Search results for "Single group"
showing 4 items of 4 documents
Performance under Pressure on the Court: Evidence from Professional Volleyball
2018
This study analyzes how psychological pressure affects performance. It refers to the discussion on differences between choking, i.e., an acute performance decline under pressure and under- performance under pressure. When performance outcomes are not defined binary even slight performance decrements can have huge consequences for future career. To study the conse- quences of psychological pressure on performance, we employ data on the serving performance of 213 professional volleyball athletes in 226 matches. We do not find any evidence for the existence of severe performance decrements under pressure (i.e. choking). However, athletes serve less effectively under pressure, i.e., they serve …
Rolling Psychodynamic Group for Cocaine Use Disorder: A Single-Group Study Using Multilevel Models
2017
Cocaine disorder has been shown to have an important impact on the success of treatments because it is often associated with social or occupational impairment, high relapse incidences and poor trea...
Group analytic therapy for eating disorders: preliminary results in a single-group study.
2008
Objectives There is a lack of empirical data on the effectiveness and process of group-analytic therapy in eating disorders. This single-group study aimed to explore the effectiveness of such treatment for anorexic and bulimic individuals. Method Eight patients (three anorexic and five bulimic women) entered group-analytic treatment, meeting weekly for 2 years. Eating behaviours, overall psychological distress and group process variables were regularly assessed using quantitative and qualitative measures, with comparisons made at the beginning and end of the therapy. Results Treatment was discontinued in two cases. When outcome was classified on the basis of reliable change and clinical sig…
Macrophyte and macroinvertebrate patterns in unimpacted mountain rivers of two European ecoregions
2017
The aim of the study was to compare the patterns of development of macrophytes and macroinvertebrates in different types of reference mountain rivers. The study is based on reference river sites surveyed throughout the mountains in Poland and Slovakia in two European ecoregions (9—Central Highlands, 10—The Carpathians). A wide range of environmental variables were estimated, including water chemistry, hydromorphology, geology, and the spatial factor. Based on the Jaccard index, macrophyte and macroinvertebrate variation was confirmed between four mountain and upland river types. It was found that the biological diversification is mainly influenced by geological and associated chemical facto…