Hand Force Analysis to Optimize Swimming Technique Rod Havriluk, Ph.D. Swimming Technology Research.

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Presentation transcript:

Hand Force Analysis to Optimize Swimming Technique Rod Havriluk, Ph.D. Swimming Technology Research

 Hand Force Analysis Method  Examples & Model Development  Learning Strategies Force Variations Model

 Model is Based on Science  Faster Skill Development  Avoid Injury Benefits for Coach

 Hand Force Analysis  Previous Research  Principles of Physics Source for Information

Aquanex Test Preparation

Underwater Camera

Test Procedure

Immediate Feedback

Breaststroke Pull

Hand Force Variations Human Model

Force and Velocity

Butterfly Pull

MONA Butterfly

Backstroke Push

MONA Backstroke

Breaststroke Outward Scull

MONA Breaststroke

Freestyle Push

MONA Freestyle

Modél Optimál Natación Biomechanical Model  Minimum Resistance  Maximum Propulsion  Maximum Stroke Length  Maximum Stroke Rate  Minimum Shoulder Stress MONA

Shoulder Anatomy

Shoulder Stress

More Shoulder Stress

Maximum Shoulder Stress

Minimal Force

Force Increase

Time0 sec.35 sec.82 sec Event Hand Force Generation Begins Hands Submerge Below Shoulders Hand Force Generation Ends Proportion of Stroke Cycle 0%43%100% Wasted 43% of Stroke Cycle Becker & Havriluk, 2010

Effective Arm Entry

Ineffective Arm Entry

Time of Exposure

Effective Arm Entry

 Physiology - Quality vs Quantity  Anatomy - Injury potential  Skill-learning - Reinforce limitations Progress Issues

 Traditional  Deliberate Type of Practice

Streamline

Streamline Cues 1.One hand on top of the other 2.Elbows locked 3.Upper arms squeezing ears 4.Vision directed at bottom of pool directly beneath head 5.Legs straight 6.Toes pointed 7.Feet together

Deliberate Practice Effect Jefferies, et al 2012

Practice Effect

Deliberate Practice  Clear instructions  Appropriate task difficulty  Sufficient number of repetitions  Immediate feedback  Individualized supervision  Variety of learning strategies  Stay in cognitive and associative stages  Replicate superior performance

 Hand Force Analysis Method  Examples & Model Development  Learning Strategies Summary

swimmingtechnology.com Thank you. Questions?