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Craig A. Horswill

As a result of exercise-induced sweating, athletes and trained individuals can lose up to 3 L of fluid per hour. Fluid replacement is required to maintain hydration and allow the athlete to continue to perform. Inadequate fluid intake will adversely affect temperature regulation, cardiovascular function, and muscle metabolism. To maximize fluid intake and effectively replace fluid, athletes must employ behavioral strategies. Athletes can also select beverages with characteristics that complement their behavioral efforts. Palatability, rapid absorption, retention of the fluid, and ergogenicity are the major attributes to consider for enhancing hydration during training and physical activity.

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Bo Shen and Ang Chen

Guided by the Model of Domain Learning (MDL), the study was designed to explore the extent of interrelations among prior knowledge, learning strategies, interests, physical engagement, and learning outcomes in a sixth-grade (N = 91) volleyball unit. Pearson product-moment correlations and a path analysis were conducted for the research purpose. The results showed that students’ prior knowledge, learning strategies, and interests were interrelated. Physical engagement and learning outcomes were directly influenced by the interactions among prior knowledge, interests, and learning strategies. The findings in the study support that learning in physical education is domain-specific and a progressive process that encompasses both cognitive and affective components.

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Jack A. G. Marlow and Mark Uphill

This study explored the characteristics, contextual factors and consequences of counterfactual thoughts in seven elite athletes using interpretative phenomenological analysis (IPA). Counterfactuals were experienced regularly with self-directed and upward counterfactuals (cognitions about how things could be better) being most frequent. These upward counterfactuals typically occurred following performance that was below participants’ goals and expectations. These thoughts were perceived by participants to have a negative affect initially, and that they then led to facilitative behavioral consequences around learning and development. Some elements of counterfactual thinking could be used as a useful reflective tool to encourage elite athletes to problem solve and motivate cognitive, emotional and behavioral change to enhance future performance.

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Kathleen A. Martin, Sandra E. Moritz and Craig R. Hall

Research examining imagery use by athletes is reviewed within the context of an applied model for sport. The model conceptualizes the sport situation, the type of imagery used, and imagery ability as factors that influence how imagery use can affect an athlete. Three broad categories of imagery effects are examined: (a) skill and strategy learning and performance, (b) cognitive modification, and (c) arousal and anxiety regulation. Recommendations are offered for the operationalization and measurement of constructs within the model, and suggestions are provided for how the model may guide future research and application.

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Ron A. Thompson

While college women in general are at risk for anorexia nervosa and bulimia, these disorders may present more of a problem for the student-athlete due to her weight/body consciousness and the pressure associated with athletic competition at the college or university level. This paper discusses the physical and psychological characteristics of each disorder, their etiology, and how each affects the life and performance of the athlete. Recommendations are offered regarding the role of the sport management team (i.e., sport psychologist, team physician, coach, athletic trainer, exercise physiologist) in assisting the eating-disordered athlete.

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C. Craig Stewart

This study investigated the effects of four practica situations on the attitudes of undergraduate students toward disabled individuals. Students enrolled in two undergraduate adapted physical education classes were studied during two academic quarters. They had the option of being involved in one of four practica situations. The attitudes of the students were measured with the Attitude Toward Disabled Persons scale. Interpretation of the statistical analyses revealed that, as a group, the adapted physical education students’ attitudes improved over a 10-week period and that certain practica experiences tended to affect attitudes more than others.

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Kevin A. Jacobs, David R. Paul, Ray J. Geor, Kenneth W. Hinchcliff and W. Michael Sherman

The purpose of the current study was to examine the influence of dietary composition on short-term endurance training–induced adaptations of substrate partitioning and time trial exercise performance. Eight untrained males cycled for 90 min at ~54% aerobic capacity while being infused with [6,62H]glucose before and after two 10-d experimental phases separated by a 2-week washout period. Time trial performance was measured after the 90-min exercise trials before and after the 2nd experimental phase. During the first 10-d phase, subjects were randomly assigned to consume either a high carbohydrate or high fat diet while remaining inactive (CHO or FAT). During the second 10-d phase, subjects consumed the opposite diet, and both groups performed identical daily supervised endurance training (CHO+T or FAT+T). CHO and CHO+T did not affect exercise metabolism. FAT reduced glucose flux at the end of exercise, while FAT+T substantially increased whole body lipid oxidation during exercise and reduced glucose flux at the end of exercise. Despite these differences in adaptation of substrate use, training resulted in similar improvements in time trial performance for both groups. We conclude that (a) 10-d high fat diets result in substantial increases in whole body lipid oxidation during exercise when combined with daily aerobic training, and (b) diet does not affect short-term training-induced improvements in high-intensity time trial performance.

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Amy Warren, Erin J. Howden, Andrew D. Williams, James W. Fell and Nathan A. Johnson

Postexercise fat oxidation may be important for exercise prescription aimed at optimizing fat loss. The authors examined the effects of exercise intensity, duration, and modality on postexercise oxygen consumption (VO2) and substrate selection/respiratory-exchange ratio (RER) in healthy individuals. Three experiments (n = 7 for each) compared (a) short- (SD) vs. long-duration (LD) ergometer cycling exercise (30 min vs. 90 min) matched for intensity, (b) low- (LI) vs. high-intensity (HI) cycling (50% vs. 85% of VO2max) matched for energy expenditure, and (c) continuous (CON) vs. interval (INT) cycling matched for energy expenditure and mean intensity. All experiments were administered by crossover design. Altering exercise duration did not affect postexercise VO2 or RER kinetics (p > .05). However, RER was lower and fat oxidation was higher during the postexercise period in LD vs. SD (p < .05). HI vs. LI resulted in a significant increase in total postexercise energy expenditure and fat oxidation (p < .01). Altering exercise modality (CON vs. INT) did not affect postexercise VO2, RER, or fat oxidation (p > .05). These results demonstrate that postexercise energy expenditure and fat oxidation can be augmented by increasing exercise intensity, but these benefits cannot be exploited by undertaking interval exercise (1:2-min work:recovery ratio) when total energy expenditure, duration, and mean intensity remain unchanged. In spite of the apparent benefit of these strategies, the amount of fat oxidized after exercise may be inconsequential compared with that oxidized during the exercise bout.

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Flavia Meyer, Oded Bar-Or and Boguslaw Wilk

Twelve 9- to 12-year-old children performed four exercise-in-the-heat trials (35 C°, 45% RH), which differed in the fluids consumed. In each trial, subjects were kept euhydrated while cycling one 20-min and two 15-min bouts at 50% peak VO2 followed by a 90% peak VO2 bout until exhaustion. Thereafter, they could drink ab libitum while resting. One drink was water, and the other three drinks had 6% CHO with different Na+: 0, 8.8, and 18.5 mEq · L1. All drinks had the same grape flavor. The perceived thirst was similar among trials and it did not increase while subjects were exercising. On average, subjects felt their stomach “somewhat full” with no difference among drinks. Thermal sensations, RPE, and overall comfort were similar among trials. During a 30-min recovery, volume intake was similar among drinks (201 ± 27 ml). In conclusion, the drink composition did not affect perceptual responses to drinking while euhydrated children exercised in the heat, nor did it affect drinking behavior during recovery.

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William A. Braun, Michael G. Flynn, Daniel L. Carl, Kathy K. Carroll, Todd Brickman and Charlie P. Lambert

Iron deficiency may lead to anemia and may result in compromised endurance exercise performance. Iron deficiency has also been reported to adversely affect the immune system and has been associated with attenuation of natural killer cell (NK) activity. This study was conducted to examine the relationship between iron status and NK activity in highly conditioned female athletes. Ten collegiate female swimmers (SWM) and 9 inactive females (SED) participated in this investigation. Resting blood samples were obtained and analyzed for serum iron and ferritin. NK activity (% lysis) was determined using a whole blood method (51Cr release assay). No significant relationship was found between iron and NK activity (r = 0.55, p = .09), nor between serum ferritin and NK activity (r = 0.33. p = .35) for SWM. ANOVA revealed significantly greater NK activity for SWM (51.63 ± 15.79%) versus SED (30.34 ± 13.67%). Serum ferritin levels were not significantly different between SWM (20.38±8.62Ƞg · ml−1) and SED (16.79±10.53Ƞg · ml−1), nor were iron values different between groups (16.54 ± 2.17 μmol · L−1 SWM; 11.92 ± 2.61 μmol · L−1 SED). A significant relationship between iron status and resting immune function could not be established. Exercise training may affect NK activity; however, the influence of iron status on immune function requires further evaluation.