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Nikki Rommers Mireille Mostaert Lennert Goossens Roel Vaeyens Erik Witvrouw Matthieu Lenoir 《Journal of sports sciences》2019,37(2):196-203
This study investigated differences in generic and soccer specific motor coordination, as well as speed and agility depending on age and maturity in elite youth soccer players (U10-U15, N = 619). Measurements included body height, body weight and sitting height to estimate age at peak height velocity (APHV); three Körperkoordinationstest für Kinder subtests (i.e. jumping sideways (JS), moving sideways (MS), balancing backwards (BB)) to assess generic motor coordination; the UGent dribbling test for soccer specific motor coordination; a 5m/30m sprint and T-test for speed and agility, respectively. Age specific z-scores of the predicted APHV identified players as earlier, on time or later maturing. (M)ANOVA analyses showed significant age by maturity interaction effects for the speed and agility test cluster, revealing maturity related differences in U14 and U15 players. Next to an overall higher performance with age for all test clusters (η2 0.080–0.468), earlier maturing players outperformed their later maturing peers in 5m/30m sprinting. The opposite was seen for JS and BB. So, players’ maturity status should be taken into account to adequately value performance in talent identification. Also, the focus on characteristics that appear to be minimally biased by an earlier maturational timing (i.e. motor coordination) should be increased. 相似文献
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Although the issue of method bias is a well-known threat to the validity of self-reports, it has seldom been addressed in empirical media effects studies. This may be problematic because independent and dependent variables are often measured using similar methods. Thus, reported correlations may not only reflect common variance between the constructs of interest but also indicate common variance between the measurement methods. In this article, we present two cultivation studies investigating to what extent first-order cultivation relationships are influenced by common method variance. In both studies, controlling for a theoretically unrelated marker variable (Study 1: the estimated prevalence of bakers; Study 2: the estimated prevalence of bricklayers) diminished correlations between television-viewing frequency and prevalence estimates. This finding, referred to as the bricklayer effect, suggests a more thorough discussion on common method variance in cultivation research is needed. 相似文献
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Dominique Hansen Jan-Willem van Dijk Antoine Zorenc Lennert Minten Kevin Smeets 《European Journal of Sport Science》2018,18(9):1245-1254
Aims: Exercise combined with adipose tissue lipolytic inhibition augments intramuscular lipid and glycogen use in type 2 diabetes patients. The present study investigates the impact of adipose tissue lipolytic inhibition during exercise on subsequent postprandial glycemic control in type 2 diabetes patients.Methods: Fourteen male type 2 diabetes patients (age 65?±?2 years, HbA1c 6.7?±?0.1% (50?±?2?mmol/mol)) participated in a double-blind placebo-controlled randomized cross-over study in which subjects performed endurance-type exercise after being administered 250?mg of a nicotinic acid analogue (acipimox; ACP) or a placebo (PLA). A control experiment was included in which no exercise was performed (CON).Results: Sixty minutes of endurance-type exercise (at 45% Wpeak) did not significantly lower circulating plasma glucose and insulin excursions in PLA when compared with CON (P?=?.300). Acipimox administration strongly reduced circulating plasma FFA concentrations during exercise (P?i.e. postprandial) in ACP when compared with either CON (P?=?.041 and P?=?.002, respectively) or PLA (P?=?.009 and P?=?.001, respectively).Conclusions: Collectively, exercise with adipose tissue lipolytic inhibition reduces postprandial blood glucose and insulin excursions and, as such, further improves glycemic control in male type 2 diabetes patients. 相似文献
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Sien Vercruysse Leen Haerens Evert Verhagen Lennert Goossens Dirk De Clercq 《European Journal of Sport Science》2016,16(7):868-876
Physical education (PE) teachers are at a high risk of musculoskeletal sports or work-related injuries because of the physical activity as inherent part of their profession. Such injuries have a negative impact on work and leisure time activities, and effective injury prevention interventions are needed. The present study aimed at testing the effectiveness of an injury prevention intervention that was developed and optimized according to PE teachers' wishes and values. Fifty-five PE teachers were randomly assigned to intervention or control group. Intervention group teachers engaged in two days of training during which they familiarized with eight injury prevention strategies (seven intrinsic and one extrinsic). A special feature of the intervention was that the way of delivery was based on the self-determination theory in order to stimulate participants' motivation to adhere to the proposed strategies. Prospective registrations during one school year were conducted concerning injuries and preventive behaviours. Results showed that the intervention group teachers had a lower number of injuries per 1000?h time of exposure (TOE) than the controls (INT: 0.49, CON: 1.14 injuries/1000?h TOE, OR: 2.32, 95% CI: 1.06–5.07), and applied a broader variety of strategies including dynamic and static stretching, core stability, balance and strength training, when compared to the controls who mainly engaged in warming-up. In conclusion, with the same amount of time, an injury reduction was found in PE teachers through a more balanced use of provided preventive strategies. 相似文献
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Sien Vercruysse Dirk De Clercq Lennert Goossens Nathalie Aelterman Leen Haerens 《Physical Education & Sport Pedagogy》2017,22(2):171-186
Background: Injury prevention is highly needed in physically active populations, such as pre-service and in-service physical education teachers (PETs). As a lack of adherence to preventive strategies is problematic in injury, it seems crucial to develop and optimize interventions that correspond to the specific needs and wishes of PETs.Aim: The purpose of the present study was fourfold. Specifically, we aimed at (1) systematically optimizing an injury prevention intervention for PETs, based on teachers’ qualitative evaluation of the intervention, (2) quantitatively investigating whether the appreciation of the injury prevention intervention was higher after optimization, (3) examining whether participation in the intervention resulted in positive changes in teachers’ perceived utility of, and confidence to apply the proposed preventive strategies, as well as their knowledge about these strategies, and (4) describing teachers’ adherence to the proposed preventive strategies while they were engaging in the intervention.Participants: Twenty PETs (13 men, Mage = 42.1 ± 12.17 years) from nine different secondary schools in Flanders (Belgium) voluntarily participated in this study. The intervention, based on findings from the continuing professional development (CPD) literature, and the principles of the self-determination theory, took place on two different training days (Training A and Training B) and consisted of seven intrinsic injury prevention strategies.Data collection and analysis: Qualitative data on teachers’ appreciation of the intervention were collected by means of focus group interviews, which were used to optimize the intervention (Aim 1). Quantitative data on teachers’ appreciation were collected directly after they had engaged in the intervention and were used to compare the appreciation from the initial to more optimized versions of the trainings (Aim 2). Further, by means of repeated measures ANOVAs positive evolutions in teachers’ belief in the utility of, confidence to apply and knowledge about the provided strategies across time were examined (Aim 3). Finally, teachers’ adherence was evaluated by relying on weekly online registrations of minutes and types of preventive strategies teachers had practised during the past week (Aim 4).Findings: Despite the relatively high initial appreciation scores (4.2 out of 5), the optimized versions of the trainings scored better on interaction, intelligibility, innovation, practical usefulness, and recommendation (Aims 1 and 2). Significant differences were found over time in terms of within-teacher changes in perceived utility of (4.05–4.73–4.48; p?p?p?Conclusions: The present study developed an intervention that optimally fulfils the wishes and needs of the target population, namely PETs, and can readily be implemented in PET education programmes or CPD programmes for in-service PETs. Results of this pilot study are promising because teachers displayed increases in several relevant outcomes. Various suggestions are formulated on how to increase PETs’ appreciation of CPD programmes. 相似文献
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Lennert Goossens Sien Vercruysse Greet Cardon Leen Haerens Erik Witvrouw Dirk De Clercq 《Journal of sports sciences》2016,34(12):1107-1115
Physical education (PE) teachers have a physically demanding job, putting them at a considerable risk for musculoskeletal injuries. To structurally develop tailored injury prevention programmes for PE teachers, a clear understanding of the extent, characteristics and underlying factors of their musculoskeletal injuries compared to referents is necessary. Therefore, the current study prospectively followed 103 PE teachers and 58 non-PE teachers, who registered musculoskeletal injuries and time of exposure to sports participation during one school year. Pearson χ2-tests and independent samples t-tests determined significant differences between PE and non-PE teachers regarding demographics and variables possibly related to injury occurrence. PE teachers had 1.23 and non-PE teachers 0.78 injuries/teacher/school year. This difference was significantly different after adjustment for hours spent weekly on intracurricular teaching during the career and for injury history during the preceding six months (P = 0.009; OR = 0.511; 95% CI = 0.308–0.846). PE teachers’ most affected body parts were the knee and the back. PE teachers had a more extensive injury history (P < 0.001), a higher work- (P < 0.001) and sport index (P < 0.001), practiced more sports (P < 0.002) and taught more extracurricular sports (P = 0.001). Future injury prevention programmes should take account for the great injury history and heavy physical load in PE teachers. 相似文献
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