-use disorder to reduce craving and improve MA-use outcomes.

Effect of Exercise Training on Striatal Dopamine D2/D3 Receptors in Methamphetamine Users during Behavioral Treatment.

Methamphetamine use disorder is associated with striatal dopaminergic deficits that have been linked to poor treatment outcomes, identifying these deficits as an important therapeutic target. Exercise attenuates methamphetamine-induced neurochemical damage in the rat brain, and a preliminary observation suggests that exercise increases striatal D2/D3 receptor availability (measured as nondisplaceable binding potential (BPND)) in patients with Parkinson's disease. The goal of this study was to evaluate whether adding an exercise training program to an inpatient behavioral intervention for methamphetamine use disorder reverses deficits in striatal D2/D3 receptors. Participants were adult men and women who met DSM-IV criteria for methamphetamine dependence and were enrolled in a residential facility, where they maintained abstinence from illicit drugs of abuse and received behavioral therapy for their addiction. They were randomized to a group that received 1 h supervised exercise training (n=10) or one that received equal-time health education training (n=9), 3 days/week for 8 weeks. They came to an academic research center for positron emission tomography (PET) using [(18)F]fallypride to determine the effects of the 8-week interventions on striatal D2/D3 receptor BPND. At baseline, striatal D2/D3 BPND did not differ between groups. However, after 8 weeks, participants in the exercise group displayed a significant increase in striatal D2/D3 BPND, whereas those in the education group did not. There were no changes in D2/D3 BPND in extrastriatal regions in either group. These findings suggest that structured exercise training can ameliorate striatal D2/D3 receptor deficits in methamphetamine users, and warrants further evaluation as an adjunctive treatment for stimulant dependence.

Impact of an exercise intervention on methamphetamine use outcomes post-residential treatment care.

BACKGROUND: We examined the efficacy of an 8-week exercise intervention on posttreatment methamphetamine (MA) use among MA-dependent individuals following residential treatment. METHODS: 135 individuals newly enrolled in treatment were randomly assigned to a structured 8-week exercise intervention or health education control group. Approximately 1 week after completion of the intervention, participants were discharged to the community. Interview data and urine samples were collected at 1-, 3-, and 6-months post-residential care. Of the sample, 54.8% were classified as higher severity users (using MA more than 18 days in the month before admission) and 45.2% as lower severity users (using MA for up to 18 days in the month before admission). Group differences in MA use outcomes were examined over the 3 timepoints using mixed-multivariate modeling. RESULTS: While fewer exercise participants returned to MA use compared to education participants at 1-, 3- and 6-months post-discharge, differences were not statistically significant. A significant interaction for self-reported MA use and MA urine drug test results by condition and MA severity was found: lower severity users in the exercise group reported using MA significantly fewer days at the three post-discharge timepoints than lower severity users in the education group. Lower severity users in the exercise group also had a lower percentage of positive urine results at the three timepoints than lower severity users in the education group. These relationships were not present in the comparison of the higher severity conditions. CONCLUSION: Results support the value of exercise as a treatment component for individuals using MA 18 or fewer days/month.

The Impact of Exercise On Depression and Anxiety Symptoms Among Abstinent Methamphetamine-Dependent Individuals in A Residential Treatment Setting.

BACKGROUND: This paper reports data from a study designed to determine the impact of an 8-week exercise program on depression and anxiety symptoms among newly abstinent methamphetamine (MA)-dependent individuals in residential treatment. METHODS: One hundred thirty-five MA-dependent individuals, newly enrolled in residential treatment, were randomly assigned to receive either a 3-times-per-week, 60-minute structured exercise program for 8 weeks (24 sessions) or an equivalent number of health education sessions. Using mixed-modeling repeated-measures regression, we examined changes in weekly total depression and anxiety scores as measured by the Beck Depression Inventory and Beck Anxiety Inventory over the 8-week study period. RESULTS: Mean age of participants was 31.7 (SD = 6.9); 70.4% were male and 48% Latino. Analyses indicate a significant effect of exercise on reducing depression (ß = -0.63, P = 0.001) and anxiety (ß = -0.95, P=0.001) symptoms (total scores) over the 8-week period compared to a health education control group. A significant dose interaction effect between session attendance and exercise was found as well on reducing depression (ß = -0.61, P < 0.001) and anxiety symptoms (ß = -0.22, P=0.009) over time compared to the control group. CONCLUSIONS: Results support the role of a structured exercise program as an effective intervention for improving symptoms of depression and anxiety associated with MA abstinence.

Investigating the use of contingency management in the treatment of cocaine abuse among individuals with schizophrenia: a feasibility study.

This small-scale study was conducted to examine the feasibility of using voucher-based reinforcement therapy (VBRT) as a treatment modality for cocaine abuse among individuals with schizophrenia. Cocaine use was reduced in three individuals with a diagnosis of schizophrenia during a VBRT intervention. Interestingly, all of the abstinence occurred during the first half of the intervention. This early period of sobriety may represent a clinically relevant window of opportunity during which intensive psychosocial or social work interventions might have a greater chance for success.

Exercise for methamphetamine dependence: rationale, design, and methodology.

BACKGROUND: Effective pharmacotherapies to treat methamphetamine (MA) dependence have not been identified, and behavioral therapies are marginally effective. Based on behavioral studies demonstrating the potential efficacy of aerobic exercise for improving depressive symptoms, anxiety, cognitive deficits, and substance use outcomes, the study described here is examining exercise as a potential treatment for MA-dependent individuals. METHODS: This study is randomizing 150 participants with MA dependence at a residential treatment facility for addictive disorders to receive either a thrice-weekly structured aerobic and resistance exercise intervention or a health education condition. Recruitment commenced in March, 2010. Enrollment and follow-up phases are ongoing, and recruitment is exceeding targeted enrollment rates. CONCLUSIONS: Seeking evidence for a possibly effective adjunct to traditional behavioral approaches for treatment of MA dependence, this study is assessing the ability of an 8-week aerobic and resistance exercise protocol to reduce relapse to MA use during a 12-week follow-up period after discharge from residential-based treatment. The study also is evaluating improvements in health and functional outcomes during and after the protocol. This paper describes the design and methods of the study.

Exercise training improves heart rate variability after methamphetamine dependency.

PURPOSE: Heart rate variability (HRV) reflects a healthy autonomic nervous system and is increased with physical training. Methamphetamine dependence (MD) causes autonomic dysfunction and diminished HRV. We compared recently abstinent methamphetamine-dependent participants with age-matched, drug-free controls (DF) and also investigated whether HRV can be improved with exercise training in the methamphetamine-dependent participants. METHODS: In 50 participants (MD = 28; DF = 22), resting heart rate (HR; R-R intervals) was recorded over 5 min while seated using a monitor affixed to a chest strap. Previously reported time domain (SDNN, RMSSD, pNN50) and frequency domain (LFnu, HFnu, LF/HF) parameters of HRV were calculated with customized software. MD were randomized to thrice-weekly exercise training (ME = 14) or equal attention without training (MC = 14) over 8 wk. Groups were compared using paired and unpaired t-tests. Statistical significance was set at P ≤ 0.05. RESULTS: Participant characteristics were matched between groups (mean ± SD): age = 33 ± 6 yr; body mass = 82.7 ± 12 kg, body mass index = 26.8 ± 4.1 kg·min. Compared with DF, the MD group had significantly higher resting HR (P < 0.05), LFnu, and LF/HF (P < 0.001) as well as lower SDNN, RMSSD, pNN50, and HFnu (all P < 0.001). At randomization, HRV indices were similar between ME and MC groups. However, after training, the ME group significantly (all P < 0.001) increased SDNN (+14.7 ± 2.0 ms, +34%), RMSSD (+19.6 ± 4.2 ms, +63%), pNN50 (+22.6% ± 2.7%, +173%), HFnu (+14.2 ± 1.9, +60%), and decreased HR (-5.2 ± 1.1 bpm, -7%), LFnu (-9.6 ± 1.5, -16%), and LF/HF (-0.7 ± 0.3, -19%). These measures did not change from baseline in the MC group. CONCLUSIONS: HRV, based on several conventional indices, was diminished in recently abstinent, methamphetamine-dependent individuals. Moreover, physical training yielded a marked increase in HRV, representing increased vagal modulation or improved autonomic balance.

Duration effects in contingency management treatment of methamphetamine disorders.

The primary aim of this study was to determine whether different durations of contingency management (CM) in conjunction with psychosocial treatment produced different rates of abstinence among methamphetamine dependent individuals. Participants were randomized to one of the four 16-week treatment conditions: standard psychosocial treatment or psychosocial treatment plus one of the three durations of CM (one-month, two-month, or four-month). A total of 118 participants were randomized to the four treatment conditions. There were significant differences across treatment conditions for number of consecutive days of methamphetamine abstinence (p<0.05). These differences were in the hypothesized direction, as participants were more likely to remain abstinent through the 16-week trial as CM duration increased. A significant effect of treatment condition (p<0.05) and time (p<0.05) on abstinence over time was also found. Longer durations of CM were more effective for maintaining methamphetamine abstinence.

Eight weeks of exercise training improves fitness measures in methamphetamine-dependent individuals in residential treatment.

OBJECTIVES: Physical exercise has been shown to benefit diverse medical and behavioral conditions. This study assesses the feasibility and efficacy of an 8-week endurance and resistance training program on fitness measures in individuals undergoing residential treatment for methamphetamine (MA) dependence. METHODS: A total of 39 MA-dependent individuals were randomized to 3 days/week of exercise training (ET, n = 15) or health education without training (equal attention [EA], n = 14) over 8 weeks. Aerobic performance ((Equation is included in full-text article.)VO2max) was measured by indirect calorimetry, body composition by skinfolds, muscle strength by 1-repetition maximum (1-RM), and endurance at 85% of 1-RM for both leg press (LP) and chest press (CP). RESULTS: A total of 29 individuals completed the study for a 74% adherence rate. Baseline characteristics (mean ± SD) were balanced between groups: age 31 ± 7 years; height = 1.74 ± 0.07 m; weight 82.0 ± 15.0 kg. The ET group significantly improved (Equation is included in full-text article.)O2max by 0.63 ± 0.22 L/min (+21%), LP strength by 24.4 ± 5.6 kg (+40%), and CP strength by 20.6 ± 5.7 kg (+49%). The ET group increased LP and CP endurance by 120% and 96%, respectively and showed significant reductions in body weight of 1.7 ± 2.4 kg (-2%), % body fat of 2.8 ± 1.3% (-15%), and fat weight 2.8 ± 1.8 kg (-18%). All changes were significant (P < 0.001) for ET, and no changes were seen for the EA group. CONCLUSIONS: Individuals recovering from MA dependence showed substantial improvements in aerobic exercise performance, muscle strength and endurance, and body composition with ET. These findings demonstrate the feasibility of an ET intervention in these participants and also show excellent responsiveness to the exercise stimulus resulting in physiological changes that might enhance recovery from drug dependency.

Preference for gamma-hydroxybutyrate (GHB) in current users.

Gamma-hydroxybutyrate (GHB) is a drug with significant abuse potential. The present study aimed to assess the relative value of escalating doses of GHB to current GHB users via the Multiple Choice Procedure (MCP), and to validate that the dose rated highest with the MCP would be self-administered at a greater rate than placebo. Participants were 5 current GHB users who were not currently trying to stop using GHB. To examine the value of escalating doses of GHB, the following doses of GHB were used: 0 (placebo), 12.5, 25, 37.5, and 50 mg/kg. Participants typically assigned higher doses of GHB had higher crossover points on the MCP. During choice sessions, participants made repeated choices between administering GHB, placebo or nothing. All participants selected GHB exclusively (5 out of 5 instances) except for one participant who selected GHB on 4 out of 5 instances, thus 96% (i.e., 24/25) of choices were for active GHB. Based on these data, GHB appears likely to function as a dose-dependent reinforcer for humans based on our sample.

Potential sources of reinforcement and punishment in a drug-free treatment clinic: client and staff perceptions.

Contingency management interventions are quite successful at initiating abstinence from drugs of abuse. However, these approaches to drug abuse treatment are often criticized because of their perceived cost. One way to reduce the cost of contingency management interventions would be to use nonmonetary sources of reinforcement or punishment. A number of reports have discussed the availability of potential sources of reinforcement in opiate replacement clinics. This report describes the availability of potential sources of reinforcement and punishment available in drug-free treatment programs. Both clients and clinic staff rated a number of items in terms of their potential reinforcing and punishing efficacy. Results suggest that there are several sources of reinforcement and punishment available in drug-free clinics, which could be used in contingency management programs. The results also suggest that the clinic staff perceives potential sources of punishment as more aversive than do the clients.

A comparison of voucher exchanges between criminal justice involved and noninvolved participants enrolled in voucher-based contingency management drug abuse treatment programs.

This report compares requests for goods or services made by participants in two clinical trials of contingency management for the treatment of substance abuse. One trial was for participants involved with the criminal justice system and one was for participants who were not involved with the criminal justice system. In both trials, participants earned vouchers that could be exchanged for goods or services. Results indicated that the criminal justice group used the majority of their vouchers for paying fees or fines related to the criminal justice system while the other group used only a small portion of their vouchers for paying costs related to the criminal justice system. However, when the costs for the criminal justice system are removed, the proportion of vouchers exchanged for various goods and services are similar between the two groups. The results suggest that for those substance abusers involved in the criminal justice system, assistance in paying fines and fees related to their criminal justice system involvement may be a potentially powerful source of reinforcement that could be used in creative treatment strategies.

Relationship between Tridimensional Personality Questionnaire scores and clinic attendance among cocaine abusing, buprenorphine maintained outpatients.

With the recent approval of buprenorphine for the treatment of opiate dependence in the United States it has become important to develop an understanding of the factors that influence the likelihood of successful treatment outcomes when using buprenorphine. This study examined, in a convenience sample, the relationship between novelty-seeking behaviors, as determined by Cloninger's Tridimensional Personality Questionnaire (TPQ), and attendance variables during participation in a buprenorphine-based treatment program for 21 heroin-dependent cocaine users that took place in the late 1990s. Approximately two-thirds of the participants were male and primarily African-American. About half of them were employed and had at least a high school education. Approximately one-third of them were married or cohabitating and they all resided in the greater Detroit, Michigan area of the United States. The Tridimensional Personality Questionnaire (TPQ) was administered to the participants prior to entering the treatment program. Demographic variables, psychiatric distress, and substance use severity were also evaluated. Variables with significant bivariate relationships with poor attendance measures were entered into a regression analysis predicting attendance measures. Participants who scored high on the TPQ Novelty Seeking Scale attended significantly fewer regularly scheduled visits, had a greater overall number of missed visits, and shorter treatment retention times. Demographics, substance use severity, and psychiatric distress did not have significant relationships with these attendance measures.