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  • 1.
    Antonopoulos (Kvist), Joanna
    et al.
    Linköping University, Department of Medical and Health Sciences, Sports Medicine . Linköping University, Faculty of Health Sciences.
    Gillquist, Jan
    Linköping University, Department of Medical and Health Sciences, Sports Medicine . Linköping University, Faculty of Health Sciences.
    Anterior tibial translation related to isokinetic concentric quadriceps torques1996In: Isokinetics and exercise science, ISSN 0959-3020, E-ISSN 1878-5913, Vol. 6, no 2, p. 145-151Article in journal (Refereed)
    Abstract [en]

    Sagittal translation of the tibia was examined in a static test with 90 N force at 20°of knee flexion and dynamically during knee extension in a Biodex machine using increasing quadriceps torque in six healthy volunteers. The translation increased in a non-linear fashion with increasing torque. Similar relative increases in quadriceps torque caused similar relative increases in translation in the different individuals. The dynamic translation at the individual maximum quadriceps torque was equal to the static 90-N translation. There was a negative correlation between the maximum quadriceps torque and the static 90-N translation. The results indicate that the quadriceps torque is related to the amount of translation in the knee joint possibly by some feed back mechanism from the ligaments preventing abnormal translation. The findings also imply that a limitation of quadriceps torque around 80% of maximum would limit the strain in an injured ligament to a level not higher than what is caused by normal laxity measurements.

  • 2.
    Bohannon, Richard W.
    et al.
    School of Allied Health, University of Connecticut, Storrs, CT, United States.
    Peolsson, Anneli
    Linköping University, Department of Department of Health and Society. Linköping University, Faculty of Health Sciences.
    Massy-Westropp, Nicola
    School of Health Sciences, University of South Australia, Adelaide, SA, Australia.
    Consolidated reference values for grip strength of adults 20 to 49 years: a descriptive meta-analysis2006In: Isokinetics and exercise science, ISSN 0959-3020, E-ISSN 1878-5913, Vol. 14, no 3, p. 221-224Article in journal (Refereed)
    Abstract [en]

    Building on a previous meta-analysis, this study focused on the utility of consolidating grip strength data from apparently healthy subjects 20-49 years of age. All data were obtained using a Jamar dynamometer and procedures generally consistent with the recommendations of the American Society of Hand Therapists. The meta-analysis revealed that the seven sources provided homogeneous data (Q = 0.21 -0.81, p ≥ 0.667) for the left and right sides of men and women subjects. Means and confidence intervals are provided that can be used to interpret the normality of grip strength obtained from men and women 20-49 years of age. By consolidating the data from multiple studies conducted in five countries, a better overall estimate of normal is obtained. Providing reference values for three decades combined simplifies normative comparisons.

  • 3.
    Gomez-Piqueras, Pedro
    et al.
    Univ Castilla La Mancha, Spain.
    Gonzalez-Villora, Sixto
    Univ Castilla La Mancha, Spain.
    Grassi, Alberto
    Ist Ortoped Rizzoli, Italy.
    Gojanovic, Boris
    Hop Tour, Switzerland.
    Hägglund, Martin
    Linköping University, Department of Medical and Health Sciences, Division of Physiotherapy. Linköping University, Faculty of Medicine and Health Sciences.
    Waldén, Markus
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences.
    Are we making SMART decisions regarding return to training of injured football players? Preliminary results from a pilot study2018In: Isokinetics and exercise science, ISSN 0959-3020, E-ISSN 1878-5913, Vol. 26, no 2, p. 115-123Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: "When will I be able to play again?" is the most frequent question asked by injured athletes. Due to the complex nature of sports injury, deciding when an injured athlete may safely return to training is a critical and difficult decision. OBJECTIVE: To study if the Safe Multidimensional Algorithm for Return to Training (SMART) scores, applied before the release to full return to training after injury differs between football players who suffer a subsequent re-injury and football players who do not. METHOD: Seventy one male professional football players were prospectively monitored for injuries during two seasons. The SMART tool was applied in injured players with an absence amp;gt; 10 days. The injured player had to carry out 17 multidimensional tests included in the algorithm in his final days of the planned rehabilitation. The results of the SMART were compared between players who sustained re-injuries and those who did not. RESULTS: Fifty-five injuries with absence amp;gt; 10 days were recorded and re-injuries occurred in 12 of these cases (22%). There was a lower re-injury rate in players who presented a better recovery in pain (p amp;lt; 0.001), agility (RR 21.0, 95% CI: 2.0 to 213.2), advanced agility (RR 26.7, 95% CI: 4.9 to 142.8), anxiety (RR 8.6, 95% CI: 2.0 to 36.2), depression (RR 10.3, 95% CI: 1.5 to 65.7), self-perception (p amp;lt; 0.001), advanced skills mode (RR 20.5, 95% CI: 3.3 to 125.9) and group skills mode (p amp;lt; 0.001). CONCLUSIONS: A multidimensional approach of Return to Training that includes objective measures may indicate potential deficiencies in the recovery of injured players.

  • 4.
    Kadi, Fawzi
    et al.
    Örebro Universitet.
    Buskqvist, Lars
    Örebro Universitet.
    Sjöholm, Oskar
    Örebro Universitet.
    Folkesson, Mattias
    Örebro Universitet.
    Karlsson, Stefan
    Umeå Universitet.
    Gerdle, Björn
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Rehabilitation Medicine. Östergötlands Läns Landsting, Centre for Medicine, Pain and Rehabilitation Centre.
    Strength, muscular endurance and EMG characteristics of thigh adductors2006In: Isokinetics and exercise science, ISSN 0959-3020, E-ISSN 1878-5913, Vol. 14, no 3, p. 235-239Article in journal (Refereed)
    Abstract [en]

    The assessment of thigh adductors' strength and endurance and electromyographical (EMG) characteristics has received little attention compared to other muscle groups. The aim of this study was to investigate strength, endurance performance and EMG characteristics of m. adductor longus and m. gracilis during concentric thigh adduction in soccer and bandy players. Muscular endurance was evaluated using the torque reduction during 70 repeated maximum concentric adductions at an angular velocity of 60°/s. The EMG mean frequency (MNF) and the signal amplitude ratio (SAR, index for muscles' ability to relax between contractions) were analysed. Peak torque decreased significantly throughout the test and no significant differences were found between the two groups. In both muscles, MNF decreased significantly throughout the test. There were no significant differences in MNF and in SAR variables between soccer and bandy players. In conclusion, the present findings reveal a number of significant aspects related to strength and electromyography of hip adductors. © 2006 - IOS Press and the authors. All rights reserved.

  • 5.
    Larsson, Barbro
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Rehabilitation Medicine. Linköping University, Faculty of Health Sciences.
    Karlsson, Stefan
    Department of Biomedical Engineering and Informatics, Umeå University Hospital, Umeå, Sweden.
    Gerdle, Björn
    Linköping University, Department of Clinical and Experimental Medicine, Rehabilitation Medicine. Östergötlands Läns Landsting, Centre for Medicine, Pain and Rehabilitation Centre. Linköping University, Faculty of Health Sciences.
    Muscle performance during maximum repeated knee extensions in children with hemiplegic cerebral palsy2008In: Isokinetics and exercise science, ISSN 0959-3020, E-ISSN 1878-5913, Vol. 16, no 4, p. 221-230Article in journal (Refereed)
    Abstract [en]

    The aim of the present study was to compare isokinetic muscle performance of the knee extensors including surface EMG during repetitive maximum contractions between children with hemiplegic CP and healthy controls. A group of children with hemiplegic cerebral palsy (CP) (16 boys and eight girls; mean age 11 years with SD 2; range 7 to 15 years) and a control group (14 boys and eight girls; mean age 10 years with SD 2; range 7 to 15 years) participated. The relationships between maximum peak torque and the surface electromyography (EMG) variable root mean square (RMS) were obtained during 100 concentric knee extensions at 90°/s. Surface EMG was recorded from rectus femoris, vastus lateralis, and biceps femoris. The children with CP were also tested using Gross Motor Function Measure (GMFM). There were no differences between the groups in muscle endurance for the younger children. The results indicated that the children with CP had less strength enhancement in the hemiplegic leg during puberty. Peak torque correlated with GMFM and with RMS in rectus femoris and vastus lateralis. Co-activation was found in biceps femoris, but it did not affect muscle strength.

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