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      The Influence of Warm-Up on Body Temperature and Strength Performance in Brazilian National-Level Paralympic Powerlifting Athletes

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          Abstract

          Background and Objectives: The effects of warm-up in athletic success have gained strong attention in recent studies. There is, however, a wide gap in awareness of the warm-up process to be followed, especially in Paralympic powerlifting (PP) athletes. This study aimed to analyze different types of warm-up on the physical performance of PP athletes. Materials and Methods: The sample consisted of 12 elite Brazilian PP male athletes (age, 24.14 ± 6.21 years; bodyweight, 81.67 ± 17.36 kg). The athletes performed maximum isometric force (MIF), rate of force development (RFD), and speed test (Vmax) in three different methods of warm-up. Tympanic temperature was used to estimate the central body temperature. Results: A significant difference was observed for MIF in the without warm-up (WW) condition in relation to the traditional warm-up (TW) and stretching warm-up (SW) ( p = 0.005, η 2 p = 0.454, high effect). On the contrary, no significant differences were observed in RFD, fatigue index (FI) and time in the different types of warm up ( p > 0.05). Furthermore, no significant differences were observed in relation to the maximum repetition ( p = 0.121, η 2 p = 0.275, medium effect) or the maximum speed ( p = 0.712, η 2 p = 0.033, low effect) between the different types of warm up. In relation to temperature, significant differences were found for the TW in relation to the “before” and “after” conditions. In addition, differences were found between WW in the “after” condition and SW. In addition, WW demonstrated a significant difference in relation to TW in the “10 min later” condition (F = 26.87, p = 0.05, η 2 p = 0.710, high effect). Conclusions: The different types of warm-up methods did not seem to provide significant differences in the force indicators in elite PP athletes.

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          A power primer.

          One possible reason for the continued neglect of statistical power analysis in research in the behavioral sciences is the inaccessibility of or difficulty with the standard material. A convenient, although not comprehensive, presentation of required sample sizes is provided here. Effect-size indexes and conventional values for these are given for operationally defined small, medium, and large effects. The sample sizes necessary for .80 power to detect effects at these levels are tabled for eight standard statistical tests: (a) the difference between independent means, (b) the significance of a product-moment correlation, (c) the difference between independent rs, (d) the sign test, (e) the difference between independent proportions, (f) chi-square tests for goodness of fit and contingency tables, (g) one-way analysis of variance, and (h) the significance of a multiple or multiple partial correlation.
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            Post-activation Potentiation Versus Post-activation Performance Enhancement in Humans: Historical Perspective, Underlying Mechanisms, and Current Issues

            Post-activation potentiation (PAP) is a well-described phenomenon with a short half-life (~28 s) that enhances muscle force production at submaximal levels of calcium saturation (i.e., submaximal levels of muscle activation). It has been largely explained by an increased myosin light chain phosphorylation occurring in type II muscle fibers, and its effects have been quantified in humans by measuring muscle twitch force responses to a bout of muscular activity. However, enhancements in (sometimes maximal) voluntary force production detected several minutes after high-intensity muscle contractions are also observed, which are also most prominent in muscles with a high proportion of type II fibers. This effect has been considered to reflect PAP. Nonetheless, the time course of myosin light chain phosphorylation (underpinning “classic” PAP) rarely matches that of voluntary force enhancement and, unlike PAP, changes in muscle temperature, muscle/cellular water content, and muscle activation may at least partly underpin voluntary force enhancement; this enhancement has thus recently been called post-activation performance enhancement (PAPE) to distinguish it from “classical” PAP. In fact, since PAPE is often undetectable at time points where PAP is maximal (or substantial), some researchers have questioned whether PAP contributes to PAPE under most conditions in vivo in humans. Equally, minimal evidence has been presented that PAP is of significant practical importance in cases where multiple physiological processes have already been upregulated by a preceding, comprehensive, active muscle warm-up. Given that confusion exists with respect to the mechanisms leading to acute enhancement of both electrically evoked (twitch force; PAP) and voluntary (PAPE) muscle function in humans after acute muscle activity, the first purpose of the present narrative review is to recount the history of PAP/PAPE research to locate definitions and determine whether they are the same phenomena. To further investigate the possibility of these phenomena being distinct as well as to better understand their potential functional benefits, possible mechanisms underpinning their effects will be examined in detail. Finally, research design issues will be addressed which might contribute to confusion relating to PAP/PAPE effects, before the contexts in which these phenomena may (or may not) benefit voluntary muscle function are considered.
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              Exercise and Fatigue

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                Author and article information

                Journal
                Medicina (Kaunas)
                medicina
                Medicina
                MDPI
                1010-660X
                1648-9144
                14 October 2020
                October 2020
                : 56
                : 10
                : 538
                Affiliations
                [1 ]Department of Physical Education, Tiradentes University (UNIT), Aracaju, Sergipe 49010-390, Brazil; roberta.resende@ 123456souunit.com.br (R.B.V.R.); gracielle.reis@ 123456souunit.com.br (G.C.R.); madson.rodrigo@ 123456souunit.com.br (M.R.S.B.)
                [2 ]Group of Studies and Research of Performance, Sport, Health and Paralympic Sports (GEPEPS), Federal University of Sergipe (UFS), São Cristovão, Sergipe 49100-000, Brazil; layanneoliveira@ 123456cepiexpansao.com.br (L.d.O.B.); dihogogmc@ 123456hotmail.com (D.G.d.M.); acmarcal@ 123456academico.ufs.br (A.C.M.); fjaidar@ 123456academico.ufs.br (F.J.A.)
                [3 ]Program of Physical Education, Federal University of Sergipe (UFS), São Cristovão, Sergipe 49100-000, Brazil
                [4 ]Department of Physical Education, Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte 59078-970, Brazil; paulo220911@ 123456hotmail.com (P.F.d.A.-N.); brenotcabral@ 123456gmail.com (B.G.d.A.T.C.)
                [5 ]Department of Sport Sciences, University of Beira Interior, 6201-001 Covilhã, Portugal; henriquepn@ 123456gmail.com (H.P.N.); dmarinho@ 123456ubi.pt (D.A.M.); mmarques@ 123456ubi.pt (M.C.M.)
                [6 ]Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Trás os Montes and Alto Douro University, 5001-801 Vila Real, Portugal; victormachadoreis@ 123456gmail.com
                [7 ]Department of Physical Education, Federal University of Sergipe (UFS), São Cristovão, Sergipe 49100-000, Brazil
                [8 ]Program of Physiological Science, Federal University of Sergipe (UFS), São Cristovão, Sergipe 49100-000, Brazil
                Author notes
                Author information
                https://orcid.org/0000-0002-7394-8527
                https://orcid.org/0000-0002-2860-2260
                https://orcid.org/0000-0002-9966-9956
                https://orcid.org/0000-0001-9283-312X
                https://orcid.org/0000-0002-8105-7580
                Article
                medicina-56-00538
                10.3390/medicina56100538
                7602261
                33066417
                09e613e8-c69d-4bf3-bd04-4c2bbaed2302
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 26 August 2020
                : 06 October 2020
                Categories
                Article

                warm-up,powerlifting paralympic,athletes,strength,temperature

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