Effects of lifestyle behaviours and depressed mood on sleep quality in young adults. A machine learning approach.

BACKGROUND: Modern lifestyles may lead to high stress levels, frequently associated with mood disorders (e.g. depressed mood) and sleep disturbance. The objective of this study was to develop a machine learning model aimed at identifying risk factors for developing poor sleep quality in young adults. MATERIAL AND METHODS: The sample consisted of 383 college-aged students (mean age ± SD: 21 ± 1 years; 61% males). Sleep quality, mood state, physical activity, number of sitting hours, and smartphone use were measured. RESULTS: A decision tree algorithm distinguished participants' sleep quality with 74% accuracy using a combination of four features: depressed mood, physical activity, sitting time, and vigour. Together with depressed mood, both physical activity (>6432 metabolic equivalent tasks -METs- per week) and sedentary behaviour (sitting time greater than 7 h/day) were the primary features that could differentiate those with poor sleep quality from those with good sleep quality. CONCLUSIONS: We provided a decision tree model with a sensitivity of 90.7% and a specificity of 54.3%, with an AUC of 0.725. These findings could promote improvements in prevention strategies and contribute to the development of meaningful and evidence-based intervention programs.

The Promotion of Physical Activity from Digital Services: Influence of E-Lifestyles on Intention to Use Fitness Apps.

E-Lifestyles are individual forms of behavior in the digital environment that reflect the values, activities, interests, and opinions of consumers. Likewise, fitness Apps are considered technological tools for promoting physical activity online. Although there are studies related to sports lifestyles, it has not been analyzed yet how e-lifestyles are related to the use of fitness Apps. Based on this, this study represents a step to clarify how e-lifestyles influence different relationships with perceived ease of use, perceived usefulness, attitude, and intentions to use Fitness Apps. Therefore, the objective of the study was to analyze the relationship between the e-lifestyles of consumers of Boutique fitness centers and their relationship with the perceived ease of use, the perceived usefulness, the attitude, and the intention to use Fitness Apps. The sample was 591 customers (378 women and 213 men) of 25 Boutique fitness centers. An online questionnaire was used for data collection. Data was analyzed with confirmatory factor analysis and structural equation model. Findings provide an insight into the importance of e-lifestyles in the intention of using fitness Apps and therefore in promoting physical activity through online fitness services. The results showed positive relationships between e-lifestyles, perceived ease of use, perceived usefulness and attitude toward fitness Apps. Finally, the attitude toward fitness Apps offered a very high predictive value on use intention. This study provides a better understanding of consumer´s intention to use fitness Apps. The conclusions and recommendations for sports managers of fitness centers highlight the importance of e-lifestyles as a predecessor for the use of fitness Apps.

Importance-Performance Matrix Analysis (IPMA) to Evaluate Servicescape Fitness Consumer by Gender and Age.

The fitness sector has always been linked to the analysis of the loyalty of its consumers. Different studies have shown the importance of sports service and human resources for greater customer loyalty. However, few works have studied how the physical environment or servicescape influences the behavior of consumers in fitness centers based on gender and age. Therefore, the objective of the study was to analyze the relationship between servicescape and the loyalty of fitness center consumers, analyzing through the Importance-Performance Matrix Analysis (IPMA) what the aspects to improve according to gender and age are. The sample was 10,368 fitness center customers (5864 women and 4504 men). After the IPMA, it was concluded that the main improvement margins in general in fitness centers were the equipment and the facility condition, and the facility layout. In turn, in relation to gender and age, the aspects with room for improvement were to a greater extent for equipment and facility condition in women over 21 years of age, and in facility layout for women between 21 and 40 years old and 51-60 years old. Regarding men, the aspects with the highest performance margins were the equipment and facility condition in all the age groups, the facility layout in men up to 50 years old, and the signage in men up to 40 years old and from 51 to 60 years old.

Associations of Objectively-Assessed Smartphone Use with Physical Activity, Sedentary Behavior, Mood, and Sleep Quality in Young Adults: A Cross-Sectional Study.

This study assesses the associations of objectively-measured smartphone time with physical activity, sedentary behavior, mood, and sleep patterns among young adults by collecting real-time data of the smartphone screen-state. The sample consisted of 306 college-aged students (mean age ± SD: 20.7 ± 1.4 years; 60% males). Over seven days of time, the following variables were measured in the participants: objectively-measured smartphone use (Your Hour and Screen Time applications), objective and subjective physical activity (GoogleFit and Apple Health applications, and the International Physical Activity Questionnaire (IPAQ), respectively), the number of hours sitting (IPAQ), mood (The Profile of Mood State (POMS)), and sleep (The Pittsburgh Sleep Quality Index (PSQI)). Multiple regressions analyses showed that the number of hours sitting per day, physical activity, and the POMS Global Score significantly predicted smartphone use (adj.R2 = 0.15). Further, participants with low levels of physical activity were more likely to increase the use of smartphones (OR = 2.981). Moreover, mood state (ß = 0.185; 95% CI = 0.05, 0.32) and sleep quality (ß = 0.076; 95% CI = -0.06, 0.21) predicted smartphone use, with those reporting poor quality of sleep (PSQI index >5) being more likely to use the smartphone (OR = 2.679). In conclusion, there is an association between objectively-measured smartphone use and physical activity, sedentary behavior, mood, and sleep patterns. Those participants with low levels of physical activity, high levels of sedentary behavior, poor mood state, and poor sleep quality were more likely to spend more time using their smartphones.

Evaluation and Behavior of Spanish Bodybuilders: Doping and Sports Supplements.

The use of doping agents has these days become a public health problem, as it also affects young and non-competitive amateurs in different sports. To prepare for competition, bodybuilders perform aggressive dietary protocols, so, bodybuilders frequently consume nutritional supplements (NS) and banned substances in large dosages. Thus, the aim of this study is to analyze the prevalence of banned substances consumption and NS intake in competitive level bodybuilders. A total of 48 bodybuilders (44 males and 4 females) completed a validated online questionnaire on NS consumption. The quantitative data was presented as a mean (M) ± standard deviation (SD), as well as having minimum and maximum values. The categorical variables were expressed using frequencies and percentages. 83.3% of the participants declared that they had consumed or would consume banned substances, the most consumed being anabolic steroids (72.9%). One hundred percent of those sampled use NS. Whey protein (96%), branched-chain amino acids (BCAA) (94%), creatine (85%) and vitamin complexes (83%) were the most consumed, however, there is a low consumption of certain NS which could also increase athletic performance.

Effects of an Acute Exercise Bout on Serum Hepcidin Levels.

Iron deficiency is a frequent and multifactorial disorder in the career of athletes, particularly in females. Exercise-induced disturbances in iron homeostasis produce deleterious effects on performance and adaptation to training; thus, the identification of strategies that restore or maintain iron homeostasis in athletes is required. Hepcidin is a liver-derived hormone that degrades the ferroportin transport channel, thus reducing the ability of macrophages to recycle damaged iron, and decreasing iron availability. Although it has been suggested that the circulating fraction of hepcidin increases during early post-exercise recovery (~3 h), it remains unknown how an acute exercise bout may modify the circulating expression of hepcidin. Therefore, the current review aims to determine the post-exercise expression of serum hepcidin in response to a single session of exercise. The review was carried out in the Dialnet, Elsevier, Medline, Pubmed, Scielo and SPORTDiscus databases, using hepcidin (and "exercise" or "sport" or "physical activity") as a strategy of search. A total of 19 articles were included in the review after the application of the inclusion/exclusion criteria. This search found that a single session of endurance exercise (intervallic or continuous) at moderate or vigorous intensity (60-90% VO2peak) stimulates an increase in the circulating levels of hepcidin between 0 h and 6 h after the end of the exercise bout, peaking at ~3 h post-exercise. The magnitude of the response of hepcidin to exercise seems to be dependent on the pre-exercise status of iron (ferritin) and inflammation (IL-6). Moreover, oxygen disturbances and the activation of a hypoxia-induced factor during or after exercise may stimulate a reduction of hepcidin expression. Meanwhile, cranberry flavonoids supplementation promotes an anti-oxidant effect that may facilitate the post-exercise expression of hepcidin. Further studies are required to explore the effect of resistance exercise on hepcidin expression.

Consumo de suplementos nutricionales y sustancias nocivas en culturismo: implicaciones para su gestión / Use of nutritional supplements and harmful substances in bodybuilding: implications for its management

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La calidad y la fidelidad del cliente: Un análisis de segmentación en centros de fitness low-cost / Quality and customer loyalty: A segmentation analysis in low-cost fitness center

La calidad y la fidelidad han sido estudiadas en los centros de fitness, mayormente en la relación que tienen entre ambas y con otras variables. En pocos casos se han realizado estudios que analicen los perfiles de clientes que mejor perciben dichas variables. Por esta razón el estudio tenía por objetivo segmentar a los clientes de centros de fitness low-cost según la percepción de calidad y fidelidad. La muestra estuvo compuesta por 8462 clientes (4303 mujeres y 4159 hombres) de centros de fitness low-cost. Se realizó análisis de la varianza y de conglomerados bietápico. Los resultados mostraron cuatro clústers en los que existieron diferencias significativas en la percepción de la calidad y la fidelidad. Estos hallazgos muestran la importancia del conocimiento de las características de consumidores deportivos (AU)

Quality and loyalty have been studied in fitness centers, mainly in the relationship between them and with other variables. In a few cases, studies have been carried out to analyze the profiles of clients who perceived these variables better. For this reason the study aimed to segment customers of low-cost fitness centers according to the perception of quality and loyalty. The sample consisted of 8462 clients (4303 women and 4159 men) from low-cost fitness centers. Analysis of variance and two - stage clustering were performed. The results showed four clusters in which there were significant differences in the perception of quality and loyalty. These findings show the importance of knowledge of the characteristics of sports consumers (AU)

Evaluación de los factores motivacionales en la práctica del Pole Sport: validación preliminar / Evaluation of motivational factors in the practice of Pole Sport: preliminary validation

El presente trabajo se propone dar respuesta a los principales motivos que llevan a los deportistas a practicar Pole Sport con el objetivo de mejorar la gestión de los centros deportivos donde se practica el mismo. Se utilizó como herramienta la Escala de Medida de los Motivos para la Actividad Física-Revisada (MPAM-R) de Celis-Merchán (2006), que mide los motivos de práctica deportiva en cinco dimensiones y consta de 30 ítems (Likert 1 al 7). Mediante la plataforma on-line Survio se difundió el cuestionario a los participantes procedentes de una academia que opera a nivel regional en la Comunidad de Andalucía, obteniéndose respuesta de 85 usuarios de los que 80 fueron mujeres y 5 hombres. Se empleó el software estadístico SPSS 22.0 para el análisis descriptivo de los datos, el análisis factorial exploratorio y de fiabilidad. Los resultados obtenidos mostraron que el «disfrute» es el principal factor motivacional para la práctica de Pole Sport, obteniendo una pertinencia adecuada del análisis factorial, así como una estructura claramente definida (AU)

The present work aims to respond to the main reasons that lead athletes to Pole Sport practice with the objective of improving the management of sports centers where it is practiced. In order to respond to the research problem, the Scale of Measurement of Reasons for Physical Activity-Revised (MPAM-R) by Celis-Merchán (2006) was used. This scale has 30 items (Likert 1 to 7) and measures the reasons of sports practice in five dimensions. Through the Survio online software, the questionnaire was distributed to 85 athletes, of whom 80 were women and five men. For the descriptive analysis of the data, exploratory factorial, and reliability, the statistical program SPSS 22.0 was used. The results obtained showed that the «enjoyment» was the main motivational factor for the practice of Pole Sport, which agree with the results obtained by Frederick and Schuster (2003) (AU)

Cultura organizacional y satisfacción laboral: Propiedades psicométricas de una escala en centros de fitness / Organization culture and job satisfaction: psychometric properties of scale in fitness centers

Numerosos estudios indican la relación significativa entre la cultura organizacional y la satisfacción en el trabajo. Por lo que las organizaciones con culturas organizativas adecuadas obtendrán ventajas competitivas. Por esta razón, destacar que se trata de una variable vital, especialmente en la búsqueda de satisfacción laboral del cliente interno en los centros deportivos. El objetivo de este estudio fue trabajar con un modelo de medida entre la cultura organizacional y la satisfacción laboral en centros de fitness. Se empleó el Culture Index for Fitness Organizations (CIFO) para la cultura organizacional y el Overall Job Satisfaction para la satisfacción laboral, evaluando las propiedades psicométricas a través de un análisis factorial exploratorio y confirmatorio. Para evaluar la fiabilidad y validez del modelo, se analizó la fiabilidad compuesta, la varianza media extractada, la validez convergente y discriminante. La muestra estuvo compuesta por 180 empleados (79 mujeres y 101 hombres) de centros de fitness. Los resultados muestran que el modelo de cultura organizacional y satisfacción laboral es adecuado, ofreciendo un ajuste satisfactorio tras la obtención de una estructura factorial bien definida. Por tanto, la escala utilizada cuenta con adecuadas propiedades psicométricas, permitiendo una evaluación fiable y válida de la cultura organizacional y la satisfacción laboral (AU)

Numerous studies indicate the significant relationship between organizational culture and job satisfaction. So organizations with appropriate organizational cultures gain competitive advantages. For this reason, it should be noted that this is a vital variable, especially in the search for job satisfaction of the internal customer in sports centers. The objective of this study was to work with a test model between organizational culture and job satisfaction in fitness centers. The Culture Index for Fitness Organizations (CIFO) was used for organizational culture and Overall Job Satisfaction for job satisfaction, evaluating the psychometric properties through an exploratory and confirmatory factor analysis. To evaluate the reliability and validity of the model, we analyzed the composite reliability, the average variance extracted, and the convergent and discriminant validity. The sample consisted of 180 employees (79 women and 101 men) from fitness centers. The results showed that the organizational culture and job satisfaction model is adequate, offering an adequate goodness-of-fit after obtaining a well-defined factor structure. Therefore, the scale used has adequate psychometric properties, allowing a reliable and valid assessment of organizational culture and job satisfaction (AU)

Impacto de la crisis económica en la rentabilidad de las empresas de gestión de instalaciones de ocio deportivo según tamaño, un estudio empírico / Impact of economic crisis on porfitability management business leisure sports facilities by size, an empirical study

El aumento de la práctica deportiva en la sociedad Española ha impulsado el crecimiento del volumen de negocio y número empresas de gestión de instalaciones deportivas. El citado crecimiento, se juzga claramente a partir del análisis de los ratios económicos financieros como es la rentabilidad económica media, y estos se ven en mayor o menor medida afectados por un entorno cambiante de crisis económica, según el tamaño de la organización. El objetivo de esta investigación fue el análisis el efecto en evolución de rentabilidad económica media, de las Organizaciones de Gestión de Instalaciones Deportivas Españolas antes y después de la crisis según su tamaño (micro, pequeña, mediana y grande). Para el análisis del presente estudio, se obtuvo la información contable y financiera de la bases de datos SABI de 1.670 empresas, registradas en el CNAE bajo el código 9311 entre los años 2004-2012, de las que se seleccionó una muestra de 319. Según los hallazgos, podemos afirmar que la crisis económica ha afectado a la rentabilidad económica de Organizaciones de Gestión de Instalaciones Deportivas Españolas de forma diferente según tamaño de las mismas, se constata que las organizaciones medianas son las mas eficientes en el uso de sus recursos económicos o en la obtención de beneficios de sus activos, en términos de valores medios de rentabilidad económica. Sin embargo, que las grandes, pequeñas y microempresas OGIDE, muestran valores medios de rentabilidad económica inferiores a los obtenidos anteriormente a la crisis económicas de 2008

Increasing the sport in the Spanish society has fueled the growth of turnover and number management companies sports facilities. Said growth is clearly judged from the economic analysis of financial ratios such as average profitability, and these are to a greater or lesser extent affected by a changing environment of economic crisis, according to the size of the organization. The objective of this research was to analyze the effect on evolution of average economic profitability of Management Organizations Sports Spanish before and after the crisis by size (micro, small, medium and large). For the analysis of this study, the accounting and financial information from the SABI data base of 1,670 companies registered under code 9311 NCEA between 2004-2012, of which a sample of 319 was selected was obtained According the findings, we can say that the economic crisis has affected the profitability of Management organizations Spanish sports differently depending on their size, it is found that midsize organizations are the most efficient in the use of their economic resources or in the profit of its assets, in terms of average values of economic profitability. However, that large, small and micro OGIDE show average values of lower economic returns to those obtained prior to the economic crisis of 2008