Hayden Gregory Croft

Otago Polytechnic · Institute of Sport Exercise and Health

Using an expert consensus-based approach, a netball video analysis consensus (NVAC) group of researchers and practitioners was formed to develop a video analysis framework of descriptors and definitions of physical, technical and contextual aspects for netball research. The framework aims to improve the consistency of language used within netball i...

A previous research has identified large data and information sources which exist about netball performance and align with the discussion of coaches during the games. Normative data provides context to measures across many disciplines, such as fitness testing, physical conditioning, and body composition. These data are normally presented in the tab...

BLUF Rugby union players experience sudden spikes with internal and external training loads as they transition from an amateur into a semi-professional environment, with large changes in acute: chronic workload ratio and key GPS metrics. ABSTRACT Measuring and monitoring training load are necessary tools required for planning training sessions. Thi...

In sport, an "explosion" of information has meant that coaches may not have the time or cognitive resources to integrate it effectively into their decision-making. Research suggests that a disconnect exists between the information provided from the "sport scientist to coach", and subsequently between "coach to player". Further investigation is requ...

In sport, an "explosion" of information has meant that coaches may not have the time or cognitive resources to integrate it effectively into their decision-making. Research suggests that a disconnect exists between the information provided from the "sport scientist to coach", and subsequently between "coach to player". Further investigation is requ...

The focus of this conference report is the inaugural Oceania Performance Analysis Symposium, held in Auckland in December 2017. Performance Analysis (PA) is a field of sport science which focuses on providing an objective way of recording performance so that key elements of performance can be quantified in a valid and consistent manner. While PA is...

The advent of sports technology has led to large, high-dimensional, performance data sets, which pose decision-making challenges for coaches and performance analysts. If large data sets are managed poorly inaccurate and biased decision-making may actually be enabled. This paper outlines a process for capturing, organising, and analysing a large per...

Despite the popularity of performance analysis with high performance rugby environments, limited attention has been paid to understanding how coaches and practitioners use this information to impact on performance. The aim of this case study was to gain an in-depth understanding of how a professional rugby team – playing in New Zealand’s ITM cup co...

The purpose of this study was to use self-organising maps (SOMs) to visualise the multivariate relationship between physical metrics (PM’s) as measured by GPS and how they relate to a performance outcome in elite-level 7s rugby. The players heart rate was elevated in the high intensity zone for an average of 73% per game and covered an average dist...

Rugby coaches and analysts often use notational data describing match events to assess their team's performance and to devise strategic plans for upcoming matches. However, given the volume and complexity of the data available, it is difficult for them to recognize high-dimensional relationships among the available performance variables. A nonlinea...

With the advent of professionalism in rugby union greater volumes of information are collected about player and team performance. A typical Opta TM , Sports Code TM timeline, for a single rugby match, can have more than 2000 instances and labels of information. Unless there is a prior understanding of an opponent much time can be spent identifying...

Previous studies have explored the use of head cameras in different scenarios, including sport training [1], [2], [3] and [4]. Until recently, athletes had their practice recorded and such recording was used for feedback purposes. This approach is problematic as it does not allow for immediate feedback and does not provide a similar perspective to...

Cadence measurements are commonly used in sport to give athletes and coaches live and delayed information about the frequency of a repetitive movement. Lisa Carrington won gold at the 2012 London Olympics with a cadence of 70 double strokes per minute in the women's K1 200 Canoe Sprint, while Mahe Drysdale won gold in the Men's Single Sculls rowing...

The use of player-mounted cameras (PMCs) in sport is not new; however, most existing PMC devices do not have the ability to transmit footage as it is captured. This appears to be due to the size and cost of transmitters, batteries and aerials. Instead, the footage is normally stored locally (within the device) on a hard drive or a removable secure...

The lineout throw in the sport of Rugby Union is a crucial component in determining whether a team wins possession of the ball. The accuracy and timing of the throw are both important factors in determining whether the opposition can intercept the ball, and these components are determined by the thrower's technique and ability to identify the targe...

Abstract The paper discusses an application of close range photogrammetry for the development of a virtual training system for rugby football, and the use of the technique for the evaluation of rugby players’ performance. NuView, a stereo-imaging device, and a digital high-definition video (HDV) camera were used to capture stereoscopic video footag...

This paper discusses two practical applications of close-range photogrammetry completed at the University of Otago recently. The applications involve: 1) human spine study; and 2) rugby player's limb coordination. The discussion covers: 1) imaging system design; 2) system calibration; 3) image processing and 3D data capture; and 4) usage of the cap...

The paper describes a study using video captured by 3D producer. An off-the-shelf NuView 3D adapter and a Cannon camcorder were used to capture 3D-video footage. The NuView allows two distinct views (left and right view) to enter the single lens camcorder. A simple single convergence control in the NuView allows the user to obtain 3D view of near a...

The paper discusses the evaluation of a video image-splitting device for human motion research. NuView, a commonly available device and a digital video camera (DV) were used to capture stereo-video footage of athletes in training. The device permits two distinct views (left and right perspective views) to enter a single lens DV. A single convergenc...