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Knee flexion to extension peak torque ratios and low-back injuries in highly active individuals.
Int J Sports Med. 1997 May; 18(4):290-5.IJ

Abstract

The purpose of this study was to investigate for possible relationships between knee flexion to extension peak torque ratios (F1/Ext(rat)) and low-back injuries in highly active males and females. Forty-eight male (age 25.9 +/- 4.5 years) and 41 female (age 27.3 +/- 2.6 years) competitive rowers, and 20 male (age 26.6 +/- 6.0 years) professional ballet dancers volunteered for the study. Each subject performed a test of lumbar and knee flexor flexibility, isokinetic dynamometry and completed a self-administered questionnaire. Flexibility was assessed by using the sit-and-reach test. Knee flexion to extension peak torques were bilaterally monitored at the angular velocities of 1.04 and 4.19 rad x s(-1). The questionnaire was designed to obtain information regarding the number of days off action (e.g., training, competition, and rehearsals), due to low-back injuries, for the 12-month period prior to testing. Results revealed significant negative correlation coefficients between knee F1/Ext(rat), obtained at 1.04 rad x s(-1), and days off physical activity for oarsmen (r = - 0.69; p < 0.01), oarswomen (r = -0.62; p < 0.01) and male dancers (r = -0.57; p < 0.05). No such correlations were found for either knee F1/ Ext(rat) obtained at the angular velocity of 4.19 rad x s(-1) or between the sit-and-reach test results and low-back injuries. A sub-group of 22 female rowers was re-tested after a 6-8 month period, during which a special hamstring strength training programme was introduced. The main conclusions were: a) the lower the F1/Ext(rat) the greater the degree of low-back injury, b) at least in female rowers, 6-8 months of hamstring strength training can contribute to a reduction of the incidence of low-back injury, and c) isokinetic assessment of quadriceps and hamstrings obtained at lower compared to higher angular velocities is more prognostic of low back injury.

Authors+Show Affiliations

School of Health Sciences, University of Wolverhampton, United Kingdom.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

9231847

Citation

Koutedakis, Y, et al. "Knee Flexion to Extension Peak Torque Ratios and Low-back Injuries in Highly Active Individuals." International Journal of Sports Medicine, vol. 18, no. 4, 1997, pp. 290-5.
Koutedakis Y, Frischknecht R, Murthy M. Knee flexion to extension peak torque ratios and low-back injuries in highly active individuals. Int J Sports Med. 1997;18(4):290-5.
Koutedakis, Y., Frischknecht, R., & Murthy, M. (1997). Knee flexion to extension peak torque ratios and low-back injuries in highly active individuals. International Journal of Sports Medicine, 18(4), 290-5.
Koutedakis Y, Frischknecht R, Murthy M. Knee Flexion to Extension Peak Torque Ratios and Low-back Injuries in Highly Active Individuals. Int J Sports Med. 1997;18(4):290-5. PubMed PMID: 9231847.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Knee flexion to extension peak torque ratios and low-back injuries in highly active individuals. AU - Koutedakis,Y, AU - Frischknecht,R, AU - Murthy,M, PY - 1997/5/1/pubmed PY - 1997/5/1/medline PY - 1997/5/1/entrez SP - 290 EP - 5 JF - International journal of sports medicine JO - Int J Sports Med VL - 18 IS - 4 N2 - The purpose of this study was to investigate for possible relationships between knee flexion to extension peak torque ratios (F1/Ext(rat)) and low-back injuries in highly active males and females. Forty-eight male (age 25.9 +/- 4.5 years) and 41 female (age 27.3 +/- 2.6 years) competitive rowers, and 20 male (age 26.6 +/- 6.0 years) professional ballet dancers volunteered for the study. Each subject performed a test of lumbar and knee flexor flexibility, isokinetic dynamometry and completed a self-administered questionnaire. Flexibility was assessed by using the sit-and-reach test. Knee flexion to extension peak torques were bilaterally monitored at the angular velocities of 1.04 and 4.19 rad x s(-1). The questionnaire was designed to obtain information regarding the number of days off action (e.g., training, competition, and rehearsals), due to low-back injuries, for the 12-month period prior to testing. Results revealed significant negative correlation coefficients between knee F1/Ext(rat), obtained at 1.04 rad x s(-1), and days off physical activity for oarsmen (r = - 0.69; p < 0.01), oarswomen (r = -0.62; p < 0.01) and male dancers (r = -0.57; p < 0.05). No such correlations were found for either knee F1/ Ext(rat) obtained at the angular velocity of 4.19 rad x s(-1) or between the sit-and-reach test results and low-back injuries. A sub-group of 22 female rowers was re-tested after a 6-8 month period, during which a special hamstring strength training programme was introduced. The main conclusions were: a) the lower the F1/Ext(rat) the greater the degree of low-back injury, b) at least in female rowers, 6-8 months of hamstring strength training can contribute to a reduction of the incidence of low-back injury, and c) isokinetic assessment of quadriceps and hamstrings obtained at lower compared to higher angular velocities is more prognostic of low back injury. SN - 0172-4622 UR - https://www.unboundmedicine.com/medline/citation/9231847/Knee_flexion_to_extension_peak_torque_ratios_and_low_back_injuries_in_highly_active_individuals_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2007-972636 DB - PRIME DP - Unbound Medicine ER -