Illeagal arm action and ball release paper

Bowling action testingOne of our biggest challenges in building a cricket bowling sensor is determining the points for the start of the bowling action and the ball release. Wayne recently published a paper where we have managed to validate ball release determined by the accepted method (high speed video) and our inertial sensors. Its very exciting not just because of the utility of the sensors but also because its an automated method – which is a great time saver. Here is the paper details and a link to the full paper…well done Wayne and team!
http://www.tandfonline.com/doi/abs/10.1080/02640414.2014.962577#.VHJq2aO4bnM

Peak outward acceleration and ball release in cricket

Journal of Sport Sciences
DOI:
10.1080/02640414.2014.962577

Wayne Spratforda*, Marc Portusb, Andrew Wixtedc, Raymond Leadbetterc & Daniel A. Jamesc

Abstract

The purpose of this study was to investigate the utility of peak outward acceleration (POA) measured from an inertial sensor worn at the wrist as an indicator of the critical end point of the bowling action – ball release, a critical element when assessing illegal actions. Twenty-one finger-spin and fast bowlers from nine countries were recruited from the ICC under-19 Cricket World Cup to take part in this research. Bowlers delivered a cross section of their standard deliveries while wearing an inertial sensor placed on their wrists. Ball release was determined by a validated motional analysis ball release (MABR) protocol and compared to the simultaneously collected POA. POA was shown to be highly correlated with MABR (R2 = 0.98) and a Bland–Altman plot indicated that all 148 trials were within the 3.42 frame (0.014 s) limits of agreement. POA when measured by an inertial sensor worn on the wrist during bowling had a close relationship with an established method of identifying ball release in a biomechanical laboratory regardless of bowler and delivery type. Further, accuracy can be achieved with the adoption of a simple regression equation applied to the POA and as such is a valid measure of ball release in cricket bowlers.

 

To cite this article: Wayne Spratford, Marc Portus, Andrew Wixted, Raymond Leadbetter & Daniel A. James (2014): Peak outward acceleration and ball release in cricket, Journal of Sports Sciences, DOI: 10.1080/02640414.2014.962577

To link to this article: http://dx.doi.org/10.1080/02640414.2014.962577

Postcard from Nebraska

Anastasia-sandersonIn a bid to beat the summer heat, Nebraskan student Anastasia came Down Under to Brisvegas to undertake a research internship with David Thiel at SABEL Labs. She wrote a lovely blog back home and clearly was up to a bit more than just doing research judging by the photos…. good on ya mate!

“I’ve always wanted to go abroad,” Sanderson said. “As an engineer, I didn’t want to be stuck in the classroom all the time. Other majors, they get to travel a lot and I was like, ‘Why can’t I do that?’ I was debating the differences between study abroad and internship abroad and I decided on an internship because I knew I wanted to go into industry and an internship would have more weight overall.”

Get the full story here

Our Griffith IMPACT lecture online

Public_Lecture_–_Wearable_Technology__The_edge_of_the_BOOM__–_Part_2___IMPACT___Griffith_SciencesMissed our wearable technologies IMPACT lecture?. Attached is the IMPACT magazine produced by Griffith University with a few stories on our work…hope you like. (wearable tech IMPACT edition)

Also the lectures by David, our deputy director and Judd Armstrong CEO of Jaybird were recorded and are online too.

Here are the two videos:

 

 

SABEL Labs as seen on BBC Click!

swimming-Our SABEL Labs website has been running a bit hot today (OK 35 degrees today in Brisbane too, but that s not what we mean), one might have thought Obama mentioned us in todays G20 speech or something ;)

Turns out our story on our lab by  BBC Click began airing today (See Kirstins account of the filming day ).

If you are lucky enough to live in the UK here is the link to watch online (Thanks Justin S for the link) http://www.bbc.co.uk/iplayer/episode/b04sm3sj/click-australia-special

 

We have also been fielding plenty of enquiries for a commercial product we did some work on…The Jaybird REIGN – see the  full details on jaybirdgear.com

SABEL’s film shoot by Kristin Corley

jono-bbc-clickBecoming increasingly well known for their local and international research, and development within the elite sports and consumer sporting market, SABEL Labs have recently captured the attention of BBC technology program, Click.

With a reach of over 80 million viewers, a feature on Click is a significant exposure win for SABEL.

Filming at the Queensland Academy of Sport and Griffith University, the visit from BBC highlighted SABEL’s most recent collaboration with global giant, Jaybird.

Ranking #8, just behind Go-Pro, for fastest growing consumer brands over $20 million in revenue, the commercial collaboration with Jaybird is an exciting leap for the research group.

SABEL’s team of researchers have played a pivotal role in developing the leading knowledge behind Raybird Reign – a new wearable technology, ready for launch to the international market on November 1st.

jump-test It’s this intricate knowledge, research and expertise in sports technology that captured the attention of BBC Click.

Speaking to the program from the Queensland Academy of Sport, Jono Neville, a member of the SABEL Research team, elaborated on the value of commercial research collaborations. “Research in a University environment can often stay as research to assist future studies. In this instance, our partnership with Jaybird brings together our knowledge, algorithms and research outcomes and packages it in a market-ready application”.

With Jaybird promising to understand the needs of every day consumers, SABEL’s technical contribution to the product means end-users can now link meaningful experience, knowledge and ownership around their daily activities.

swimming-

As Nick Kwek, Producer for BBC Click noted, SABEL’s research means consumers will now “have a smart coach in their pocket”.

With a follow-up visit with the BBC scheduled in 2015, the SABEL team is motivated to leverage the exposure and further promote their knowledge and research outcomes in sports technology.

Jono Neville summed up the achievement perfectly. “It’s a great feeling to see our work out there, knowing everyday people will benefit from the research we’ve done.”

To learn more about SABEL’s collaboration with Jaybird, join us on Wednesday 5 November for a Public Lecture co-hosted between Dr David Rowlands (SABEL) and Mr Judd Armstrong (CEO, Jaybird).

http://app.griffith.edu.au/sciencesimpact/wearable_tech_lecture/

Visitors from afar. University, Sport and a little Budo

photo 2We were delighted to spend some time this week with Prof. Wada from Japan at SABEL Labs.
Prof. Wada is from Kagoshima on the island of Kyushu in Japan. He is from the National Institute of fitness and Sports in Kanoya, one of only two in Japan. The university supports a range of sports as well as traditional Japanese Budo (martial arts) – for which Kagoshima is somewhat famous.
We had some very interesting discussions about the handling of time series biomechanics and performance data and we look forward to his return in the near future, perhaps for an extended stay.
photo 3 photo 4 photo 5