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The effect of an action-specific isokinetic task on the functional H/Q ratio

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Sauret, Jérôme (2007) The effect of an action-specific isokinetic task on the functional H/Q ratio. Masters thesis, University of Gloucestershire.

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Official URL: https://eprints.glos.ac.uk/id/eprint/10612

Abstract

The aetiological factor for the occurrence of ACL injury is a failure of the stability systems during the performance of a decelerating manoeuvre. Deficient neuromuscular efficiency ,due to decreased joint angle, increased velocity and the presence of fatigue, has been suggested as potential ACL injury risk factor. The ratio of eccentric extension to concentric extension peak torques, commonly referred to as the functional ratio (Hamstring I Quadriceps) (FR), is a useful marker of reciprocal muscle symmetry. In the present study, the FR was calculated before and after an isokinetic "action-specific" fatigue protocol (50 eccentric Hamstring repetitions / 50 concentric Quadriceps repetitions). Finally, the Concentric Quadriceps and Eccentric Hamstring changes in torque production relationships were investigated. Those calculations use net torque values and as such fail to take co-activation issues into consideration. A pilot study examined the relative and absolute inter-day reliability of the measurements associated with an isokinetic eccentric Hamstring fatigue task. Healthy male volunteers (15) participated in the study (age 26 yrs ± 6 yrs, stature 183.3 cm± 6.8 cm, body mass 86.1 kg ± 11.6 kg). The participants were habituated and then performed the fatigue task twice, two weeks apart. Intraclass correlation coefficients and the repeatability coefficients associated with 95% LoA, suggested moderate to low reproducibility for the fatigue index but sufficient reliability for peak torque and work performed. The main study used two repeated measures ANOV A to observe effects and interactions between time (2) and joint angle- specific FR (2) and between time (2) and angular velocity-specific FR (3). 20 healthy males volunteers participated in the study (age 26 yrs ± 6 yrs, stature 183.1 cm± 6.8 cm, body mass 84.3 kg± 11.5 kg). The testing occurred during two sessions, two weeks apart, randomly allocated to test each muscle group separately. After a standardised warm-up the participants performed pre-fatigue task esting at three velocities, followed by the isokinetic fatigue task (50 eccentric Hamstring repetitions or 50 Quadriceps extensors repetitions) and post-fatigue testing at the same three velocities. It is accepted that the normal r

Item Type:

Thesis (Masters)

Thesis Advisors:

Thesis Advisor	Email	URL
De Ste Croix, Mark	mdestecroix@glos.ac.uk	https://www.glos.ac.uk/staff/profile/mark-de-ste-croix/
Deighan, Martine	mdeighan@glos.ac.uk	https://www.glos.ac.uk/staff/profile/martine-deighan/
James, David	djames4@glos.ac.uk	https://www.glos.ac.uk/staff/profile/david-james/