Nektarios A. Stavrou

The effect of treadmill training on gross motor function and walking speed in ambulatory adolescents with cerebral palsy: a randomized controlled trial.

ObjectiveThe aim of this study was to evaluate the effect of a treadmill program on gross motor function, walking speed, and spasticity of ambulatory adolescents with spastic cerebral palsy (diplegia and tetraplegia). DesignIn this randomized controlled trial, 22 adolescents (13–19 yrs old) from a special school for children with physical disabilities were randomly allocated to the experimental and control training groups. The experimental training group underwent a treadmill program without body weight support at a comfortable speed. The control group received treatment with conventional physiotherapy, which consisted of three sets of exercises with mat activities, balance, gait training, and functional gross motor activities. The program lasted 12 wks with a frequency of three times per week for both groups. Pretest and posttest measurements of self-selected walking speed, gross motor function, and spasticity were conducted. ResultsThe analysis of covariance findings examining posttest differences between groups were significant with respect to self-selected walking speed (F = 8.545, P = 0.000) and gross motor function (F = 9.088, P = 0.007), whereas no significance was found for spasticity. ConclusionsTreadmill training may improve the walking speed and gross motor function of adolescents with spastic cerebral palsy, without adverse effects on spasticity.

Development and Validation of the Self-Talk Questionnaire (S-TQ) for Sports

The purpose of the present study was to describe the development and validation of the Self-Talk Questionnaire (S-TQ), designed to measure two functions of self-talk strategies, namely the motivational function and the cognitive function, used by athletes to enhance their sport performances. The study was conducted in three phases. The first phase targeted item selection and content relevance. The second phase set out to test the factor structure of the instrument. The aim of the third phase was focused on further examination of the psychometric properties of the instrument. The results of an exploratory factor analysis provided adequate support for the instrument. The S-TQ consists of 11 items, representing two factors (motivational and cognitive). A confirmatory factor analysis showed an acceptable fit to the data. The factors were internally consistent, the correlations with external criteria were significant, and test-retest reliability values were very good. Examining the relationships between the S-TQ and similar constructs supported convergent validity. Discriminant validity was supported by correlations between the S-TQ and a different construct. The S-TQ appears to be a promising psychometric instrument that can be used in research and psychological intervention programs.

The Effect of Physiotherapy-Based Breathing Retraining on Asthma Control

Background. The mechanism of the breathing retraining effect on asthma control is not adequately based on evidence. Objective. The present study was designed to evaluate the effect of physiotherapy-based breathing retraining on asthma control and on asthma physiological indices across time. Study design. A 6-month controlled study was conducted. Adult patients with stable, mild to moderate asthma (n = 40), under the same specialist’s care, were randomized either to be trained as one group receiving 12 individual breathing retraining sessions (n = 20), or to have usual asthma care (n = 20). The main outcome was the Asthma Control Test score, with secondary outcomes the end-tidal carbon dioxide, respiratory rate, spirometry, and the scores of Nijmegen Hyperventilation Questionnaire, Medical Research Council scale, and SF-36v2 quality-of-life questionnaire. Results. The 2 × 4 ANOVA showed significant interaction between intervention and time in asthma control (F = 9.03, p < .001, η2 = 0.19), end-tidal carbon dioxide (p < .001), respiratory rate (p < .001), symptoms of hypocapnia (p = .001), FEV1% predicted (p = .022), and breathlessness disability (p = .023). The 2 × 4 MANOVA showed significant interaction between intervention and time, with respect to the two components of the SF-36v2 (p < .001). Conclusion. Breathing retraining resulted in improvement not only in asthma control but in physiological indices across time as well. Further studies are needed to confirm the benefits of this training in order to help patients with stable asthma achieve the control of their disease.

Confirmatory factor analysis of the flow state scale in sports

Abstract The present investigation was designed to assess the psychometric properties of the Flow State Scale (FSS) in sports using confirmatory factor analysis. It is a self‐report instrument consisting of 36 items measuring nine different factors. A series of three studies were conducted, using a total of 1083 athletes, men and women, from ten individual sports. The aim of the first study was to translate the FSS into Greek following the back‐translation procedure. The aim of the second study was to test the nine first‐order factor model according to the original structure (Jackson & Marsh, 1996). The results of this second study indicated an acceptable fit to the model. Correlations among the FSS and similar validated instruments were performed, providing further support to the factor structure of the FSS, through construct validity. The purpose of the third study was to test four alternative measurement models through confirmatory factor analysis, a nine first‐order factor model, and three hierarchical models positing one or three second‐order factors. The results of the third study indicated an acceptable fit for the nine first‐order factor model, as well as for the third hierarchical model, whereas the single hierarchical model provided a poor fit. Overall, the present investigation supported the multidimensional nine first‐order factor of the FSS in sports.

Motivation for weight-loss diets: A clustering, longitudinal field study using self-esteem and self-determination theory perspectives

Background Gradual elevation of body weight leads numerous individuals to dieting and weight loss behaviours. Nevertheless, the prevalence of obesity continues to rise in industrialised countries. The examination of the motivational determinants of dietary modification (‘dieting’) in order to identify clusters of individuals in the first 6 months of their effort to control body weight was the aim of the current study. The theories of self-determination and self-esteem formation guided our analysis. Methods A longitudinal study was conducted with three data collection points (N1=256; N2=135; N3=75). Data were responses on the Treatment Self Regulation Questionnaire, Social Physique Anxiety Scale, Physical Self-Description Questionnaire, Kaiser Physical Activity Survey Questionnaire, and items assessing expectations of achievement and self-confidence. Results Cluster analyses provided stable and validated cluster profiles for all data sets. In the 1st and 2nd data sets, results revealed three groups of dieters labelled as ‘media victims’, ‘try to feel nice’ and ‘older and experienced’. For the 3rd data set, results supported a 4-group solution (‘less adaptive profile’, ‘second successful dieters’, ‘successful dieters’, and ‘unsuccessful dieters’). The need for autonomous versus controlling dieting reasons based on Self-Determination Theory, along with the need for an alternative paradigm in weight management, are proposed. Conclusions Psychological theories of self-determination and self-esteem provide important ways of understanding and identifying adaptive and less adaptive weight control strategies.

Use of the Sport Orientation Questionnaire with Wheelchair Athletes: Examination of Evidence for Validity

The factor structure of the Sport Orientation Questionnaire with three factors of competitiveness, win orientation, and goal orientation was examined in a sample of 243 wheelchair athletes from the USA. Based on sample-specific validity evidence theory, it was hypothesized that the exploratory and confirmatory factor analyses would yield evidence on validity for wheelchair athletes who were different from able-bodied athletes. Exploratory factor analysis confirmed the hypothesis with a clear fourth and a questionable fifth factor. A confirmatory factor analysis did not adequately explain the new five-factor model. The new emerging fourth and fifth factors separated the competitiveness element of the questionnaire in ‘self-referenced’ and ‘other-referenced’ elements of competitiveness. Results are discussed in terms of demographic characteristics of the sample of wheelchair athletes.

Psychological strain: Examining the effect of hypoxic bedrest and confinement

The aim was to assess the effect of a 10-day exposure to the environmental stressors anticipated in future lunar habitats on indices of psychological strain. In addition to the reduced gravity of the Moon, future habitats on the Moon will likely maintain a hypobaric hypoxic environment. The hypobaric environment will eliminate the need for long decompression profiles prior to each extra-vehicular activity. We investigated the indices of psychological strain during three 10-day conditions, designed to assess the separate and combined effects of inactivity/unloading and normobaric hypoxia on several physiological systems. Eleven male participants underwent three 10-day campaigns in a randomised manner: 1) normobaric normoxic bed rest (NBR), 2) normobaric hypoxic bed rest (HBR) and 3) normobaric hypoxic ambulatory confinement (HAMB). The most negative psychological profile appeared on day 10 of the HBR and HAMB (hypoxic) conditions. Concomitantly, a decrease in positive emotions was observed from baseline to day 10 of the HBR and NBR conditions. Thus, confinement in a hypoxic environment seems to exert a negative effect on an individuals psychological mood.

Sport Orientation Model for Wheelchair Basketball Athletes

This study examined the validity of the Sport Orientation Questionnaire (Competitiveness: 13 items, Win Orientation: 6 items, and Goal Orientation: 6 items) in a sample of 195 wheelchair basketball athletes from the USA. Following evidence for sample-specific validity, the measurement model that underlies the questionnaire was examined. A short-form with 15 items for three factors of Competitiveness (7 items), Win Orientation (5 items) and Goal Orientation (3 items) fit the data (χ2/ df ratio = 2.21, NNFI = .892, CFI = .991, RCFI = .935, SRMR = .058, RMSEA = .071). To evaluate the findings further, we cross-validated the short-form by sex. Structural equation modeling indicated there were similar measurement properties and factor structures for the men and women, indicating similar conceptualization of sport orientations. Meaningful comparisons across sex may be undertaken, since both men and women who are wheelchair basketball athletes perceive the three short-form SOQ factors similarly.

Flow theory - goal orientation theory: positive experience is related to athlete's goal orientation.

The main purpose of this study was to examine the relationship between flow experience and goal orientation theory, as well as, the differences in flow experience based on the orthogonal model of goal orientation theory. Two hundred and seventy eight athletes completed the Task and Ego Orientation Sport Questionnaire based on how they usually feel. The challenge and skills ratings were completed 1 h before the competition, based on how they felt at the exact time of answering. In the following, the Flow State Scale-2 was completed up to 30 min after the competition they just participated, along with the challenge-skill ratings, based on how athletes felt during the competition. The results indicated that the athletes’ task orientation may be an important factor for attaining flow in competitive sport, feeling more skillful and estimating the upcoming competition as challenging, while low ego and low task oriented athletes lack these elements, which are important for them to get into flow. Additionally, not the level of task and ego orientation per se, but the balance between athletes’ goal orientation preferences seems important for the formation of flow experience, indicating that high task – high ego and high task – low ego athletes are experiencing the most positive mental state.

Neighborhood environment, physical activity, and quality of life in adults: Intermediary effects of personal and psychosocial factors

Background Studies have indicated that there is a positive and indirect relationship between physical activity (PA) and quality of life (QoL). The current study examined this relationship through a social cognitive model with consideration to the intermediary effects of exercise self-efficacy, and physical (PCS, physical component summary) and psychological (MCS, mental component summary) health. Additionally, this model was widened to include concepts from the ecological theory, and any causal associations among neighborhood environment, PA, and QoL. Methods Six hundred and eighty-four physically active adults (39.16 ± 13.52 years, mean ± SD), living in Athens, Greece, completed a series of questionnaires measuring PA, QoL, exercise self-efficacy, PCS, MCS, neighborhood environment, and family and friend support for PA. The examined models were analyzed using structural equation modeling. Results The social cognitive and ecological models proved to be of appropriate fit. Within the social cognitive model, PA positively affected QoL through the mediating effects of exercise self-efficacy, PCS, and MCS. With regards to the ecological model, neighborhood environment positively influenced QoL through the intermediary effects of family support for PA, exercise self-efficacy, PA, PCS, and MCS. Conclusion Results indicated that the most important mediators in the examined models were exercise self-efficacy and health. Further, findings demonstrated the role of neighborhood environment in enhancing PA and QoL. Future studies should be carried out applying longitudinal data for a better understanding of these associations over time.