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      Reproducibility and Repeatability of Five Different Technologies for Bar Velocity Measurement in Resistance Training

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          Is Open Access

          Method agreement analysis: a review of correct methodology.

          The correct approach to analyzing method agreement is discussed. Whether we are considering agreement between two measurements on the same samples (repeatability) or two individuals using identical methodology on identical samples (reproducibility) or comparing two methods, appropriate procedures are described, and worked examples are shown. The correct approaches for both categorical and numerical variables are explained. More complex analyses involving a comparison of more than two pairs of data are mentioned and guidance for these analyses given. Simple formulae for calculating the approximate sample size needed for agreement analysis are also given. Examples of good practice from the reproduction literature are cited, and common errors of methodology are indicated. 2010 Elsevier Inc. All rights reserved.
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            Reliability, repeatability and reproducibility: analysis of measurement errors in continuous variables.

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              Effects of velocity loss during resistance training on athletic performance, strength gains and muscle adaptations

              We compared the effects of two resistance training (RT) programs only differing in the repetition velocity loss allowed in each set: 20% (VL20) vs 40% (VL40) on muscle structural and functional adaptations. Twenty-two young males were randomly assigned to a VL20 (n = 12) or VL40 (n = 10) group. Subjects followed an 8-week velocity-based RT program using the squat exercise while monitoring repetition velocity. Pre- and post-training assessments included: magnetic resonance imaging, vastus lateralis biopsies for muscle cross-sectional area (CSA) and fiber type analyses, one-repetition maximum strength and full load-velocity squat profile, countermovement jump (CMJ), and 20-m sprint running. VL20 resulted in similar squat strength gains than VL40 and greater improvements in CMJ (9.5% vs 3.5%, P < 0.05), despite VL20 performing 40% fewer repetitions. Although both groups increased mean fiber CSA and whole quadriceps muscle volume, VL40 training elicited a greater hypertrophy of vastus lateralis and intermedius than VL20. Training resulted in a reduction of myosin heavy chain IIX percentage in VL40, whereas it was preserved in VL20. In conclusion, the progressive accumulation of muscle fatigue as indicated by a more pronounced repetition velocity loss appears as an important variable in the configuration of the resistance exercise stimulus as it influences functional and structural neuromuscular adaptations.
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                Author and article information

                Journal
                Annals of Biomedical Engineering
                Ann Biomed Eng
                Springer Science and Business Media LLC
                0090-6964
                1573-9686
                April 12 2019
                Article
                10.1007/s10439-019-02265-6
                30980292
                3bfa4471-e96a-47ac-8b12-49ca07778d9b
                © 2019

                http://www.springer.com/tdm

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