TY  - JOUR
AU  - Koutedakis, Y.
A2  - Koutedakis, Y.
A2  - Frischknecht, R.
A2  - Murthy, M.
DB  - BISp
DP  - BISp
KW  - Ballett
KW  - Beweglichkeit
KW  - Dysbalance, muskuläre
KW  - Extension
KW  - Flexion
KW  - Frau
KW  - Kniegelenk
KW  - Lendenwirbelsäule
KW  - M. quadriceps femoris
KW  - Mann
KW  - Muskulatur, ischiocrurale
KW  - Orthopädie
KW  - Prognose
KW  - Rudersport
KW  - Rückenschmerz
KW  - Sportmedizin
KW  - Sporttraumatologie
KW  - Ätiologie
LA  - eng
TI  - Knee flexion to extension peak torque ratios and low-back injuries in highly active individuals
TT  - Verhaeltnisse der maximalen Kraftmomente von Beugung zu Streckung im Kniegelenk und Verletzungen der Lendenwirbelsaeule bei sportlich aktiven Personen
PY  - 1997
N2  - The purpose of this study was to investigate for possible relationships between knee flexion to extension peak torque ratios (Fl/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/s. 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 Fl/Ext-rat, obtained at 1.04 rad/s, 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 Fl/Ext-rat obtained at the angular velocity of 4.19 rad/s 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 Fl/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.   Verf.-Referat
L2  - https://dx.doi.org/10.1055/s-2007-972636
DO  - 10.1055/s-2007-972636
SP  - S. 290-295
SN  - 0172-4622
JO  - International journal of sports medicine
IS  - 4
VL  - 18
M3  - Gedruckte Ressource
M3  - Elektronische Ressource (online)
ID  - PU199710207807
ER  -