Graduate Thesis Or Dissertation
 

The relationship between rate of torque development of the triple extensors at different time intervals

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  • The ability to quickly generate torque of the triple extensors is critical during rapid movements, especially when there is not enough time to reach peak torque. Rate of torque development (RTD), which is the rate of rise of the torque-time curve, is a commonly used measure of rapid torque generation. However, the relationship between RTD of the triple extensors at different time intervals has yet to be investigated. The purpose of this study was to assess the relationship between RTD of the triple extensors at different time intervals (0-25, 0-50, 0-100, 0-150, 0-200 and 0250 ms). Thirty healthy, recreationally active volunteers (15 females, 15 males) participated in the study. In order to assess RTD of the triple extensors, isometric hip extension, knee extension, and plantarflexion torque-time curves of the dominant limb were recorded using a Biodex System 3 dynamometer. During the first 50 ms, the correlations were very similar among all three muscle groups. However, after that time period, the relationships between the muscle groups diverged. While relationships of RTD of the KE and plantarflexors (PF) remained consistent across all the time intervals, relationships of RTD of the hip extensors (HE) and knee extensors (KE) was highest at the 0-50 ms time interval and then lowered at the later time intervals. In addition, relationships of RTD of the HE and PF increased up to the 0100 ms time interval and then was lower after that time interval. This suggests that the KE and PF exhibited the similar pattern of rapid torque production while the HE exhibited the different pattern of rapid torque production compared to the other two primary triple extensors.
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