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Cemal Ozemek Mitchell H. Whaley W. Holmes Finch Leonard A. Kaminsky 《European Journal of Sport Science》2017,17(5):563-570
There have been many conflicting observations between the linear or curvilinear decline in maximal heart rate (HRmax) with age. The aim of this study was to determine if linear or curvilinear equations would better describe the decline in HRmax with age in individuals of differing cardiorespiratory fitness (CRF) levels. Treadmill cardiopulmonary exercise test (CPX) results from participants (1510 men and 1134 women; 18–76 years) free of overt cardiovascular disease were retrospectively examined using cross-sectional and longitudinal study designs. Participants completing ≥2 CPX with ≥1 year between test dates were included in the longitudinal analysis (325 men and 150 women). Linear and quadratic regressions were applied to age and HRmax for the whole cohort and respective CRF groups (high, moderate, and low, relative to age and gender normative values). To test for differences among linear, quadratic, and polynomial equations, the change in R2 (cross-sectional analysis) and Bayesian information criterion (BIC) (longitudinal analysis) from the linear to the more complex models were calculated. The quadratic or polynomial regression in the cross-sectional analysis, marginally improved the variance in HRmax explained by age compared to the linear regression for the whole cohort (0.2%), moderate fit group (0.3%), and low fit group (0.8%). With no improvements in the high fit group. BIC did not improve for any CRF category in the longitudinal analysis. In conclusion, the minimal differences among linear, quadratic, and polynomial equations in the respective CRF groups, emphasizes the use of linear prediction equations to estimate HRmax. 相似文献
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Richard C. Thelwell Christopher R. D. Wagstaff Adam Rayner Michael Chapman Jamie Barker 《Journal of sports sciences》2017,35(1):44-55
The present study aimed to extend research that has focused on the identification of stressors associated with coaching practice by systematically evaluating how such stressors effect athletes, and more broadly, the coach–athlete relationship. A total of 13 professional- and national-level athletes were interviewed to address the three study aims: how they detect when a coach is encountering stressors, how coach experiences of stress effects them as an athlete, and how effective the coach is when experiencing stress. Following content analysis, the data suggested athletes were able to detect when a coach was experiencing stress and this was typically via a variety of verbal and behavioural cues. Despite some positive effects of the coach experiencing stress, the majority were negative and varied across a range of personal influences on the athlete, and effects on the general coaching environment. It was also the broad view of the athletes that coaches were less effective when stressed, and this was reflected in performance expectations, perceptions of competence, and lack of awareness. The findings are discussed in relation to the existing theory and with reference to their implications for applied practice, future research, and development of the coach–athlete relationship. 相似文献
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Jamie Morgan 《Metascience》2013,22(1):111-113
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Jonathan P. Norris Jamie Highton Stephen F. Hughes Craig Twist 《Journal of sports sciences》2016,34(19):1859-1866
The aim of this study was to investigate how the type of contact influences physiological, perceptual and locomotive load during a simulated rugby league match. Eleven male university rugby league players performed two trials of the rugby league movement simulation protocol for interchange forwards with a traditional soft tackle bag and a weighted tackle sled to replicate contact demands. The interchange forward-specific simulation was chosen given the contact frequency is higher for this group of players compared to whole match players. Locomotive rate, sprint speed, tackle intensity, heart rate (HR) and rating of perceived exertion were analysed during the first and second bouts that replicated two ~23 min on-field passages. Countermovement jump (CMJ) was measured before and immediately after each trial. More time was spent in heart rate zone between 91 and 100% HRpeak during the first (effect size ± 90% confidence interval: 0.44 ± 0.49) and second bouts (0.44 ± 0.43), and larger (0.6 ± 0.69) decrements in CMJ performance were observed during the sled trial (5.9, s = 4.9%) compared to the bag trial (2.6, s = 5.4%). Changing the type of contact during the match simulation subtly altered both the internal and external loads on participants. Using a standard tackle bag results in faster sprint speed to contact, but lower overall high-intensity running. Conversely, a heavier tackle object increases the internal load and results in greater lower limb neuromuscular fatigue as reflected by the decrease in CMJ performance. 相似文献
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Meaghan C. Guiney Jamie Zibulsky 《Journal of educational and psychological consultation》2017,27(1):52-71
ABSTRACTUsing samples of novice and advanced consultants in training (CITs), this study explored the development of consultation self-efficacy (CSE) for both process-oriented and problem-oriented aspects of consultation. Regardless of experience level, self-efficacy in both domains increased with training. However, significantly greater gains were made by novice CITs as compared to their advanced counterparts. In addition, feedback collected from consultees was generally favorable, and consultants received high ratings on items that reflected both process- and problem-focused skills. Implications for consultation training are discussed. 相似文献
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Jamie Zibulsky Christine Casbar Tamar Blanchard Chelsea Morgan 《Psychology in the schools》2019,56(2):206-219
This study was designed to examine whether participation in a shared reading workshop alters the frequency with which parents ask their children questions during book reading sessions, particularly questions designed to strengthen component reading skills that they may not have known about before training. Participants in the reading workshop series (N = 57) were taught strategies for asking questions about story content and word structure to build children's language and literacy skills. Findings suggest that parents may be somewhat familiar with traditional dialogic reading strategies focused on story content and utilize them without instruction, whereas parents may be less knowledgeable about sound or print‐focused skills and do not employ strategies focused on word structure until instructed to do so. It is also notable that parents do not use all story content prompts equally. This information can be used by school psychologists to refine the messages educators share with parents about how to best support their children's reading development. 相似文献
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