Abstract 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.
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.
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.
Many people with probable depression present at primary health care centers (PHC) with physical complaints. Clinical psychologists (CPs) in Sleman district and Yogyakarta city, Special Province of ...Yogyakarta, Indonesia, have been integrated into PHC to provide psychological services. The study on which we draw aimed to explore how depression is managed in PHC. Thirty four CPs and twenty people diagnosed with mild to moderate depression participated in semi-structured interviews. Based on the thematic analysis of their transcribed interviews, seven themes emerged: community education and support, referral pathways, assessing depression, diagnosis, communicating a diagnosis, accepting diagnosis, and treatment of depression. The co-location of CPs with other medical services at the PHC level supports community understandings of mental health problems. It also encourages community members to use PHC services and to have access to various behavioral interventions for people with depression. Recommendations and directions for further research are discussed.
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.
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.
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.
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.
To explore young people's reactions to a trauma-focused treatment for PTSD in FEP.
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.
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.
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.
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).
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.
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.
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.
•Dissociation correlated with childhood trauma (CT) in an early psychosis group.•Dissociation mediates the relationship between CT and delusions using the SCID-D-R.•How studies measure dissociation in those with psychosis is important to consider.•For people with early psychosis and CT, dissociation should be routinely assessed.
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.
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