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European Journal of Applied Physiology

, Volume 96, Issue 4, pp 459–470 | Cite as

Economy and efficiency of swimming at the surface with fins of different size and stiffness

  • Paola ZamparoEmail author
  • David R. Pendergast
  • Albert Termin
  • Alberto E. Minetti
Original Article

Abstract

The aim of this study was to investigate how fins with varying physical characteristics affect the energy cost and the efficiency of aquatic locomotion. Experiments were performed on ten college swimmers who were asked to swim the dolphin kick while using a monofin (MF) and to swim the front crawl kick with a small-flexible fin (SF), a large-stiff fin (LS) and without fins (BF, barefoot). The energy expended to cover one unit distance (C) was highest for BF (C=10.6±1.8 kJ m−1 kg−1 at 0.8 m s−1) and decreased by about 50% with LS, 55% with SF and 60% with MF, allowing for an increase in speed (for a given metabolic power) of about 0.4 m s−1 for MF and of about 0.2 m s−1 for SF and LS (compared with BF). At any given speed, the fins for which C was lower were those with the lowest kick frequency (KF): KF=1.6±0.22 Hz at 0.8 m s−1 (for BF) and decreased by about 40% for SF, 50% for LS and 60% for MF. The decrease in KF from BF to SF–LS and MF was essentially due to the increasing surface area of the fin which, in turn, was associated with a higher Froude efficiency (ηF). ηF was calculated by computing the speed of the bending waves moving along the body in a caudal direction (as proposed for the undulating movements of slender fish): it increased from 0.62±0.01 in BF to 0.66±0.03 in SF and 0.67±0.04 in LS reaching the highest values (0.76±0.05) with MF. No single fin characteristic can predict a swimmer’s performance, rather the better fin (i.e. MF) is the one that is able to reduce most KF at any given speed and hence to produce the greatest distance per kick (d=v/KF). The latter indeed increased from 0.50±0.01 m in BF to about 0.90±0.05 m in SF and LS and reached values of 1.22±0.01 m in MF.

Keywords

Fin swimming Propelling efficiency Kick frequency Energy balance 

Notes

Acknowledgements

We acknowledge the technical assistance of Chris Eisenhardt, Dean Marky and Frank Modlich during the experiments and the patience and kind cooperation of the swimmers. Also, we would like to thank Dr. Scott White and Laura Malczewski for helping in the video data analysis and Dr. Miriam Isola for helping with the statistical analysis. This research has been partially supported by the US navy, NAVSEA, Navy Experimental Diving Unit, Contract N16 33199C0028.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Paola Zamparo
    • 1
    Email author
  • David R. Pendergast
    • 2
  • Albert Termin
    • 3
  • Alberto E. Minetti
    • 4
  1. 1.Dipartimento di Scienze e Tecnologie BiomedicheUniversità degli Studi di UdineUdineItaly
  2. 2.Department of PhysiologyUniversity of BuffaloBuffaloUSA
  3. 3.Department of AthleticsUniversity of BuffaloBuffaloUSA
  4. 4.Institute for Biophysical and Clinical Research into Human MovementManchester Metropolitan University - CheshireAlsagerUK

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