Transcript Supplementary Assistance for Rowing Coaching “Examining the effect of real-time visual feedback on the quality of rowing technique” Simon Fothergill Ph.D.

Supplementary Assistance for
Rowing Coaching
“Examining the effect of real-time visual feedback on the quality of rowing technique”
Simon Fothergill
Ph.D. student, Computer Laboratory, University of Cambridge
8th Conference of the International Sports Engineering Association, Vienna, July 2010
Technology helps rowers maintain good technique
• A system can give real-time, visual feedback of raw
kinetic data for an indoor rower’s technique.
• The system is deployed in a real training environment
and used by coaches and rowers.
• The system is a suitable training tool for helping to
maintain consistently good technique.
Feedback must be evaluated
• Feedback is a fundamental pedagogical mechanism
• Self-perception
• Busy coaches
• Complexity and “data-bloat”
• Evaluation is scarce
Kinetics Captured Cheaply
Novel sensors allow coaches to characterise data
Deployment driven design of feedback
Does performance depend on training task, physiological
condition or feedback?
Evaluation Methodology
1. Coach athlete until made progress
2.
Record target performance
3.
Row with different feedback:
i.
none
ii.
real-time kinetics
iii. target performance
4.
under various conditions:
i.
After 30 minutes, comfortable rate
ii.
After 5 weeks, comfortable rate
iii. After 5 weeks, race pace
iv. After 5 weeks, fatigued, comfortable
rate
Participants
• 5 amateur rowers
• 2 professional GB rowing coaches
How technically good is a performance?
Performance metrics
1. Energy supplied to ergometer
2. Approximate consistency
2. Approximate similarity to target
3. Approximate efficiency
Results
Example: The force performance metrics increases
with feedback and decreases without during a session
from Expt. 1 for rower 3.
The mean and standard deviation for the metrics over all the strokes of a session are given.
Values are rounded to 3 significant figures. Some data was lost due to a sensor system fault.
Feedback is useful whilst fatigued
• Little / detrimental effect on performance immediately after rowing (1 case where
feedback helps).
• Quite strong correlation after prolonged solo training and during race-pace
piece.
• Significant correlation during fatigued rowing.
Logistics limits evaluation
• Better algorithms to measure the similarity between performances have been discovered
based on Discrete Time Warping.
• Evaluation dataset is currently small.
• Order of experiments is not varied.
• Sessions are only 1 minute long.
• Separate investigation of the forms of feedback used within the system.
• Evaluation of further forms of feedback such as haptic displays.
• Correlation of performance metrics.
Technology helps rowers maintain good technique
The system is of some use in helping rowers to maintain a consistently
good technique as described by a coach, especially when the athletes
suffer from extended absence of their own coach or become fatigued.
Acknowledgements
Professor Andy Hopper
Computer Laboratory, Cambridge
SeSAME (EPSRC project)
Jesus College Cambridge Boat Club
Cambridge Cantabs. Boat Club
GB Rowing
Thank you for your attention.
Comments and questions, please!