James R Usherwood

Summary

Affiliation: Harvard University
Country: USA

Publications

  1. ncbi request reprint Biomechanics: no force limit on greyhound sprint speed
    James R Usherwood
    Structure and Motion Laboratory, The Royal Veterinary College, North Mymms, Hertfordshire AL9 7TA, UK
    Nature 438:753-4. 2005
  2. ncbi request reprint The aerodynamics of avian take-off from direct pressure measurements in Canada geese (Branta canadensis)
    James R Usherwood
    Concord Field Station, Harvard University, 100 Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 206:4051-6. 2003
  3. ncbi request reprint Dynamic pressure maps for wings and tails of pigeons in slow, flapping flight, and their energetic implications
    James R Usherwood
    Concord Field Station, Harvard University, 100 Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 208:355-69. 2005
  4. ncbi request reprint Wing inertia and whole-body acceleration: an analysis of instantaneous aerodynamic force production in cockatiels (Nymphicus hollandicus) flying across a range of speeds
    Tyson L Hedrick
    Concord Field Station, Museum of Comparative Zoology, Harvard University, 100 Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 207:1689-702. 2004
  5. ncbi request reprint Running over rough terrain: guinea fowl maintain dynamic stability despite a large unexpected change in substrate height
    Monica A Daley
    Concord Field Station, MCZ, Harvard University, Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 209:171-87. 2006
  6. ncbi request reprint The aerodynamics of revolving wings I. Model hawkmoth wings
    James R Usherwood
    Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
    J Exp Biol 205:1547-64. 2002
  7. ncbi request reprint The aerodynamics of revolving wings II. Propeller force coefficients from mayfly to quail
    James R Usherwood
    Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
    J Exp Biol 205:1565-76. 2002
  8. ncbi request reprint Gait transition cost in humans
    James R Usherwood
    Florida State University, Tallahassee, FL 32306, USA
    Eur J Appl Physiol 90:647-50. 2003
  9. ncbi request reprint Understanding brachiation: insight from a collisional perspective
    James R Usherwood
    Food, Nutrition and Exercise Sciences, Sandels Building, Florida State University, Tallahassee, Florida 32306, USA
    J Exp Biol 206:1631-42. 2003
  10. ncbi request reprint Mechanisms of force and power production in unsteady ricochetal brachiation
    James R Usherwood
    Department of Food, Nutrition and Exercise Sciences, Florida State University, Tallahassee, Florida 32306, USA
    Am J Phys Anthropol 120:364-72. 2003

Detail Information

Publications12

  1. ncbi request reprint Biomechanics: no force limit on greyhound sprint speed
    James R Usherwood
    Structure and Motion Laboratory, The Royal Veterinary College, North Mymms, Hertfordshire AL9 7TA, UK
    Nature 438:753-4. 2005
    ..This supports the idea that greyhounds power locomotion by torque about the hips, so--just as in cycling humans--the muscles that provide the power are mechanically divorced from the structures that support weight...
  2. ncbi request reprint The aerodynamics of avian take-off from direct pressure measurements in Canada geese (Branta canadensis)
    James R Usherwood
    Concord Field Station, Harvard University, 100 Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 206:4051-6. 2003
    ....
  3. ncbi request reprint Dynamic pressure maps for wings and tails of pigeons in slow, flapping flight, and their energetic implications
    James R Usherwood
    Concord Field Station, Harvard University, 100 Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 208:355-69. 2005
    ..5% of the force required to support weight was provided by the wings, and that the aerodynamic muscle-mass specific power required to flap the wings was 272.7 W kg(-1)...
  4. ncbi request reprint Wing inertia and whole-body acceleration: an analysis of instantaneous aerodynamic force production in cockatiels (Nymphicus hollandicus) flying across a range of speeds
    Tyson L Hedrick
    Concord Field Station, Museum of Comparative Zoology, Harvard University, 100 Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 207:1689-702. 2004
    ....
  5. ncbi request reprint Running over rough terrain: guinea fowl maintain dynamic stability despite a large unexpected change in substrate height
    Monica A Daley
    Concord Field Station, MCZ, Harvard University, Old Causeway Road, Bedford, MA 01730, USA
    J Exp Biol 209:171-87. 2006
    ....
  6. ncbi request reprint The aerodynamics of revolving wings I. Model hawkmoth wings
    James R Usherwood
    Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
    J Exp Biol 205:1547-64. 2002
    ..Attempts to derive conventional profile drag and lift coefficients from 'steady' propeller coefficients are relatively successful for angles of incidence up to 50 degrees and, hence, for the angles normally applicable to insect flight...
  7. ncbi request reprint The aerodynamics of revolving wings II. Propeller force coefficients from mayfly to quail
    James R Usherwood
    Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
    J Exp Biol 205:1565-76. 2002
    ..The normal force relationship introduced in the accompanying paper is supported for wings over a large range of aspect ratios in both 'early' and 'steady' conditions; local induced velocities appear not to affect the relationship...
  8. ncbi request reprint Gait transition cost in humans
    James R Usherwood
    Florida State University, Tallahassee, FL 32306, USA
    Eur J Appl Physiol 90:647-50. 2003
    ....
  9. ncbi request reprint Understanding brachiation: insight from a collisional perspective
    James R Usherwood
    Food, Nutrition and Exercise Sciences, Sandels Building, Florida State University, Tallahassee, Florida 32306, USA
    J Exp Biol 206:1631-42. 2003
    ..In addition, the elongated arms characteristic of gibbons improves the geometry of a collision for a given overshoot, and so may be viewed as a morphological adaptation reducing the energetic losses caused by overshooting for safety...
  10. ncbi request reprint Mechanisms of force and power production in unsteady ricochetal brachiation
    James R Usherwood
    Department of Food, Nutrition and Exercise Sciences, Florida State University, Tallahassee, Florida 32306, USA
    Am J Phys Anthropol 120:364-72. 2003
    ..Of these possibilities, leg-lifting and arm-flexing were observed as mechanisms of adding mechanical energy. Net energy loss, and substantial torques about the shoulder, were not observed...
  11. pmc Accounting for elite indoor 200 m sprint results
    James R Usherwood
    Structure and Motion Laboratory, The Royal Veterinary College Hawkshead Lane, North Mymms AL9 7TA, UK
    Biol Lett 2:47-50. 2006
    ..Even elite athletes appear constrained by limb forces...
  12. ncbi request reprint Mechanics of dog walking compared with a passive, stiff-limbed, 4-bar linkage model, and their collisional implications
    James R Usherwood
    The Royal Veterinary College, North Mymms, Hatfield, Herts, UK
    J Exp Biol 210:533-40. 2007
    ..Footfall timings and timing of mechanical energy fluctuations are consistent with strategies to reduce collisional forces, analogous to the suggested role of ankle extension as an efficient powering mechanism in human walking...