A study of the relationships between rumination, anger rumination, aggressive script rehearsal, and aggressive behavior in a sample of incarcerated adult males.

OBJECTIVE: This study explored relationships between aggressive script rehearsal, rumination, and anger rumination with aggressive behavior. METHOD: One hundred and twenty-nine incarcerated males (M = 33.54, SD = 8.67) completed the Schedule of Imagined Violence, Preservative Thinking Questionnaire, Anger Rumination Scale, and the Life History of Aggression-Aggression subscale. Correlations were run to examine associations between the variables and a four-step sequential multiple regression was performed to assess for the unique contribution of rumination, anger rumination, and aggressive script rehearsal to aggressive behavior. RESULTS: Results revealed moderate-strong positive associations between aggressive script rehearsal, rumination, and anger rumination. Moderate-weak associations were found between these three constructs and aggressive behavior. Regression analyses revealed aggressive script rehearsal was uniquely related with aggressive behavior and path analysis demonstrated aggressive script rehearsal mediated the relationship between rumination/anger rumination and aggression. CONCLUSION: These results clarify the nature of the relationships between these conceptually connected constructs and suggest that the frequency with which someone rehearses aggressive scripts impacts on the likelihood of aggression more than anger rumination and general ruminative processes. The frequency with which a person rehearses aggressive scripts should be a critical consideration in violence risk assessment and treatment programs for people deemed to be at risk for violent behavior.

Aggressive Script Rehearsal in Adult Offenders: Characteristics and Association With Self-Reported Aggression.

This study explored the frequency, recency, content, severity, and targets of aggressive scripts reported by 94 incarcerated Australian males. The scripts of participants who reported a history of repeated and severe aggression were compared with the scripts of participants who reported a history of less severe and less frequent aggression. As hypothesized, participants with a history of more frequent and severe aggressive behavior reported more severe aggressive script content and more frequent script rehearsal. Furthermore, participants with a history of more frequent and severe aggressive behavior reported feelings of anticipation and excitement when they rehearsed aggressive scripts as well as an increase in the severity of aggressive scripts rehearsed over time. These results have important implications for risk assessment and treatment of violent offenders.

Evaluation of early relational disturbance in high-risk populations: Borderline personality disorder features, maternal mental state, and observed interaction.

Despite the longstanding theoretical association in the attachment literature between maternal trauma history and disturbances in the mother-infant interaction, few studies have investigated mechanisms of transmission of traumatogenic relational patterns in high-risk mother-infant dyads. This study investigated interrelationships among maternal trauma history, distorted maternal representations (DMRs, i.e. disturbed thoughts and feelings about the infant and self-as-parent), maternal mentalisation (i.e. capacity to conceive of self and other's intentions in terms of mental states including thoughts, feelings, and desires), and quality of interaction in a clinical sample of mothers with Borderline Personality Disorder (BPD) features and their infants (N = 61). Measures used included the Childhood Trauma Questionnaire, Parent Development Interview, Mother-Infant Relationship Scale, Borderline Symptom Checklist-23, and the Emotional Availability Scales. The results indicated BPD features mediated the relationship between maternal trauma history and DMRs predicting disturbance in interaction. In addition, analyses showed that maternal mentalisation had a buffering effect between DMRs and maternal non-hostility and yet the severity of BPD features moderated the relationship between mentalisation and DMRs. The findings suggest postpartum borderline pathology may adversely impact the experience of being a parent for women with a relational trauma history including deficits in mentalisation (i.e. hypermentalising) and disturbances in the mother-infant interaction. Implications for research and clinical practice are discussed.

A pesar de la larga asociación teorética en la literatura de la afectividad entre el historial de trauma materno y perturbaciones en la interacción madre-infante, pocos estudios han investigado mecanismos de transmisión de patrones de relación traumatogénicos en díadas madre-infante de alto riesgo. Este estudio investigó interrelaciones entre el historial de trauma materno, las distorsionadas representaciones maternas (DMR, v.g. pensamientos y sentimientos perturbados acerca del infante y de sí misma como madre), la mentalización materna (v.g. capacidad para concebir las intenciones propias y de otros en términos de estados mentales), y la calidad de interacción en un grupo muestra clínico de madres con características de Trastornos de Personalidad Limítrofe (BPD) y sus infantes (N = 61). Entre las medidas usadas están el Cuestionario de Trauma de Niñez, la Entrevista de Desarrollo de la Progenitora, la Escala de Relación Madre-Infante, la Lista de Verificación de Síntomas de Personalidad Limítrofe - 23, y las Escalas de Disponibilidad Emocional. Los resultados indicaron que las características BPD mediaron la relación entre el historial de trauma materno y las DMR prediciendo perturbaciones en la interacción. Es más, los análisis mostraron que la mentalización materna tenía un efecto amortiguador entre las DMR y la no hostilidad materna y aun así la severidad de las características BPD moderaron la relación entre la mentalización y las DMR. Los resultados sugieren que la patología limítrofe posterior al parto pudiera impactar adversamente la experiencia de ser madre para mujeres con historial de trauma, incluyendo déficits en la mentalización (v.g. la hipermentalización) y las perturbaciones en la interacción madre-infante. Se discuten las implicaciones para la investigación y la práctica clínica.

En dépit de la longue association théorique dans les recherches sur l'attachement entre le passé de trauma de la mère et les perturbations dans l'interaction mère-bébé, il existe peu d'études portant sur les mécanismes de transmission de patterns relationnels traumagénétiques chez les dyades mère-bébé à haut risque. Cette étude s'est penchée sur les interrelations entre le passé de trauma de la mère, des représentations maternelles déformées (des DMR, c'est-à-dire des pensées déformées ainsi que des sentiments déformés sur le bébé et soi-même en tant que parent), la mentalisation maternelle (c'est-à-dire la capacité de concevoir ses propres intentions ainsi que celles des autres en termes d'états mentaux), et la qualité de l'interaction chez un échantillon clinique de mères ayant les caractéristiques du trouble de la personnalité limite et leurs bébé (N = 61). Les mesures utilisées ont inclus le Questionnaire de Trauma de l'Enfance, l'Entretien du Développement du Parent, l'Echelle de Relation Mère-Bébé, la Checklist de Symptômes de la Personnalité Limite-23, ainsi que les Echelles de Disponibilité Emotionnelle. Les résultats ont indiqué que les traits de TPL affectaient la relation entre l'histoire de trauma de la mère et les DMS = R prédisant une perturbation dans l'interaction. De plus les analyses ont montré que la mentalisation maternelle faisait effet de tampon entre les DMR et la non-hostilité maternelle et pourtant la sévérité des traits TPL modérait la relation entre la mentalisation et les DMR. Les résultats suggèrent qu'une pathologie limite postpartum pourrait avoir un impact adverse sur l'expérience de parentage pour les femmes ayant un passé de trauma, y compris des déficits dans la mentalisation (par exemple, une hyper-mentalisation) et des perturbations dans l'interaction mère-bébé. Les implications pour les recherches et la pratique clinique sont discutées.

Development and initial reliability and validity of a new measure of distorted maternal representations: The Mother-Infant Relationship Scale.

Distorted maternal representations (DMRs)-mother's ideas, understanding, and feelings about the infant-shape early interaction and the emerging relationship. Distorted interactions reportedly affect infant attachment and socioemotional development and may be associated with maternal early adversity and trauma. Limited measures are available that could be used as screening tools of DMRs. The aims of this study were to (a) describe the development of the Mother-Infant Relationship Scale (MIRS) and (b) to evaluate its psychometric properties. The development and validation of the MIRS closely followed standard guidelines for the development of psychometric tests. Psychometric properties were examined across two samples: 78 adult psychiatric patients with features of borderline personality and 86 individuals from a nonclinical sample (N = 164). The scale demonstrated excellent internal consistency (Cronbach's α = .91) for the clinical sample and adequate internal consistency (.78) for the nonclinical sample, excellent test-retest reliability (intraclass correlation coefficient = .81), and good concurrent validity with an observational (Pearson's correlation coefficients = -.35 to -.54) and a representational measure (.53). Factor analysis revealed three components: DMRs specific to (a) maternal hostility/rejection of the infant, (b) issues about parenting/attachment, and (c) anxiety/helplessness about infant care. Findings suggest that the MIRS is a reliable and valid screening tool of DMRs. Potential uses in clinical and research settings are discussed.

Las Representaciones Maternas Distorsionadas (DMR) - ideas, comprensión y sentimientos de la madre sobre el infante - le dan forma a la temprana interacción y la naciente relación. Las interacciones distorsionadas, según se dice, afectan la unión afectiva y el desarrollo socio-emocional del infante y pudieran estar asociadas con la temprana adversidad y trauma maternos. Limitadas medidas están disponibles para ser usadas como herramientas de detección de DMR. Las metas de este estudio fueron (1) describir el desarrollo de la Escala de la Relación Madre-Infante (MIRS) y (2) evaluar sus propiedades sicométricas. El desarrollo y validación de MIRS siguió muy de cerca los parámetros estándares para el desarrollo de pruebas sicométricas. Las propiedades sicométricas fueron examinadas en 2 grupos muestras: 78 pacientes siquiátricos adultos con características de personalidad limítrofe y 86 individuos de un grupo muestra no clínico (N=164). La escala demostró una consistencia interna excelente (alfa de Cronbach .91) para el grupo muestra clínico y adecuada (.78) para el no clínico, una excelente confiabilidad de prueba y re-prueba (ICC .81), y una buena validez simultánea con una medida de observación (coeficientes de correlación de Pearson entre -.35 y -.54) y una de representación (.53). Los análisis de factores revelaron 3 componentes: específicas DMR para (1) hostilidad materna/rechazo del infante, (2) asuntos sobre crianza/afectividad, (3) ansiedad/sentirse sin ayuda acerca del cuidado del infante. Los resultados sugieren que MIRS es una herramienta de detección de DMR confiable y válida. Se discuten los posibles usos en escenarios clínicos y la investigación.

Les Représentations Maternelles Déformées (RMD en français) - les idées des mères, leur compréhension, leurs sentiments sur le nourrisson - donnent forme à l'interaction et à la relation qui émerge. Il semblerait que les interactions déformées affectent l'attachement du nourrisson et le développement socio-émotionnel et qu'elles pourraient être liées à l'adversité maternelle précoce et au trauma. Des mesures limitées sont disponibles qui pourraient être utilisées comme outils de dépistages des RMD. Dans ce contexte, les buts de cette étude étaient de (1) décrire le développement de l'Echelle de la Relation Mère-Nourrisson (MIRS en anglais) et (2) évaluer ses propriétés psychométriques. Le développement et la validation de la MIRS ont suivi attentivement les lignes directrices standard pour le développement de tests psychométriques. Les propriétés psychométriques ont été examinées au travers de 2 échantillons: 78 patients psychiatriques adultes avec des traits de la personnalité limite, et 86 individus d'un échantillon non-clinique (N=164). L'échelle a fait preuve d'une cohérence interne excellente (alpha de Cronbach ,91) pour l'échantillon clinique et adéquate (,78) pour l'échantillon non-clinique, ainsi que d'une fiabilité test-re-test excellente (ICC s81), tout comme d'une bonne validité simultanée avec une mesure d'observation (coefficients de corrélation de Pearson allant de -,35 à -,54) et une mesure de représentation (,53). L'analyse de facteurs a révélé 3 composantes spécifiques aux RMD (1) de l'hostilité/la rejection du nourrisson, (2) des problèmes de parentage/attachement, (3) de l'anxiété / du désarroi à propos du soin du nourrisson. Les résultats suggèrent que la MIRS est un outil fiable et valide de détection des RMD. Des utilisations possibles dans des milieux cliniques et des milieux de recherche sont discutés.

Talking about trauma in therapy: Perspectives from young people with post-traumatic stress symptoms and first episode psychosis.

AIM: Despite recommendations from national guidelines, individuals with first episode psychosis (FEP) are currently unlikely to have the effects of their traumatic experiences assessed and treated within psychosis treatment. This may be due to the mismatch between the objectives of trauma-specific treatments (directly targeting post-traumatic stress symptoms by talking about the trauma) and trauma-informed care (limiting practices that may retraumatise clients). We aimed to gain an understanding of what it was like for young people to talk about trauma in FEP treatment, and how their experiences related to the broad conceptualisations of trauma-informed and trauma-specific treatment approaches. METHODS: Semi-structured interviews were conducted with eleven participants (18-27 years) with FEP and post-traumatic stress disorder (PTSD) symptoms after the completion of an intervention for the effects of trauma. Transcripts were analysed using an interpretative phenomenological approach. RESULTS: Two superordinate themes were identified, each with subordinate themes. 1. Reluctance to approach the trauma memory: 1a. Not wanting to talk about trauma; 1b. Difficulty acknowledging that the trauma had occurred; 1c. Not wanting to re-experience emotions associated with trauma. 2. Factors aiding the process: 2a. Desire for change; 2b. Not being pushed to talk; 2c. Valuing the case manager; 2d. Time. CONCLUSIONS: A majority of participants in the study experienced reluctance when recounting their trauma memories. Being in control of how trauma memories are shared and having time for the therapeutic relationship to develop enhanced participants' readiness for talking about trauma. Incorporating trauma-informed principles and motivational interviewing could aid in facilitating the processes around talking about trauma.

Investigating the prevalence of dissociative disorders and severe dissociative symptoms in first episode psychosis.

AIM: Increasing evidence suggests that childhood trauma and dissociation are associated with psychotic symptoms and disorders. Significant rates of dissociative disorders and clinical levels of dissociative symptoms are found in chronic schizophrenia. To date, no studies have examined the prevalence of these in a first episode psychosis (FEP) group. This study aimed to investigate the prevalence of dissociative disorders and symptoms in a FEP sample as well as the prevalence of severe dissociative symptoms in those with or without experiences of childhood trauma. METHODS: Sixty-six young people with FEP completed a research interview which included the structured clinical interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) Axis I Disorders, Childhood Trauma Questionnaire and the Structured Clinical Interview for DSM-IV Dissociative Disorders-Revised. RESULTS: Dissociative symptoms at clinical levels were found in 36.4% of the sample. Furthermore, 13.6% of the sample met diagnostic criteria for a lifetime dissociative disorder. Significant differences in the frequency of clinical dissociative symptoms between those with or without childhood trauma were also found. CONCLUSIONS: Dissociative symptoms should be routinely assessed for in early intervention settings, especially in cases where childhood trauma is disclosed or suspected. Where present, dissociative symptoms should also be incorporated into subsequent case formulation and treatment planning.

Does dissociation mediate the relationship between childhood trauma and hallucinations, delusions in first episode psychosis?

BACKGROUND: Childhood trauma has been linked to the presence of delusions and hallucinations in psychosis, although the mechanisms underlying this relationship require elucidation. Dissociation, characterized by disruptions to the integrative functioning of several core mental domains, has emerged as a potential mechanism. There is a paucity of research using a clinician-rated measure of dissociation to test the indirect effect of dissociation on the relationship between childhood trauma and psychotic symptoms. This study aimed to investigate whether dissociation mediated both the relationships between childhood trauma and hallucinations, and childhood trauma and delusions utilizing a clinician-administered measure of dissociation, namely the Structured Clinical Interview for DSM-IV Dissociative Disorders - Revised (SCID-D-R). METHOD: Sixty-six first-episode psychosis (FEP) participants completed a research interview and questionnaires. Information about experiences of childhood trauma, psychosis, dissociation, general psychopathology and demographics were collected. RESULTS: When using the SCID-D-R, childhood trauma positively correlated with dissociation. Further, dissociation mediated the relationship between childhood trauma and delusions. Contrary to previous findings, we found no relationship between dissociation and hallucinations and no mediating effect of dissociation on the association between childhood trauma and hallucinations. The results of the SCID-D-R differed significantly from those of the Dissociative Experiences Scale-II (DES-II) which were consistent with previous research. CONCLUSIONS: Our findings are the first to use a clinician-rated measure to test the mediating effect of dissociation on the relationship between childhood trauma and positive symptoms (i.e., hallucinations and delusions). Given the discrepancies in results between the SCID-D-R and DES-II, how dissociation is measured in future research is an important consideration. The results add to a body of work that increasingly recognizes the importance of dissociative symptoms on the relationship between childhood trauma and psychosis. The results suggest that dissociative symptoms should be part of routine assessment in those with a history of trauma and present to FEP services.

Cultural expressions of depression and the development of the Indonesian Depression Checklist.

Depression may manifest differently across cultural settings, suggesting the value of an assessment tool that is sensitive enough to capture these variations. The study reported in this article aimed to develop a depression screening tool for Indonesians derived from ethnographic interviews with 20 people who had been diagnosed as having depression by clinical psychologists at primary health centers. The tool, which we have termed the Indonesian Depression Checklist (IDC), consists of 40 items. The tool was administered to 125 people assessed to have depression by 40 clinical psychologists in primary health centers. The data were analyzed with Confirmatory Factor Analysis (CFA) (IBM SPSS AMOS Software). CFA identified a five-factor hierarchical model ( χ 2 = 168.157, p = .091; CFI = .963; TLI = .957; RMSEA = .036). A 19-item inventory of the IDC, with five factors - Physical Symptoms, Affect, Cognition, Social Engagement and Religiosity - was identified. There was a strong correlation between the total score of the IDC and total score of the Center for Epidemiological Studies-Depression scale (revised version CES-D), a standard tool for assessing symptoms of depression. The IDC accommodates culturally distinctive aspects of depression among Indonesians that are not included in the CES-D.

Impairments in Spatiotemporal Gait Adaptation During Obstacle Navigation in Huntington's Disease.

BACKGROUND: Navigating obstacles whilst walking might be associated with poorer balance and a higher risk of falling in individuals with symptomatic Huntington's disease (symp-HD). However, this issue has not been investigated within the literature. OBJECTIVE: A unique obstacle navigation experiment was designed to examine adaptive gait patterns in order to identify spatiotemporal gait characteristics that might be associated with poorer balance and a higher risk of falling in symp-HD. METHOD: Sixteen diagnosed symp-HD participants and 16 age- and sex-matched healthy controls were included. Gait was examined in 3 experimental conditions: baseline walking, walking while navigating around 1 obstacle, and walking while navigating around 2 obstacles. Navigation around obstacle walks was divided into three step phases (approach, navigation, recovery). Group differences in gait variables were analyzed at baseline and during walking for each obstacle condition respectively. Gait variables were also correlated with the Berg Balance Scale (BBS) and Timed Up and Go (TUG) test. RESULTS: Symp-HD participants, compared with controls, performed significantly poorer on most gait variables during baseline walking. Symp-HD participants significantly decreased their step-length while navigating around 1 obstacle, and increased their step-time while navigating around 1 and 2 obstacles. There were no significant group differences in step-width. Variables associated with navigating around obstacles correlated significantly with BBS and TUG clinical tools, which have been associated in the literature with an increased risk of falling in symp-HD. CONCLUSION: These findings could aid clinicians in better managing risk of falls in people with Huntington's disease through targeted and effective strategies.

Distress, Psychotic Symptom Exacerbation, and Relief in Reaction to Talking about Trauma in the Context of Beneficial Trauma Therapy: Perspectives from Young People with Post-Traumatic Stress Disorder and First Episode Psychosis.

BACKGROUND: Of young people with first episode psychosis (FEP), over half report exposure to childhood trauma and consequent co-morbid post-traumatic stress disorder (PTSD) or symptoms. Currently no evidence-based interventions exist for PTSD in FEP. Clinicians report concerns that trauma-focused interventions with young people with FEP could result in distress and symptom exacerbation. Scant research suggests that talking about trauma in therapy can be distressing for some people. AIMS: To explore young people's reactions to a trauma-focused treatment for PTSD in FEP. METHOD: Semi-structured interviews were conducted with eight participants (age 18-27 years) with co-morbid PTSD and FEP, after completing a trauma-focused intervention. Transcripts were analysed using an interpretative phenomenological approach. Participants' baseline and end-of-treatment PTSD and psychotic symptoms were assessed. RESULTS: Three themes related to participants' reactions were identified from the analysis: (1) distress in session; (2) feeling relieved in and out of session; and (3) symptom exacerbation out of session. All but one participant reported experiencing increased distress in session. Four participants described PTSD, psychotic symptoms and/or suicidal ideation worsening in immediate reaction to talking about trauma in therapy sessions. 86% of participants showed improvement in their PTSD and psychotic symptoms at end of treatment. All participants described the intervention as beneficial and worthwhile. CONCLUSIONS: Results suggest that feelings of distress are to be expected from individuals with PTSD and FEP during trauma-focused treatment. Psychotic and PTSD symptom exacerbation can occur in PTSD treatment in FEP. Clinicians should be aware of, plan for, and clearly inform their clients of treatment risks.

A randomized controlled trial of cognitive behavioral therapy for insomnia: an effective treatment for comorbid insomnia and depression.

UNLABELLED: Insomnia and depression are highly comorbid conditions that show a complex, bidirectional relationship. This study examined whether cognitive-behavioral therapy for insomnia (CBT-I) delivered by a therapist compared with self-help CBT-I (written materials only) reduces insomnia and depression severity in individuals with comorbid insomnia and depression. A total of 41 participants (18-64 years; 25 females) with comorbid depression and insomnia, treated with antidepressants for at least 6 weeks, were randomized to receive 4 sessions of either CBT-I or self-help CBT-I over 8 weeks. Insomnia (Insomnia Severity Index [ISI]) and depression (Beck Depression Inventory-II [BDI-II]) were assessed at baseline, following each session, and at 3-month follow-up. Secondary outcomes were sleep quality and duration (actigraphy and diaries), anxiety, fatigue, and daytime sleepiness. Compared with self-help CBT-I, BDI-II scores in the CBT-I group dropped by 11.93 (95% confidence interval [CI] [6.60, 17.27], p < .001) more points, and ISI scores dropped by 6.59 (95% CI [3.04, 10.15], p = .001) more points across treatment. At 3-month follow-up, 61.1% of CBT-I participants were in clinical remission from their insomnia and depression, compared with 5.6% of the self-help group. CONCLUSIONS: CBT-I administered by a therapist produced significant reductions in both insomnia and depression severity posttreatment and at follow-up, compared with a control condition in which participants received only written CBT-I material. Targeting insomnia through CBT-I is efficacious for treating comorbid insomnia and depression, and should be considered an important adjunct therapy for patients with depression whose symptoms have not remitted through antidepressant treatment.

The cognitive abilities associated with verbal fluency task performance differ across fluency variants and age groups in healthy young and old adults.

UNLABELLED: Despite their widespread use in research and clinical practice, the cognitive abilities purportedly assessed by different verbal fluency task variants remain unclear and may vary across different healthy and clinical populations. The overarching aim of this study was to identify which cognitive abilities contribute to phonemic, semantic, excluded letter, and alternating verbal fluency tasks and whether these contributions differ across younger and older healthy adults. METHOD: Ninety-six younger (18-36 years) and 83 older (65-87 years) healthy participants completed measures of estimated verbal intelligence, semantic retrieval, processing speed, working memory, and inhibitory control, in addition to phonemic, semantic, excluded letter, and alternating fluency tasks. Eight hierarchical multiple regressions were conducted across the four fluency variants and two age groups to identify which cognitive variables uniquely contributed to these fluency tasks. RESULTS: In the younger group, verbal intelligence and processing speed contributed to phonemic fluency, semantic retrieval to semantic fluency, processing speed and working memory to excluded letter fluency, and semantic retrieval to alternating fluency. In contrast, in the older group, verbal intelligence contributed to phonemic fluency, no cognitive variables contributed to semantic fluency, inhibition to excluded letter fluency, and verbal intelligence to alternating fluency. CONCLUSIONS: Our findings highlight that both lower and higher order cognitive skills contribute to verbal fluency tasks; however, these contributions vary considerably across fluency variants and age groups. The heterogeneity of cognitive determinants of verbal fluency, across variants and age, may explain why older people performed less proficiently on semantic and excluded letter fluency tasks while no age effects were found for phonemic and alternating fluency. Interpretation of verbal fluency performances need to be tailored according to which verbal fluency variant and age group are used.

An examination of the relationship between personality and aggression using the general aggression and five factor models.

This study examined the relationships between personality and aggression using the general aggression (GAM, Anderson and Bushman [2002] Annual Review of Psychology, 53, 27-51) and five factor models (FFMs) (Costa and McCrae [1992] Revised NEO Personality Inventory (NEO-PI-R) and NEO Five-Factor Inventory (NEO-FFI) professional manual. Odessa, FL: Psychological Assessment Resources). Specifically, it examined Ferguson and Dyck's (Ferguson and Dyck [2012] Aggression and Violent Behavior, 17, 220-228) criticisms that the GAM has questionable validity in clinical populations and disproportionately focuses on aggression-related knowledge structures to the detriment of other inputs, specifically personality variables. Fifty-five male offenders attending a community forensic mental health service for pre-sentence psychiatric and/or psychological evaluation were assessed for aggressive script rehearsal, aggression-supportive normative beliefs, FFM personality traits, trait anger and past aggressive behavior. With regard to relationships between five factor variables and aggression, results suggested that only agreeableness and conscientiousness were related to aggression. However, these relationships were: (1) weak in comparison with those between script rehearsal, normative beliefs and trait anger with aggression and (2) were not significant predictors in hierarchical regression analysis when all of the significant univariate predictors, including GAM-specified variables were regressed onto life history of aggression; normative beliefs supporting aggression, aggressive script rehearsal, and trait anger were significantly related to aggression in this regression analysis. These results provide further support for the application of the GAM to aggressive populations.

Effects of prolonged load carriage on ground reaction forces, lower limb kinematics and spatio-temporal parameters in female recreational hikers.

The effect of load carriage on female recreational hikers has received little attention. This study collected lower limb sagittal plane kinematic, spatio-temporal and ground reaction force (GRF) data from 15 female hikers carrying four loads (0%, 20%, 30% and 40% body weight (BW)) over 8 km. Increasing load resulted in a proportional increase in GRF up to 30% BW, increased stance time, and greater mediolateral impulse with 30% and 40% BW. Also seen were decreased velocity and cadence and increased double support and knee flexion when carrying load compared to no load. Increased distance resulted in increased knee flexion and ankle plantar flexion at initial foot-ground contact. It was concluded that, as load mass and distance increased, female hikers modified their gait to attenuate the lower limb impact forces. When carrying 30% and 40% BW loads, however, the changes aimed at attenuating the higher GRF may result in a less stable gait. PRACTITIONER SUMMARY: Limited research has investigated the biomechanical responses of female recreational hikers to prolonged load carriage. This study provides a better understanding of the effects of increasing load on lower limb kinematics, spatio-temporal parameters and the GRF generated by female hikers during prolonged load carriage. The results have implications for the development of load carriage guidelines to minimise the risk of injury to females who carry backpacks and to improve performance for this population.

Does load position affect gait and subjective responses of females during load carriage?

Recreational hikers carry heavy loads while often walking long distances over uneven terrain. Previous studies have suggested that not only the load mass but also the position of the load may influence load carriage. The purpose of this study was to determine the effect of vertical load position on gait and subjective responses of female recreational hikers. Fifteen experienced female hikers walked for 2 km over a simulated hiking trail carrying 30% BW in three vertical load positions (high, medium and low). Lower limb and trunk kinematic, electromyography (EMG) and ground reaction force (GRF) data were collected together with heart rate (HR), ratings of perceived exertion (RPE) and discomfort measures. Although HR, RPE and discomfort measures were not able to discern statistical differences between load positions, the high load position was the most preferred by participants. The high load position also resulted in a more upright posture (p < 0.001), decreased gastrocnemius integrated EMG compared to the medium (p = 0.005) and low load positions (p = 0.02) and a higher first peak deceleration vertical GRF compared to the low load position (p = 0.011). However, the absolute differences were small and unlikely to be functionally relevant in load carriage studies. Based on the findings of this study, a high, medium or low load position cannot be preferentially recommended for healthy, experienced, female hikers carrying 30% BW.

Backpack load affects lower limb muscle activity patterns of female hikers during prolonged load carriage.

This study investigated the effect of prolonged load carriage on lower limb muscle activity displayed by female recreational hikers. Electromyography (EMG) signals from vastus lateralis (VL), biceps femoris (BF), semitendinosus (ST), tibialis anterior (TA) and gastrocnemius (GM) were recorded for fifteen female hikers carrying four loads (0%, 20%, 30% and 40% body weight (BW)) over 8 km. Muscle burst duration, muscle burst onset relative to initial contact and integrated EMG signals (iEMG) were calculated to evaluate muscle activity, whereas the shift in mean power frequency (MPF) was used to evaluate muscle fatigue. Increased walking distance significantly decreased the MPF of TA; decreased the iEMG for VL, ST and GM; and shortened VL muscle burst duration. Furthermore, carrying 20-40% BW loads significantly increased VL and GM iEMG and increased BF muscle burst duration, whereas a 40% BW load caused a later VL muscle burst onset. The differences observed in muscle activity with increased load mass seem to be adjustments aimed at maintaining balance and attenuating the increased loads placed on the lower limbs during gait. Based on the changes in muscle activity, a backpack load limit of 30% BW may reduce the risk of lower limb injury for female hikers during prolonged walking.

Effect of load mass on posture, heart rate and subjective responses of recreational female hikers to prolonged load carriage.

Load carriage has been associated with a risk of upper and lower limb musculoskeletal disorders with women suffering significantly higher injury rates than their male counterparts. Despite this injury risk, there are limited evidence-based guidelines for recreational hikers, particularly female recreational hikers, regarding safe backpack loads. The purpose of the present study was to determine how variations in load mass affected the heart rate, posture and subjective responses of women during prolonged walking to provide evidence for a load mass limit for female recreational hikers. Heart rate (HR), posture and ratings of perceived exertion (RPE) and discomfort were collected for 15 female experienced recreational hikers (22.3 ± 3.9 years) while they hiked for 8 km at a self-selected pace under four different load conditions (0%, 20%, 30% and 40% of body weight (BW)). Although HR was not significantly affected by load mass or walking distance, increasing load mass and distance significantly affected posture, RPE and discomfort of the upper body. Carrying a 20% BW load induced significant changes in trunk posture, RPE and reported shoulder discomfort compared to the unloaded condition. The 20% BW load also resulted in a mean RPE rating of 'fairly light', which increased to 'hard' when carrying a 40% BW load. As load carriage distance increased participants reported significantly increased shoulder, neck and upper back discomfort. Based on the changes to posture, self-reported exertion and discomfort when carrying loads of 20%, 30% and 40% BW over 8 km, it was concluded that a backpack load limit of 30% BW should be recommended for female recreational hikers during prolonged walking.