Translation, Cross-cultural Adaptation, and Psychometric Properties of the German Version of the Hip Disability and Osteoarthritis Outcome Score

Item does not contain fulltextStudy Design Clinical measurement. Objectives To translate and cross-culturally adapt the Hip disability and Osteoarthritis Outcome Score (HOOS) from English into German, and to study its psychometric properties in patients after hip surgery. Background There is no specific hip questionnaire in German that not only measures symptoms and function but also contains items about hip-related quality of life. Methods The translation and cross-cultural adaptation involved forward translation, harmonization, cognitive debriefing, back translation, and comparison to the original HOOS following international guidelines. The German version was tested in 51 Swiss inpatients 8 weeks after different types of hip surgery, mainly total hip replacement. The mean age of the participants was 62.5 years, and the age range was from 27 to 87 years. Thirty (58.8%) of the participants were women. Internal consistency and test-retest reliability were estimated using Cronbach alpha and intraclass correlation coefficients for agreement. For construct validity, total scores of the German HOOS were correlated with those of the Western Ontario and McMaster Universities Osteoarthritis Index. The HOOS was also compared to the Medical Outcomes Study 36-Item Short-Form Health Survey. Results Cronbach alpha values for all German HOOS subscales were between .87 and .93. For test-retest reliability, the intraclass correlation coefficient for agreement was 0.85 for the total scores of the German HOOS. The Spearman rho for the Medical Outcomes Study 36-Item Short-Form Health Survey physical functioning subscale compared to the sum of all HOOS subscales was 0.71, and that for the Medical Outcomes Study 36-Item Short-Form Health Survey physical component summary was 0.97. Conclusion The German HOOS has demonstrated adequate reliability and validity. Use of the German HOOS is recommended for assessment of patients after hip surgery, with the proviso that additional psychometric testing should be done in future research. J Orthop Sports Phys Ther 2014;44(12):989-997. Epub 13 November 2014. doi:10.2519/jospt.2014.4994

Electromyographic activity of back muscles during stochastic whole body vibration

OBJECTIVES: Stochastic resonance whole body vibrations (SR-WBV) may reduce and prevent musculoskeletal problems (MSP). The aim of this study was to evaluate how activities of the lumbar erector spinae (ES) and of the ascending and descending trapezius (TA, TD) change in upright standing position during SR-WBV. METHODS: Nineteen female subjects completed 12 series of 10 seconds of SR-WBV at six different frequencies (2, 4, 6, 8, 10, 12Hz) and two types of "noise"-applications. An assessment at rest had been executed beforehand. Muscle activities were measured with EMG and normalized to the maximum voluntary contraction (MVC%). For statistical testing a three-factorial analysis of variation (ANOVA) was applied. RESULTS: The maximum activity of the respective muscles was 14.5 MVC% for the ES, 4.6 MVC% for the TA (12Hz with "noise" both), and 7.4 MVC% for the TD (10Hz without "noise"). Furthermore, all muscles varied significantly at 6Hz and above (p⋜0.047) compared to the situation at rest. No significant differences were found at SR-WBV with or without "noise". CONCLUSIONS: In general, muscle activity during SR-WBV is reasonably low and comparable to core strength stability exercises, sensorimotor training and "abdominal hollowing" in water. SR-WBV may be a therapeutic option for the relief of MSP

Acute effects of fast dynamic stretching on rate of force development in ice hockey players: a pilot study

Hintergrund: Schnelles dynamisches Dehnen wirkt sich auf eine direkte Vorbereitung einer Schnellkraftleistung leistungsfördernd aus. Das Ziel dieser Pilotstudie war daher, den Einfluss des schnellen dynamischen Dehnens (SDD) des M. glutaeus maximus auf die Schnellkraft bei Eishockeyspielern zu untersuchen. Probanden/Methoden: An dieser Studie nahmen 12 gesunde Eishockeyspieler teil. Die Intervention basierte auf einer schnellen dynamischen Dehnung des M. glutaeus maximus. Vor und nach der Intervention wurde die Schnellkraft mittels DJ ermittelt, indem die Bodenkontaktzeit und die Sprunghöhe sowie die Sprintzeit auf dem Eis über 20 m gemessen wurden. Die Daten wurden mittels Mann-Whitney-U-Test und Wilcoxon-Vorzeichen-Rangsummentest ausgewertet. Ergebnisse: Es zeigte sich eine signifikante Verlängerung der Bodenkontaktzeit. Die Sprunghöhe und die Sprintzeit zeigten keine signifikanten Unterschiede. Schlussfolgerung: Diese Pilotstudie zeigt, dass die SDD-Intervention am M. glutaeus maximus keinen Einfluss auf die Schnellkraft hat. Für kommende Studien ist es ratsam, das Studienprotokoll hinsichtlich zu dehnender Muskelgruppen der Strecker- und Beugerschlingen zu optimieren.Background: Fast dynamic stretching has a positive effect on rate of force development in ice hockey players. The aim of this pilot study was to evaluate the influence of fast dynamic stretching (FDS) of the gluteus maximus muscle on rate of force development. Subjects/Methods: This study included 12 healthy ice hockey players. The intervention was based on a fast dynamic stretching of the gluteus maximus muscle. For quantification, measurements were performed before and after the intervention. The rate of force development was determined by using the drop jump (DJ) for ground contact time and jump height, and sprint time was measured on ice over 20 meters. Results: The intervention showed significant extension of the ground reaction time. The jump height and the sprint time showed no significant differences after FDS intervention. Conclusion: The data in this present randomised controlled pilot study showed that FDS interventions on the gluteus maximus muscle have no influence on rate of force development. For future studies, it is recommended that the study protocol should be modified with regard to determining the stretched muscle groups. Furthermore, the FDS intervention on the gluteus maximus muscle showed no positive influence on DJ and sprint