title: The effects of heavy-sled sprint training on acceleration capabilities in female rugby sevens athletes: A pilot study

authors: Sella, Francesco Stefano

abstract: INTRODUCTION: Well-developed acceleration abilities are critical for performance in rugby sevens. In this pilot study, we investigated the effects of heavy-sled sprint training on acceleration in female rugby sevens athletes. METHODS: Eleven junior female rugby sevens athletes completed 3-weeks of resisted sprint training (5-30 m) with heavy sleds (30 to 85% of body mass). Acceleration performance and biomechanical outputs were computed pre- and post-intervention using the methods described by Samozino et al. (2016). Training-induced changes were calculated using effect size (ES) and magnitude-based inferences. Correlations (r) between changes in sprint performance and biomechanical outputs (pre-post changes, and at baseline) were calculated. RESULTS: Small improvements in 5 m and 10 m times, and changes in mechanical effectiveness of force application (RFmax), maximum power output (Pmax), and force-velocity slope (SFV) were observed (ES = 0.36-0.40). Very large to almost perfect correlations were found between changes in 5 m and 10 m times with changes in Pmax, theoretical maximal (horizontal) force (F0), RFmax, rate of decrease in mechanical effectiveness (DRF), and SFV (r = 0.85-0.96). Changes in 5 m and 10m times were also very largely to almost perfectly correlated with initial individual profiles (SFV, DRF, F0, and Pmax) (r = 0.73-0.91). DISCUSSION: Heavy-sled sprint training was likely to improve 5 m and 10 m times, maximum power, and sprint biomechanics. Changes in Pmax, F0, DRF, RFmax, and SFV explained over 72% of the variance associated with improvements in 5 m and 10 m times. Furthermore, retrospective analysis showed that the initial individual force-velocity profiles were associated with the magnitude of improvements in sprint characteristics. TAKE HOME MESSAGE: Heavy-sled sprint training is likely to increase acceleration capabilities over short distances in female rugby sevens athletes. Changes in defined biomechanical outputs, and individual force-velocity profiles appear to be associated with these improvements.

text: The effects of heavy-sled sprint training on acceleration capabilities in female rugby sevens athletes: A pilot study INTRODUCTION: Well-developed acceleration abilities are critical for performance in rugby sevens. In this pilot study, we investigated the effects of heavy-sled sprint training on acceleration in female rugby sevens athletes. METHODS: Eleven junior female rugby sevens athletes completed 3-weeks of resisted sprint training (5-30 m) with heavy sleds (30 to 85% of body mass). Acceleration performance and biomechanical outputs were computed pre- and post-intervention using the methods described by Samozino et al. (2016). Training-induced changes were calculated using effect size (ES) and magnitude-based inferences. Correlations (r) between changes in sprint performance and biomechanical outputs (pre-post changes, and at baseline) were calculated. RESULTS: Small improvements in 5 m and 10 m times, and changes in mechanical effectiveness of force application (RFmax), maximum power output (Pmax), and force-velocity slope (SFV) were observed (ES = 0.36-0.40). Very large to almost perfect correlations were found between changes in 5 m and 10 m times with changes in Pmax, theoretical maximal (horizontal) force (F0), RFmax, rate of decrease in mechanical effectiveness (DRF), and SFV (r = 0.85-0.96). Changes in 5 m and 10m times were also very largely to almost perfectly correlated with initial individual profiles (SFV, DRF, F0, and Pmax) (r = 0.73-0.91). DISCUSSION: Heavy-sled sprint training was likely to improve 5 m and 10 m times, maximum power, and sprint biomechanics. Changes in Pmax, F0, DRF, RFmax, and SFV explained over 72% of the variance associated with improvements in 5 m and 10 m times. Furthermore, retrospective analysis showed that the initial individual force-velocity profiles were associated with the magnitude of improvements in sprint characteristics. TAKE HOME MESSAGE: Heavy-sled sprint training is likely to increase acceleration capabilities over short distances in female rugby sevens athletes. Changes in defined biomechanical outputs, and individual force-velocity profiles appear to be associated with these improvements.

year: 2018

title: The Acoustic Ecology of the First-Person Shooter

authors: Grimshaw, Mark Nicholas

subjects: acoustic ecology

abstract: This thesis contributes to the field of Game Studies by presenting the hypothesis that the player(s) and soundscape(s) in the first-person shooter (FPS) game, and the relationships between them, may be construed as an acoustic ecology.  It explores the idea that the single-player FPS game acoustic ecology has the basic components of player and soundscape and that the relationships between these two lead to the creation and perception of a variety of spaces within the game world constituting a significant contributing factor to player immersion in that world.  Additionally, in a multiplayer FPS game, these individual acoustic ecologies form part of a larger acoustic ecology which may be explained through autopoietic principles.

There has been little written on digital game sound (much less on FPS game sound) and so the research contained within this thesis is an important contribution to the Game Studies field.  Furthermore, the elaboration of the hypothesis provides insight into the role of sound in the perception of a variety of spaces in the FPS game, and player immersion in those spaces, and this has significance not only for Game Studies but also for other disciplines such as virtual environment design and the study of real-world acoustic ecologies.

A text-based methodology is employed in which literature from a range of disciplines is researched for concepts relevant to the hypothesis but, where necessary, new concepts will be devised.  The aim of the methodology is to construct a conceptual framework which is used to explicate the hypothesis and which may, with future refinement, be used for the study of sound in digital game genres other than FPS.

text: The Acoustic Ecology of the First-Person Shooter This thesis contributes to the field of Game Studies by presenting the hypothesis that the player(s) and soundscape(s) in the first-person shooter (FPS) game, and the relationships between them, may be construed as an acoustic ecology.  It explores the idea that the single-player FPS game acoustic ecology has the basic components of player and soundscape and that the relationships between these two lead to the creation and perception of a variety of spaces within the game world constituting a significant contributing factor to player immersion in that world.  Additionally, in a multiplayer FPS game, these individual acoustic ecologies form part of a larger acoustic ecology which may be explained through autopoietic principles.

There has been little written on digital game sound (much less on FPS game sound) and so the research contained within this thesis is an important contribution to the Game Studies field.  Furthermore, the elaboration of the hypothesis provides insight into the role of sound in the perception of a variety of spaces in the FPS game, and player immersion in those spaces, and this has significance not only for Game Studies but also for other disciplines such as virtual environment design and the study of real-world acoustic ecologies.

A text-based methodology is employed in which literature from a range of disciplines is researched for concepts relevant to the hypothesis but, where necessary, new concepts will be devised.  The aim of the methodology is to construct a conceptual framework which is used to explicate the hypothesis and which may, with future refinement, be used for the study of sound in digital game genres other than FPS.

year: 2007

title: Making the invisible visible: Exploring the complex pathways between childhood experiences of maltreatment and the perpetration of family harm

authors: Dempster-Rivett, Kirsty

subjects: Childhood maltreatment

abstract: Preventing family harm and providing care for those affected is a high priority for governments and social services worldwide. Adverse consequences of family harm continue to place demands on justice, mental health and care and protection services. The costs to individuals, families and communities are beyond measure, given that rates of family harm are under-reported. Quantitative researchers have demonstrated a link between childhood maltreatment and family harm perpetration with existing psychological theories used to explain this link. However, mainstream theories were first developed many decades ago, at a time when the notion of gender was not inclusively factored into theory development. Neither were they developed with or by Indigenous peoples, calling into question the translatability of mainstream theories for stopping the intergenerational transmission of trauma and violence. 
The main aim of this thesis was to explore the relationship between childhood maltreatment and the perpetration of family harm by investigating two research questions. How could psychological theories better explain the pathways between childhood experiences of maltreatment and family harm perpetration? And, to what extent do psychological theories about the cycle of family harm reflect the experiences of Māori and non-Māori men and women in Aotearoa New Zealand? To answer these questions, interviews were conducted with 16 individuals who self-identified as perpetrating family harm and had childhood histories of maltreatment. (n=8 men, n=8 women). Purposive sampling ensured an equal number of Māori (Indigenous people of Aotearoa New Zealand) and non-Māori participated in the research. Thematic analysis was utilised to examine the personal conceptualisations regarding the association between experiences of childhood maltreatment and subsequent perpetration of family harm. The core corpus of data explored the maltreatment-family harm relationship within and between Māori and non-Māori men and women. This thesis is comprised of three studies that investigate the intergenerational transmission of trauma and violence.

The first study analysed the interviews of the seven participants removed from their families of origin as children. All described ongoing experiences of poly-victimisation in subsequent placements, whether through adoption, foster or residential settings. When examined alongside all women interviewed in this thesis, men more often reported that their childhood maltreatment was overlooked by professionals. The findings of this study highlighted a relationship between the perpetration of family harm and limited relational and emotional experiences during childhood. Intervention points across the life span were identified to stop the intergenerational transmission of trauma and violence for people removed from their family of origin as children.

The second study focused on the experiences of the eight Māori men and women interviewed. A culture of silence surrounding childhood maltreatment pervaded all interviewees’ childhood experiences. However, additional issues, including cultural isolation, were evident for Māori from the adults and professionals charged with their care. Māori interviewees identified three core Indigenous concepts that facilitated healing and intergenerational wellbeing: Wairua (spiritual connection), Pou (becoming a symbol of strength and support for self and others), and Tūrangawaewae (finding a sense of belonging). A return to Indigenous knowledge and practices was integral to stopping the intergenerational transmission of trauma and violence. This highlights the importance of privileging Indigenous knowledge in existing theoretical understanding of the cycle of family harm and incorporation in prevention initiatives.

The final study explored the impact of psychological distress within the cycle of family harm. Everyone interviewed experienced severe adverse trauma reactions linked to mental health and addiction issues, self-harm and suicidality, and instances of family harm. A significant barrier to psychological and familial wellbeing was the lack of access to integrated models of care capable of responding to complex and intertwined issues in trauma informed and Indigenous informed ways. Thus, family harm, trauma and mental health and addiction services need to work together to tailor and deliver treatment according to the individual and family needs to break the cycle of family harm and ongoing adverse life course trajectories. 

This research identifies significant limitations in the psychological theories that usually contribute to thinking about family harm. There has been a particular failure to develop a theory that accounts for the heterogeneous cultural and gendered experiences of the cycle of family harm. Going forward, expanding the? view of traditional psychological theories of intergenerational trauma and violence is required to account for the historical trauma of colonisation and the ongoing adverse consequences for Indigenous communities. Family harm prevention initiatives must be led by and/or developed in partnership with and by Indigenous peoples to ensure responsivity through active incorporation of traditional practices for intergenerational healing and wellbeing.

The impact of poly-victimisation in childhood had severe and ongoing adverse consequences for both men and women that outweighed any obvious gender difference. For people who have experienced childhood maltreatment, it is essential to imbue initiatives with opportunities to understand emotions in relational contexts. Children who are placed in the care of the state must be cared for and, unlike the interviewees in this thesis, free from further childhood maltreatment. A therapeutic web should be established to stop the systemic issues identified in this thesis by providing cohesive and coherent services in a timely fashion for children and adults affected by the cycle of family harm. In conclusion, adopting practices that are informed by understandings of trauma, gender, and Indigenous knowledge are needed to replace the intergenerational transmission of trauma and violence with hope and wellbeing.

text: Making the invisible visible: Exploring the complex pathways between childhood experiences of maltreatment and the perpetration of family harm Preventing family harm and providing care for those affected is a high priority for governments and social services worldwide. Adverse consequences of family harm continue to place demands on justice, mental health and care and protection services. The costs to individuals, families and communities are beyond measure, given that rates of family harm are under-reported. Quantitative researchers have demonstrated a link between childhood maltreatment and family harm perpetration with existing psychological theories used to explain this link. However, mainstream theories were first developed many decades ago, at a time when the notion of gender was not inclusively factored into theory development. Neither were they developed with or by Indigenous peoples, calling into question the translatability of mainstream theories for stopping the intergenerational transmission of trauma and violence. 
The main aim of this thesis was to explore the relationship between childhood maltreatment and the perpetration of family harm by investigating two research questions. How could psychological theories better explain the pathways between childhood experiences of maltreatment and family harm perpetration? And, to what extent do psychological theories about the cycle of family harm reflect the experiences of Māori and non-Māori men and women in Aotearoa New Zealand? To answer these questions, interviews were conducted with 16 individuals who self-identified as perpetrating family harm and had childhood histories of maltreatment. (n=8 men, n=8 women). Purposive sampling ensured an equal number of Māori (Indigenous people of Aotearoa New Zealand) and non-Māori participated in the research. Thematic analysis was utilised to examine the personal conceptualisations regarding the association between experiences of childhood maltreatment and subsequent perpetration of family harm. The core corpus of data explored the maltreatment-family harm relationship within and between Māori and non-Māori men and women. This thesis is comprised of three studies that investigate the intergenerational transmission of trauma and violence.

The first study analysed the interviews of the seven participants removed from their families of origin as children. All described ongoing experiences of poly-victimisation in subsequent placements, whether through adoption, foster or residential settings. When examined alongside all women interviewed in this thesis, men more often reported that their childhood maltreatment was overlooked by professionals. The findings of this study highlighted a relationship between the perpetration of family harm and limited relational and emotional experiences during childhood. Intervention points across the life span were identified to stop the intergenerational transmission of trauma and violence for people removed from their family of origin as children.

The second study focused on the experiences of the eight Māori men and women interviewed. A culture of silence surrounding childhood maltreatment pervaded all interviewees’ childhood experiences. However, additional issues, including cultural isolation, were evident for Māori from the adults and professionals charged with their care. Māori interviewees identified three core Indigenous concepts that facilitated healing and intergenerational wellbeing: Wairua (spiritual connection), Pou (becoming a symbol of strength and support for self and others), and Tūrangawaewae (finding a sense of belonging). A return to Indigenous knowledge and practices was integral to stopping the intergenerational transmission of trauma and violence. This highlights the importance of privileging Indigenous knowledge in existing theoretical understanding of the cycle of family harm and incorporation in prevention initiatives.

The final study explored the impact of psychological distress within the cycle of family harm. Everyone interviewed experienced severe adverse trauma reactions linked to mental health and addiction issues, self-harm and suicidality, and instances of family harm. A significant barrier to psychological and familial wellbeing was the lack of access to integrated models of care capable of responding to complex and intertwined issues in trauma informed and Indigenous informed ways. Thus, family harm, trauma and mental health and addiction services need to work together to tailor and deliver treatment according to the individual and family needs to break the cycle of family harm and ongoing adverse life course trajectories. 

This research identifies significant limitations in the psychological theories that usually contribute to thinking about family harm. There has been a particular failure to develop a theory that accounts for the heterogeneous cultural and gendered experiences of the cycle of family harm. Going forward, expanding the? view of traditional psychological theories of intergenerational trauma and violence is required to account for the historical trauma of colonisation and the ongoing adverse consequences for Indigenous communities. Family harm prevention initiatives must be led by and/or developed in partnership with and by Indigenous peoples to ensure responsivity through active incorporation of traditional practices for intergenerational healing and wellbeing.

The impact of poly-victimisation in childhood had severe and ongoing adverse consequences for both men and women that outweighed any obvious gender difference. For people who have experienced childhood maltreatment, it is essential to imbue initiatives with opportunities to understand emotions in relational contexts. Children who are placed in the care of the state must be cared for and, unlike the interviewees in this thesis, free from further childhood maltreatment. A therapeutic web should be established to stop the systemic issues identified in this thesis by providing cohesive and coherent services in a timely fashion for children and adults affected by the cycle of family harm. In conclusion, adopting practices that are informed by understandings of trauma, gender, and Indigenous knowledge are needed to replace the intergenerational transmission of trauma and violence with hope and wellbeing.

year: 2022