title: Rugby placekicking mechanics to inform coaching strategies and enhance performance

authors: Hébert-Losier, Kim

abstract: Introduction The ability to score from placekicks is a trait discriminating winning and losing in elite Rugby Union1. Placekicks account for 45% of points in international Rugby Union, with match outcomes reliant on placekicking success2. Clearly, improving placekicking success can alter match outcomes and should be a key focus in rugby skills coaching. Currently, coaching placekicking techniques mainly relies upon practical experience or findings from other sports or non-elite Rugby Union players tested in laboratory environments. These studies provide limited real-world guidance for placekickers and coaches. Our aim was to determine biomechanical variables that discriminate good and bad placekicking attempts in an ecologically valid environment. Methods Three competitive male placekickers performed 10 kicks outdoors, 35-meters from the goalposts. Placekicker and ball 3D biomechanics were collected at 300-Hz using a Qualysis 3D motion capture system. Coach and player perceptions and placekick outcomes were recorded to define the three best and three worst kicks for each placekicker. Differences between the best and worst kicks were examined using standardised effect sizes (ES). Results Seven variables meaningfully and consistently differentiated the best from worst placekicks in all three players (‘core variables’, Figure 1). In the best kicks, resultant and forward speed of centre of mass were slower at ball contact, but maintained better through contact; the kicking leg reached greater knee flexion during swing and was more flexed at the hip and knee at ball contact; and the trunk was less rotated outwards relative to the kicking direction. Twenty-seven variables were consistently associated with better kicking performance in all players, with a large ES in at least one player (‘meaningful variables’, Figure 1). These variables indicated that the best kicks demonstrated less sideways ball spin, speed, and direction; greater change in vertical and sideways foot speed during ball contact; a more “C” than “J” shape footpath; larger shoulder-to-hip separation; and less ankle motion during swing. Figure 1. Biomechanical variables associated with successful placekicking. Discussion This exploratory study identified biomechanical variables that discriminated the best from the worst placekicks in competitive rugby players. The identified differences can guide coaching of placekicking at a group level in absence of individual data. The variables and coaching cues that appear important in promoting successful placekicking outcomes include controlling centre of mass approach and follow-through speed, enhancing knee flexion and axial rotation range, being on-top of the ball at ball contact, swooping across the ball with the foot, and minimizing ball sideways movements. Acknowledgements We thank the participants and members from the University of Waikato Adams Centre for High Performance for their assistance. References 1. Lim et al., Int J Perform Anal Sport. 2009;9(3):354-367. 2. Quarrie and Hopkins, J Sci Med Sport. 2015;18(2):195-198.

text: Rugby placekicking mechanics to inform coaching strategies and enhance performance Introduction The ability to score from placekicks is a trait discriminating winning and losing in elite Rugby Union1. Placekicks account for 45% of points in international Rugby Union, with match outcomes reliant on placekicking success2. Clearly, improving placekicking success can alter match outcomes and should be a key focus in rugby skills coaching. Currently, coaching placekicking techniques mainly relies upon practical experience or findings from other sports or non-elite Rugby Union players tested in laboratory environments. These studies provide limited real-world guidance for placekickers and coaches. Our aim was to determine biomechanical variables that discriminate good and bad placekicking attempts in an ecologically valid environment. Methods Three competitive male placekickers performed 10 kicks outdoors, 35-meters from the goalposts. Placekicker and ball 3D biomechanics were collected at 300-Hz using a Qualysis 3D motion capture system. Coach and player perceptions and placekick outcomes were recorded to define the three best and three worst kicks for each placekicker. Differences between the best and worst kicks were examined using standardised effect sizes (ES). Results Seven variables meaningfully and consistently differentiated the best from worst placekicks in all three players (‘core variables’, Figure 1). In the best kicks, resultant and forward speed of centre of mass were slower at ball contact, but maintained better through contact; the kicking leg reached greater knee flexion during swing and was more flexed at the hip and knee at ball contact; and the trunk was less rotated outwards relative to the kicking direction. Twenty-seven variables were consistently associated with better kicking performance in all players, with a large ES in at least one player (‘meaningful variables’, Figure 1). These variables indicated that the best kicks demonstrated less sideways ball spin, speed, and direction; greater change in vertical and sideways foot speed during ball contact; a more “C” than “J” shape footpath; larger shoulder-to-hip separation; and less ankle motion during swing. Figure 1. Biomechanical variables associated with successful placekicking. Discussion This exploratory study identified biomechanical variables that discriminated the best from the worst placekicks in competitive rugby players. The identified differences can guide coaching of placekicking at a group level in absence of individual data. The variables and coaching cues that appear important in promoting successful placekicking outcomes include controlling centre of mass approach and follow-through speed, enhancing knee flexion and axial rotation range, being on-top of the ball at ball contact, swooping across the ball with the foot, and minimizing ball sideways movements. Acknowledgements We thank the participants and members from the University of Waikato Adams Centre for High Performance for their assistance. References 1. Lim et al., Int J Perform Anal Sport. 2009;9(3):354-367. 2. Quarrie and Hopkins, J Sci Med Sport. 2015;18(2):195-198.

year: 2018

title: The future of surrogacy in New Zealand – Beyond the adoption model

authors: van Zyl, Liezl

abstract: Surrogacy in New Zealand is treated as a form of adoption. ACART (2014) proposes that the Health Minister consider compensating women who act as surrogate mothers. We think this is a step in the right direction, but until the adoption model is abandoned surrogacy will not be a safe practice for New Zealanders. ACART’s consultation document does not address the issue of legal parenthood, but it is one that is intimately linked to the issue of compensation to surrogates because the Adoption Act (Section 25) prohibits payments in consideration of adoption. If, as we will argue below, surrogates deserve to be compensated for their labour, it is imperative that we acknowledge that the adoption framework is inappropriate in surrogacy.

text: The future of surrogacy in New Zealand – Beyond the adoption model Surrogacy in New Zealand is treated as a form of adoption. ACART (2014) proposes that the Health Minister consider compensating women who act as surrogate mothers. We think this is a step in the right direction, but until the adoption model is abandoned surrogacy will not be a safe practice for New Zealanders. ACART’s consultation document does not address the issue of legal parenthood, but it is one that is intimately linked to the issue of compensation to surrogates because the Adoption Act (Section 25) prohibits payments in consideration of adoption. If, as we will argue below, surrogates deserve to be compensated for their labour, it is imperative that we acknowledge that the adoption framework is inappropriate in surrogacy.

year: 2015

title: Pātangaroa: Co-developing management strategies for a starfish outbreak in Ōhiwa Harbour

authors: Ranapia, Megan

subjects: marine management

abstract: The management of marine environments often prioritises scientific information to address complex marine social-ecological issues. However, there is a wealth of learning to be gained from Indigenous people who have generated place-based intergenerational understandings and cultural ethics and practices. Consequently, Indigenous knowledge alongside science can offer better insights, holistic understanding, sustainable management strategies and greater sources of evidence. This research is located in Aotearoa New Zealand and engages in mātauranga Māori (Māori knowledge) alongside marine ecology as an appropriate method for contemporary marine research and management. The thesis study focused on Ōhiwa Harbour, aiming to co-develop a starfish management action plan (SMAP) with local iwi (tribe) Ngāti Awa and other affiliated iwi, district councils and regional council to address the overabundant starfish (species: Coscinasterias muricata and Patiriella regularis). By engaging in transdisciplinary research and collaborative decision-making, this study sought to bridge the gap between Indigenous knowledge and mainstream science, offering lessons for inclusive marine management practices.

To achieve this, I developed and prescribed a co-developed framework actively promoting a mixed-methods approach, inclusive of kaupapa Māori research methodologies, tikanga, participatory design, applied mātauranga ā iwi, quantitative marine scientific field methods and experimental study design. Through the collaborative process, I identified areas of appropriate research aims and methods. This included co-developing a novel starfish trapping methodology sensitive to local ecology and cultural values and an experimental starfish removal study to assist decision-makers in implementing an efficient and effective starfish removal regime as an approach to management.

Results from the field studies showed the efficacy of starfish traps is dependent on environmental conditions, physical characteristics and soaking time (the length of time the trap is left in the water). A soaking time of 48 h maintained the highest starfish catch per unit effort (CPUE) while minimising time to re-bait and reset traps. Observations also indicated an open trap design had less bycatch than a semi-enclosed box trap and could withstand the tidal currents for a longer period. The findings found that bait type did not impact on CPUE. In the starfish removal study, the combined effort of diver removals and trapping produced higher daily catch rates than the single treatments (i.e., diver removals only or trapping only), therefore was themost efficient removal method. The empirical information gathered from the field studies was then used to inform the SMAP and was accepted unanimously at the highest local/regional co-management level. Furthermore, through the findings I identified future research opportunities that would further close gaps in our knowledge around the best management approaches for a starfish outbreak. These included investigation into the predation impacts of P. regularis on mussel recruitment, identification of alternative restoration sites less susceptible to starfish predation pressures and investigation of potential drivers of the starfish outbreak.

Overall, the acceptance of the SMAP by local iwi/hapū and government authorities underscores the success of the collaborative approach. The collaborative process not only addresses the immediate concerns of starfish infestation but contributed to the broader goal of supporting kaitiakitanga (active guardianship) responsibilities and promoting Indigenous perspectives in marine management. This thesis demonstrates and recommends a new approach to starfish management in coastal marine areas using both marine science and mātauranga Māori understandings, practices and ethics, furthermore, it demonstrates the commitment to the inclusion of multiple knowledge systems and involvement of communities.

text: Pātangaroa: Co-developing management strategies for a starfish outbreak in Ōhiwa Harbour The management of marine environments often prioritises scientific information to address complex marine social-ecological issues. However, there is a wealth of learning to be gained from Indigenous people who have generated place-based intergenerational understandings and cultural ethics and practices. Consequently, Indigenous knowledge alongside science can offer better insights, holistic understanding, sustainable management strategies and greater sources of evidence. This research is located in Aotearoa New Zealand and engages in mātauranga Māori (Māori knowledge) alongside marine ecology as an appropriate method for contemporary marine research and management. The thesis study focused on Ōhiwa Harbour, aiming to co-develop a starfish management action plan (SMAP) with local iwi (tribe) Ngāti Awa and other affiliated iwi, district councils and regional council to address the overabundant starfish (species: Coscinasterias muricata and Patiriella regularis). By engaging in transdisciplinary research and collaborative decision-making, this study sought to bridge the gap between Indigenous knowledge and mainstream science, offering lessons for inclusive marine management practices.

To achieve this, I developed and prescribed a co-developed framework actively promoting a mixed-methods approach, inclusive of kaupapa Māori research methodologies, tikanga, participatory design, applied mātauranga ā iwi, quantitative marine scientific field methods and experimental study design. Through the collaborative process, I identified areas of appropriate research aims and methods. This included co-developing a novel starfish trapping methodology sensitive to local ecology and cultural values and an experimental starfish removal study to assist decision-makers in implementing an efficient and effective starfish removal regime as an approach to management.

Results from the field studies showed the efficacy of starfish traps is dependent on environmental conditions, physical characteristics and soaking time (the length of time the trap is left in the water). A soaking time of 48 h maintained the highest starfish catch per unit effort (CPUE) while minimising time to re-bait and reset traps. Observations also indicated an open trap design had less bycatch than a semi-enclosed box trap and could withstand the tidal currents for a longer period. The findings found that bait type did not impact on CPUE. In the starfish removal study, the combined effort of diver removals and trapping produced higher daily catch rates than the single treatments (i.e., diver removals only or trapping only), therefore was themost efficient removal method. The empirical information gathered from the field studies was then used to inform the SMAP and was accepted unanimously at the highest local/regional co-management level. Furthermore, through the findings I identified future research opportunities that would further close gaps in our knowledge around the best management approaches for a starfish outbreak. These included investigation into the predation impacts of P. regularis on mussel recruitment, identification of alternative restoration sites less susceptible to starfish predation pressures and investigation of potential drivers of the starfish outbreak.

Overall, the acceptance of the SMAP by local iwi/hapū and government authorities underscores the success of the collaborative approach. The collaborative process not only addresses the immediate concerns of starfish infestation but contributed to the broader goal of supporting kaitiakitanga (active guardianship) responsibilities and promoting Indigenous perspectives in marine management. This thesis demonstrates and recommends a new approach to starfish management in coastal marine areas using both marine science and mātauranga Māori understandings, practices and ethics, furthermore, it demonstrates the commitment to the inclusion of multiple knowledge systems and involvement of communities.

year: 2025-05