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The significance of crank load dynam...

Fregly, Benjamin Jon.

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The significance of crank load dynamics to steady-state pedaling biomechanics: An experimental and computer modeling study.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The significance of crank load dynamics to steady-state pedaling biomechanics: An experimental and computer modeling study./
Author:	Fregly, Benjamin Jon.
Description:	181 p.
Notes:	Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2616.
Contained By:	Dissertation Abstracts International54-05B.
Subject:	Engineering, Biomedical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9326469

The significance of crank load dynamics to steady-state pedaling biomechanics: An experimental and computer modeling study.
Fregly, Benjamin Jon.

The significance of crank load dynamics to steady-state pedaling biomechanics: An experimental and computer modeling study. - 181 p.

Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2616.

Thesis (Ph.D.)--Stanford University, 1993.

Pedaling with different crank inertial loads has not been thoroughly investigated. Consequently, how to model the dynamics of the crank load remains unclear. Such a dynamical model would allow for computer simulation of crank motion, new biomechanical analyses, and optimization studies of pedaling coordination.Subjects--Topical Terms:

1017684
Engineering, Biomedical.

The significance of crank load dynamics to steady-state pedaling biomechanics: An experimental and computer modeling study.
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005 20060710080720.5
008 130610s1993 eng d
035 $a (UnM)AAI9326469
035 $a AAI9326469
040 $a UnM $c UnM
100 1 $a Fregly, Benjamin Jon. $3 1904964
245 1 4 $a The significance of crank load dynamics to steady-state pedaling biomechanics: An experimental and computer modeling study.
300 $a 181 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2616.
500 $a Adviser: Felix E. Zajac.
502 $a Thesis (Ph.D.)--Stanford University, 1993.
520 $a Pedaling with different crank inertial loads has not been thoroughly investigated. Consequently, how to model the dynamics of the crank load remains unclear. Such a dynamical model would allow for computer simulation of crank motion, new biomechanical analyses, and optimization studies of pedaling coordination.
520 $a This dissertation investigates how crank load dynamics affect steady-state pedaling biomechanics. The investigation proceeded in three stages. First, the characteristics of the crank load were determined. Crank load dynamical models were developed to emulate a standard ergometer (low inertial load) and a road bicycle (high inertial load). A laboratory ergometer was modified to emulate the crank load dynamics of a specific road-riding situation. The models were then evaluated by their ability to simulate experimental trajectories. Though a one degree-of-freedom model could emulate the crank load dynamics of a standard ergometer, a two degree-of-freedom model was needed to emulate the crank load dynamics of a road bicycle.
520 $a Next, experiments were performed to compare the biomechanics of low and high inertia pedaling. Inertial load was found to have only a small influence on some biomechanical quantities (i.e., driving pedal force, crank torque, and net muscle joint torques) but a profound influence on other quantities (i.e., cadence variability, driving pedal force variability, and crank angle variations). Consequently, though the biomechanics of ergometer pedaling is similar to that of road riding, the neuromuscular control of the two tasks may be somewhat different.
520 $a Finally, a mechanical power analysis of how net muscle joint torques produce pedaling movements was derived from a computer simulation based on a two-legged pedaling model that included the crank load dynamics. This analysis revealed that ankle and hip extensor joint torques function synergistically to deliver power to the crank during the downstroke. Knee extensor and flexor joint torques function independently to deliver power to the crank through the top and bottom of the stroke, respectively, which prevents freewheel decoupling. During the upstroke, ankle extensor joint torque transfers power from the crank to the limb to restore the potential energy of the limb.
590 $a School code: 0212.
650 4 $a Engineering, Biomedical. $3 1017684
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Biophysics, General. $3 1019105
690 $a 0541
690 $a 0548
690 $a 0786
710 2 0 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 54-05B.
790 1 0 $a Zajac, Felix E., $e advisor
790 $a 0212
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9326469