The purpose of this study was to determine the magnitude the effect of an instructional Intervention on technique (as measured by the active drag coefficient, Cd) and perfon (swimming velocity, SV). The subjects (12 male and 6 female competitive swimmers) were pretested with Aquanex+Video. A one-week Intervention included three classroom and five poolside instructional sessions with technique feedback and specific visual and kinesthetic cues designed to improve the Cd and SV. The subjects were then posttested. There was an over-all significant improvement in both Cd and SV. The Cd decreased by .31o (p<.05) and the SV increased by .26o (p<.05). The results demonstrate that even a relatively short duration of carefully targeted instruction can make a meaningful improvement in technique and performance and will hope-fully encourage coaches to reconsider training time allocation.
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