Diseño y validación de contenido de un cuestionario sobre Pérdida de Peso en Deportes de Combate (PPDC) / Projeto e conteúdo validação de um questionário sobre a perda de peso no Combat Sports (PPDC) / Design and content validation of a questionnaire on Weight Loss in Combat Sports (PPDC)

El sistema de categorías por peso que rige los deportes de combate fomenta en estos atletas la puesta en práctica de determinados métodos y estrategias para reducir su masa corporal antes del pesaje oficial, así como otros hábitos y protocolos de rápida rehidratación y rellenado de las reservas energéticas en el lapso de tiempo (6-20 h) que separa este pesaje oficial del comienzo del torneo. El objetivo de este trabajo fue diseñar y validar por primera vez un instrumento que permita estudiar los hábitos que están llevando a cabo los deportistas de combate durante las fases de pérdida de peso y su posterior recuperación antes del torneo. Tras el diseño original del cuestionario, se verificó la validez de contenido y la validez estructural del instrumento a través del acuerdo y consenso de 12 jueces expertos. En segundo lugar, se realizó un estudio de la validez de compresión de los ítems que compone el instrumento con una muestra de 46 deportistas de combate experimentados. Así mismo, se calculó la fiabilidad mediante la aplicación de la prueba test-retest en una muestra de 28 deportistas. Los resultados indicaron que el cuestionario sobre pérdida de peso en deportes de combate presenta óptimos niveles de validez de contenido así como de reproducibilidad en las respuestas para identificar y monitorizar los métodos, las frecuencias y las estrategias con las que estos deportistas acometen las fases de pérdida de peso antes del pesaje y su posterior recuperación antes del comienzo del torneo (AU)

The weight classes system established for most of the combat sports promotes the implementation of methods and strategies to reduce the athletes´ body mass before the official weigh-in, and other habits and protocols of fast rehydration and fill the energy reserves in the period of time (6-20 h) that separate the official weigh-in and the beginning of the tournament. The aim of this study was to design and validate for the first time a questionnaire to assess the habits that are conducting by the combat sport athletes during the phases of weight loss and the subsequent recovery. After the original design of the questionnaire, we verified the construct validity and structural validity of the instrument through agreement and consensus of 12 expert judges. Second, we conducted a study of the compression validity and reliability of the items that compose the instrument using a sample of 46 experienced combat athletes. The results indicated that the weight loss in combat sports questionnaire provides optimal levels of content validity, as well as reliability in their answerers that allows researchers and coaches to identify and monitor the methods, frequencies and strategies that these kind of athletes carry out during the rapid weight loss phases before the official weigh-in and the subsequent recovery phases before the start of the tournament (AU)

Sistema de categorias por peso que rege os esportes de combate promove nestes atletas que colocar em prática certos métodos e estratégias para reduzir a sua massa corporal antes da pesagem oficial, bem como outros hábitos e protocolos de hidratação rápida e acolchoado das reservas energia no lapso de tempo (6-20 h) que separa esta pesagem oficial do início do torneio. Objetivo deste trabalho foi o projeto e validar pela primeira vez, um instrumento que permitem estudá-los hábitos que levam para fora os atletas de combate durante as fases de perda de peso e sua posterior recuperação antes do torneio. Após o desenho original do questionário, verificou-se a validade de conteúdo e a validade estrutural do instrumento através de acordo e consenso dos 12 juízes especializados. Em segundo lugar, um estudo da validade da compressão dos itens compondo o instrumento com uma amostra de 46 experientes atletas de combate. Da mesma forma, foi calculada através da aplicação de teste de confiabilidade teste-reateste em uma amostra de 28 atletas. Os resultados indicaram que o inquérito sobre a perda de peso em esportes de combate apresenta os níveis ideais de validade de conteúdo, bem como a reprodutibilidade em respostas para identificar e monitorar estratégias que estes atletas realizar estágios de perda de peso antes da pesagem e sua subsequente recuperação antes do início do torneio, frequências e métodos (AU)

Muscle contraction velocity, strength and power output changes following different degrees of hypohydration in competitive olympic combat sports.

BACKGROUND: It is habitual for combat sports athletes to lose weight rapidly to get into a lower weight class. Fluid restriction, dehydration by sweating (sauna or exercise) and the use of diuretics are among the most recurrent means of weight cutting. Although it is difficult to dissuade athletes from this practice due to the possible negative effect of severe dehydration on their health, athletes may be receptive to avoid weight cutting if there is evidence that it could affect their muscle performance. Therefore, the purpose of the present study was to investigate if hypohydration, to reach a weight category, affects neuromuscular performance and combat sports competition results. METHODS: We tested 163 (124 men and 39 woman) combat sports athletes during the 2013 senior Spanish National Championships. Body mass and urine osmolality (UOSM) were measured at the official weigh-in (PRE) and 13-18 h later, right before competing (POST). Athletes were divided according to their USOM at PRE in euhydrated (EUH; UOSM 250-700 mOsm · kgH2O(-1)), hypohydrated (HYP; UOSM 701-1080 mOsm · kgH2O(-1)) and severely hypohydrated (S-HYP; UOSM 1081-1500 mOsm · kgH2O(-1)). Athletes' muscle strength, power output and contraction velocity were measured in upper (bench press and grip) and lower body (countermovement jump - CMJ) muscle actions at PRE and POST time-points. RESULTS: At weigh-in 84 % of the participants were hypohydrated. Before competition (POST) UOSM in S-HYP and HYP decreased but did not reach euhydration levels. However, this partial rehydration increased bench press contraction velocity (2.8-7.3 %; p < 0.05) and CMJ power (2.8 %; p < 0.05) in S-HYP. Sixty-three percent of the participants competed with a body mass above their previous day's weight category and 70 of them (69 % of that sample) obtained a medal. CONCLUSIONS: Hypohydration is highly prevalent among combat sports athletes at weigh-in and not fully reversed in the 13-18 h from weigh-in to competition. Nonetheless, partial rehydration recovers upper and lower body neuromuscular performance in the severely hypohydrated participants. Our data suggest that the advantage of competing in a lower weight category could compensate the declines in neuromuscular performance at the onset of competition, since 69 % of medal winners underwent marked hypohydration.