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ICSS 2007 Athlete Response to Using a Real-Time Optical Navigation Feedback System Richard Kirby richard@advancedracingcomputers.com 1 Introduction richard@advancedracingcomputers.com

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icss 2007

ICSS 2007

Athlete Response to Using a Real-Time Optical Navigation Feedback System

Richard Kirby

richard@advancedracingcomputers.com

1

introduction
Introduction

richard@advancedracingcomputers.com

Today, athletes in many sports benefit from real-time quantitative feedback about their performance during training and racing

Feedback is critical as it is the brain’s link to the body. (Shea et al., 1993)

Quantitative feedback in alpine skiing generally comes well after the performance

Technique improvement often comes through video analysis that is qualitative and comes hours after the training

2

aim of this study
Aim of this study

richard@advancedracingcomputers.com

Verify if alpine ski racers perceive a benefit from using real time audio feedback related to lateral displacement to improve their carving technique

Evaluate the “distraction” effect of audio feedback while training

Evaluate if the skiers detect a change in the characteristics of their skis due to the apparatus

3

apparatus
Apparatus

Click to view Video

richard@advancedracingcomputers.com

4

technology
Technology

Y

X

richard@advancedracingcomputers.com

5

feedback
Feedback

richard@advancedracingcomputers.com

One beep per 0.5 mm slip at most sensitive level

Actual delay between slip and feedback 0.125 seconds

6

slide7

richard@advancedracingcomputers.com

Randomly selected young racers training at Mount Hood as part of summer race camps

Familiarized the racers with the meaning of the feedback

Racers trained 2 hours with device in gates

Racers filled out survey

Racers were interviewed for subjective comments

7

subjects
Subjects

richard@advancedracingcomputers.com

12 club level racers (5 years to 15 years racing)

13 – 18 years old except one 43 year old master

Average age 18.9 years old

5 girls, 7 boys

11 out of 12 had never used real time feedback prior to test

8

familiarization
Familiarization

richard@advancedracingcomputers.com

Skiers must understand what the feedback is telling them

Sensitivity/threshold must be set to the skill level of the skier and snow conditions

9

garland
Garland

Click to view video

richard@advancedracingcomputers.com

10

drifted initiation
Drifted initiation

Click to view video

richard@advancedracingcomputers.com

11

single carved arc
Single carved arc

Click to view video

richard@advancedracingcomputers.com

12

linked carved turns
Linked carved turns

Click to view video

richard@advancedracingcomputers.com

13

did having the device attached to your skis affect your skiing
Did having the device attached to your skis affect your skiing?

richard@advancedracingcomputers.com

15

did the real time feedback help you better understand your carving skills
Did the real time feedback help you better understand your carving skills?

richard@advancedracingcomputers.com

16

did the real time feedback help you improve your carving skills
Did the real time feedback help you improve your carving skills?

richard@advancedracingcomputers.com

17

how often would you like to use real time feedback in training
How often would you like to use real time feedback in training?

N = 9

richard@advancedracingcomputers.com

18

how satisfied were you using real time feedback for training
How satisfied were you using real time feedback for training?

richard@advancedracingcomputers.com

19

comments from interview
It is like watching a video of yourself while you are skiing

I’ve been racing for 10 years and I didn’t know I slipped that badly at the initiation of my turn

It really helped me understand the issues I have with the timing of my turns

The audio feedback was distracting at first

It tells me I’m doing something wrong, but not what to do to correct it

Comments from Interview

richard@advancedracingcomputers.com

20

discussion
Discussion

richard@advancedracingcomputers.com

  • While we did not evaluate if performance actually improved, we interviewed several of the coaches who believed that they saw improvements in their skiers after the two hour test
  • Some skiers adapted to the feedback much quicker than others
    • Those that were more technologically savvy
    • Those that play computer games
  • Importance of familiarization process

21

slide22

Next steps

richard@advancedracingcomputers.com

Evaluate performance improvement

Evaluate different types of feedback and different familiarization exercises

Evaluate the effect of a coaching program based around using real-time feedback (coaches device)

22

conditions
Conditions

richard@advancedracingcomputers.com

Hard snow

Slope gradual enough to carve cleanly all gates

Mixture of GS and SL gates, stubies and brushes

24

survey results25
Survey Results

richard@advancedracingcomputers.com

  • Did real time feedback help you better understand your carving skills.
    • 83% definitely
    • 17% probably
  • Did real time feedback help you improve your carving skills
    • 50% definitely
    • 33% probably
    • 17% not sure

25

survey results continued
Survey Results (continued)

richard@advancedracingcomputers.com

  • How often would you like to use real time feedback in training?
    • 11% > 70% of the time
    • 78% 30% to 70% of the time
    • 11% < 30%
    • 3 no-answer
  • Satisfaction with real time feedback as training tool in gates
    • 58% Very satisfied
    • 33% Somewhat satisfied
    • 8 % Neither satisfied nor dissatisfied

26