MORPHOLOGY AND HYDRODYNAMIC RESISTANCE IN YOUNG SWIMMERS

  • Andrew Lyttle
  • Nat Benjanuvatra
  • Brian A. Blanksby
  • Bruce C. Elliott
Keywords: hydrodynamic drag, morphology, streamlined gliding, swimming

Abstract

Morphology and hydrodynamic drag were measured of 6 males and 6 females, from each of the 9, 11 and 13 yr age groups. Net forces were examined when towing swimmers while prone streamlined gliding and flutter kicking at 1.3 to 2.5 ms-1. The passive drag force at 1.9, 2.2 and 2.5 ms-1 increased with age and anthropometry, but no changes were found at 1.3 and 1.6 ms-1. Stepwise regression revealed passive drag best predicted net active drag at velocities of 1.3, 1.9, 2.2 and 2.5 ms-1. Results supported the Froude number theory that increased height will reduce wave-making drag.