538 research outputs found

    Exploring the Impact of Different Durations of Foam Rolling as a Recovery Technique following Intense Exercise in College-aged Males

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    Background: Foam rolling (FR) for recovery from delayed onset muscle soreness (DOMS) and exercise induced muscle damage (EIMD) has received considerable attention because the technique is being a relatively inexpensive and is self-performed. However, there are currently no FR guidelines and the available literature assessing the impact of FR for recovery of muscle soreness is heterogeneous and offers conflicting results. Assessing different FR durations and their impact on recovery may help provide insight to the effectiveness of this technique for recovery from EIMD and DOMS. Purpose: To explore the impact of two different acute durations of FR for the recovery of vertical jump (VJ), sprint speed (SS), agility, range of motion (ROM), and pain/soreness following high intensity exercise. Methods: An experimental, randomized cross-over design was used consisting of twelve college-aged males were randomly assigned to a one- or two-minute FR group (EXP) (N = 6 per group) and served as their own control (CON). Participants completed a familiarization and baseline measure session before completing two, 4-session testing weeks (1-week EXP, 1-week CON) separated by a 1-week washout period. Session one employed the EIMD protocol and immediate post exercise measures taken. Sessions 2-4 were 24, 48, and 72 hr. post measures. FR (either 1 or 2-minutes) was completed during the EXP week on each lower extremity muscle group following the immediate post exercise measures, whereas CON did not complete FR. Results: No significant difference was seen between EXP groups at any time point post exercise for recovery of jump height (F=.007, P=.933), agility (F=.171, P=.681), sprint speed (F=.024, P=.876), ROM (F=.013, P=1.000), or pain/soreness (F=.000, P=.909). Conclusion: Foam rolling for either 1 or 2-minutes per muscle group immediately post exercise did not significantly aid in recovery of muscle soreness as measured by its impact on performance and non-performance outcomes. Therefore, FR using the protocol applied in this study, in the lower extremities immediately following high-intensity exercise may not be beneficial for recovering from DOMS in college-aged males

    Distribution and toxicity of Cylindrospermopsis raciborskii (Cyanobacteria) in Portuguese freshwaters

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    The cyanobacterium Cylindrospermopsis racborskii has become increasingly prevalent in freshwaters worldwide. This species is of concern from a water quality perspective due to its known ability to produce a potent hepatotoxic alkaloid cylindrospermopsin, which has been implicated in outbreaks of human sickness and cattle mortality. C. raciborskii isolates from Brazil have also been found to produce the highly toxic paralytic shellfish poisons (PSP's). In this paper we report the toxicity of four isolates of C. raciborskii taken from three reservoirs and one river in Portugal as well as the occurrence of this species in other water bodies used for potable and recreational purposes. All four isolates grown in pure culture in the laboratory were found to be toxic in the mouse bioassay at 8 - 24 hours after intraperitoneal administration of single doses ranging from 1337 to 1572 mg kg-1. Histological examination showed liver damage as the primary lesion, in addition to some inflammation in the intestine. HPLC/MS tests for the presence of cylindrospermopsin, microcystins and PSP toxins were negative. The available evidence suggests that another toxin may be present. This report constitutes the first report of toxic C. raciborskii in Europe and draws attention to our need for increased monitoring of this cyanobacterium in water bodies used for potable and recreational purposes.La cianobacteria Cylindrospermopsis racborskii ha incrementado su presencia en agua dulce por todo el mundo. Esta especie es de gran importancia debido a su conocida capacidad para producir un alcaloide hepatotóxico, cilindrospermopsina. Esta toxina es responsable de enfermedades en humanos y mortalidad en ganado. Cepas de C. raciborskii aisladas de Brasil se ha demostrado que tienen capacidad para producir la toxina paralytic shellfish poisons (PSP's). En este trabajo hemos estudiado la presencia de esta especie en agua dulce con usos recreacionales y de abastecimiento en Portugal. De las cuatro cepas C. raciborskii aisladas de tres embalses y de un río estudiamos la toxicidad con bioensayos en ratones. Todas presentaron toxicidad al cabo de las 8 - 24 horas tras inyección intraperitoneal, la dosis presenta un rango de concentración de 1337 a 1572 mg kg-1. La examinación histológica reveló daños en el hígado y señales inflamatorias en el intestino. Los análisis con HPLC/MS revelaron la ausencia de cilindrospermopsina, microcistinas y PSP, sugiriendo que otra toxina podría estar presente para las cepas aisladas y cultivadas en laboratorio. Este artículo es el primero acerca de la toxicidad de C. raciborskii en Europa y refleja la necesidad de aumentar el monitoreo de esta cyanobacteria en el agua potable y con fines recreativos

    The benefits of using reduced item variable scales in marketing segmentation

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    This study investigated the use of two reduced item constructs in marketing research, Involvement Scale and Consumer Expertise and their relationships. Previous findings suggested that both constructs could use reduced items and that they would be useful as marketing segmentation tools. Response rates to consumer questionnaires are declining; therefore, shorter questionnaires in marketing communications are more likely to be completed. This study establishes the current reliability of using these two reduced item constructs in automotive research and tests their validity using triangulation questions. Data collection used a novel approach in which respondents to a motor show used the new Apple iPad to complete an online questionnaire. Results revealed that the reduced item constructs are reliable and valid and would be useful for research involving large ticket items. They would be particularly useful to researchers where they are used as part of, rather than the main focus of, the research
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