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  • 1.
    Alricsson, Marie
    et al.
    Mittuniversitetet.
    Werner, Suzanne
    Karolinska Institutet.
    Young elite cross-country skiers and low back pain: A 5-year study2006In: Physical Therapy in Sport, ISSN 1466-853X, E-ISSN 1873-1600, Vol. 7, no 4, p. 181-184Article in journal (Refereed)
    Abstract [en]

    Objectives To evaluate possible changes in spinal curvature over a period of 5 years of an elite cross-country skiing squad, and to study whether there are any differences in this respect between individuals who report low back pain and those how do not. Participants Fifteen young cross-country skiers (M age=13.6±0.9) participated voluntarily throughout the entire study period. Main outcome measures Debrunner's kyphometer was used for measuring the difference between thoracic kyphosis and lumbar lordosis of the spine. All subjects also answered a questionnaire including questions about ski-related low back pain, the amount of ski training, and participation in other sports. Results The results at the end of the 5-year period comprise data from 15 skiers (M age=18.5±0.9 years). The relationship between thoracic kyphosis and lumbar lordosis increased from 3.5° to 13.1°, respectively (p=0.0001). Of the 15 elite cross-country skiers, seven reported low back pain at the 5-year examination. At the 5-year follow-up, skiers with low back pain showed significantly higher relationship between thoracic kyphosis and lumbar lordosis than did those skiers without low back pain, 18.2° and 10.5°, respectively (p=0.035). Of the eight elite cross-country skiers without low back pain, seven were also involved in other sports (p=0.005). Conclusions Based on these findings, our advice is that adolescent cross-country skiers also should participate in other physical activities besides cross-country skiing.

  • 2.
    Ryman Augustsson, Sofia
    et al.
    Lund University.
    Tranberg, Roy
    University of Gothenburg.
    Zugner, Roland
    University of Gothenburg.
    Augustsson, Jesper
    Linnaeus University, Faculty of Social Sciences, Department of Sport Science.
    Vertical drop jump landing depth influences knee kinematics in female recreational athletes2018In: Physical Therapy in Sport, ISSN 1466-853X, E-ISSN 1873-1600, Vol. 33, no 5, p. 133-138Article in journal (Refereed)
    Abstract [en]

    Objectives

    To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes. The purpose was also to identify whether leg muscle strength is a predictive factor for knee control during a VDJ.

    Design

    Cross-sectional.

    Setting

    Biomechanics laboratory. Participants: Eighteen women aged between 18-30 years.

    Main Outcome Measures

    Three VDJ tests were used for biomechanical analysis: 1) small “bounce” jump (BJ), 2) deep “countermovement” jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects also performed an isometric knee-extension strength test, dichotomized to ‘weak’ versus ‘strong’ subjects according to median and quartiles.

    Results

    There were greater knee valgus angles during landing for both the CMJW and CMJN test compared to the BJ test (p≤0.05). Differences in knee valgus between weak and strong subjects were significant for the BJ test (p=0.044) but not for any of the other tests.

    Conclusions

    VDJ landing depth influences knee kinematics in women. Landing depth may therefore be considered when screening athletes using the VDJ test. Also, muscle strength seems to influence the amount of knee valgus angles, but the difference was not statistically significant (except for the BJ test) in this small cohort.

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