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The influence of the inertial proper...

Li, Li.

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The influence of the inertial properties of the human body: Cycling at different pedaling speeds.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The influence of the inertial properties of the human body: Cycling at different pedaling speeds./
作者:	Li, Li.
面頁冊數:	157 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-05, Section: B, page: 2028.
Contained By:	Dissertation Abstracts International60-05B.
標題:	Biophysics, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9932325
ISBN:	9780599328983

The influence of the inertial properties of the human body: Cycling at different pedaling speeds.
Li, Li.

The influence of the inertial properties of the human body: Cycling at different pedaling speeds. - 157 p.

Source: Dissertation Abstracts International, Volume: 60-05, Section: B, page: 2028.

Thesis (Ph.D.)--University of Massachusetts Amherst, 1999.

Human performance will be altered by changes in movement speed. The inertial properties of human limbs may play an important role in these alterations. The effects of these changes may be observed with the measurement of joint and segmental mechanics, as well as muscular kinematics, kinetics and muscular activity patterns. In this study, the cycling motion was used to investigate these inertial effects, following the development of a new mechanical model that provided the theoretical basis of coordination changes with movement speed. The alteration of cycling performance with different pedaling speed was examined using: (1) Surface EMG as an indication of the changes in muscular coordination as a function of cadence; (2) Inverse dynamics and decomposition of mechanical parameters to identify the influence of gravitational, inertial, and external factors; and (3) Simulations via a musculoskeletal modeling approach to assess the contributions of individual muscles. As predicted by the theoretical model, an increase in pedaling speed produced greater changes at the hip joint compared to knee and ankle joint in both muscular activities and mechanical measures. The changes in muscular activity were evident in both the activity of the single joint hip extensor and the coordination among the synergistic muscles. The altered muscular activities with increased cadence were accompanied by changes in joint moments, in the order of hip, knee and ankle joint from greatest to smallest. Further, the responses in movement organization were not linearly related to the increased inertial influence as the pedaling speed increased. Finally, the simulation analysis demonstrated a compensatory relation between gastrocnemius and soleus muscular activities with different pedaling speeds, although the combined patterns of the two were consistent.

ISBN: 9780599328983Subjects--Topical Terms:

1019105
Biophysics, General.

The influence of the inertial properties of the human body: Cycling at different pedaling speeds.
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520 $a Human performance will be altered by changes in movement speed. The inertial properties of human limbs may play an important role in these alterations. The effects of these changes may be observed with the measurement of joint and segmental mechanics, as well as muscular kinematics, kinetics and muscular activity patterns. In this study, the cycling motion was used to investigate these inertial effects, following the development of a new mechanical model that provided the theoretical basis of coordination changes with movement speed. The alteration of cycling performance with different pedaling speed was examined using: (1) Surface EMG as an indication of the changes in muscular coordination as a function of cadence; (2) Inverse dynamics and decomposition of mechanical parameters to identify the influence of gravitational, inertial, and external factors; and (3) Simulations via a musculoskeletal modeling approach to assess the contributions of individual muscles. As predicted by the theoretical model, an increase in pedaling speed produced greater changes at the hip joint compared to knee and ankle joint in both muscular activities and mechanical measures. The changes in muscular activity were evident in both the activity of the single joint hip extensor and the coordination among the synergistic muscles. The altered muscular activities with increased cadence were accompanied by changes in joint moments, in the order of hip, knee and ankle joint from greatest to smallest. Further, the responses in movement organization were not linearly related to the increased inertial influence as the pedaling speed increased. Finally, the simulation analysis demonstrated a compensatory relation between gastrocnemius and soleus muscular activities with different pedaling speeds, although the combined patterns of the two were consistent.
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