@misc{HortobagyiLesinskiFernandezdelOlmoetal.2015, author = {Hortobagyi, Tibor and Lesinski, Melanie and Fernandez-del-Olmo, Miguel and Granacher, Urs}, title = {Small and inconsistent effects of whole body vibration on athletic performance: a systematic review and meta-analysis}, series = {European journal of applied physiology}, volume = {115}, journal = {European journal of applied physiology}, number = {8}, publisher = {Springer}, address = {New York}, issn = {1439-6319}, doi = {10.1007/s00421-015-3194-9}, pages = {1605 -- 1625}, year = {2015}, abstract = {We quantified the acute and chronic effects of whole body vibration on athletic performance or its proxy measures in competitive and/or elite athletes. Systematic literature review and meta-analysis. Whole body vibration combined with exercise had an overall 0.3 \% acute effect on maximal voluntary leg force (-6.4 \%, effect size = -0.43, 1 study), leg power (4.7 \%, weighted mean effect size = 0.30, 6 studies), flexibility (4.6 \%, effect size = -0.12 to 0.22, 2 studies), and athletic performance (-1.9 \%, weighted mean effect size = 0.26, 6 studies) in 191 (103 male, 88 female) athletes representing eight sports (overall effect size = 0.28). Whole body vibration combined with exercise had an overall 10.2 \% chronic effect on maximal voluntary leg force (14.6 \%, weighted mean effect size = 0.44, 5 studies), leg power (10.7 \%, weighted mean effect size = 0.42, 9 studies), flexibility (16.5 \%, effect size = 0.57 to 0.61, 2 studies), and athletic performance (-1.2 \%, weighted mean effect size = 0.45, 5 studies) in 437 (169 male, 268 female) athletes (overall effect size = 0.44). Whole body vibration has small and inconsistent acute and chronic effects on athletic performance in competitive and/or elite athletes. These findings lead to the hypothesis that neuromuscular adaptive processes following whole body vibration are not specific enough to enhance athletic performance. Thus, other types of exercise programs (e.g., resistance training) are recommended if the goal is to improve athletic performance.}, language = {en} } @article{KellisEllinoudisIntziegianni2017, author = {Kellis, Eleftherios and Ellinoudis, Athanasios and Intziegianni, Konstantina}, title = {Reliability of sonographic assessment of biceps femoris distal tendon strain during passive stretching}, series = {Ultrasound in Medicine \& Biology}, volume = {43}, journal = {Ultrasound in Medicine \& Biology}, publisher = {Elsevier}, address = {New York}, issn = {0301-5629}, doi = {10.1016/j.ultrasmedbio.2017.04.018}, pages = {1769 -- 1779}, year = {2017}, abstract = {The purpose of this study was to determine the intra-rater, inter-examiner and inter-observer reliability of biceps femoris long head (BFlh) tendon strain using ultrasound imaging. Nineteen patients (age: 20.4 +/- 0.35 y) were tested twice with a 1-wk interval. Each session included passive stretching from three different hip positions. Tests were performed independently by two examiners while BFlh tendon displacement (mm) and strain (\%) were manually extracted from ultrasound video footages by two observers. Intra-rater comparisons revealed an intra-class correlation coefficient (ICC2,1) range of 0.87 to 0.98 and a variability less than 4.74\%. Interexaminer comparisons revealed an ICC2,1 range of 0.83 to 0.99 and less than 4.69\% variability. Inter-observer ICCs ranged from 0.93 to 0.97 with variability less than 4.89\%. Using a well-defined scanning protocol, two experienced examiners attained high levels of intra-rater agreement, with similarly excellent results for inter-rater and inter-observer reliability for BFlh tendon displacement and strain. (E-mail: ekellis@phed-sr.auth.gr) (C) 2017 World Federation for Ultrasound in Medicine \& Biology.}, language = {en} } @article{BeijersbergenGranacherGaebleretal.2017, author = {Beijersbergen, Chantal M. I. and Granacher, Urs and Gaebler, Martijn and DeVita, Paul and Hortobagyi, Tibor}, title = {Hip mechanics underlie lower extremity power training-induced increase in old adults' fast gait velocity}, series = {Gait \& posture}, volume = {52}, journal = {Gait \& posture}, publisher = {Elsevier}, address = {Clare}, issn = {0966-6362}, doi = {10.1016/j.gaitpost.2016.12.024}, pages = {338 -- 344}, year = {2017}, abstract = {Methods: As part of the Potsdam Gait Study (POGS), healthy old adults completed a no-intervention control period (69.1 +/- 4A yrs, n =14) or a power training program followed by detraining (72.9 +/- 5.4 yrs, n = 15).We measured isokinetic knee extensor and plantarflexor power and measured hip, knee and ankle kinetics at habitual, fast and standardized walking speeds. Results: Power training significantly increased isokinetic knee extensor power (25\%), plantarflexor power (43\%), and fast gait velocity (5.9\%). Gait mechanics underlying the improved fast gait velocity included increases in hip angular impulse (29\%) and H1 work (37\%) and no changes in positive knee (K2) and A2 work. Detraining further improved fast gait velocity (4.7\%) with reductions in H1(-35\%), and increases in K2 (36\%) and A2 (7\%). Conclusion: Power training increased fast gait velocity in healthy old adults by increasing the reliance on hip muscle function and thus further strengthened the age-related distal-to-proximal shift in muscle function. (C) 2016 Elsevier B.V. All rights reserved.}, language = {en} }