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Pedro Gómez-Carmona, Ismael Fernández-Cuevas, Manuel Sillero-Quintana, Javier Arnaiz-Lastras and Archit Navandar

. Study Design A cross-sectional and prospective study design was used to compare 2 injury prevention programs applied over 2 consecutive preseasons: a conventional injury prevention program (CPP) applied over the first preseason (48 d) and an infrared thermography injury prevention program (IRTPP

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Judith J. Prochaska, James F. Sallis, Donald J. Slymen and Thomas L. McKenzie

One mission of physical education (PE) is the promotion of enjoyable physical activity participation. PE enjoyment of 414 elementary school students (51% male, 77% Caucasian) was examined in a 3-year prospective study. Analyzed using Generalized Estimating Equations, PE enjoyment decreased significantly from the fourth to sixth grade (p < .001) and was lower among girls (p < .001) and students not in organized sports (p < .005). Ethnicity and body mass index were not significant predictors of PE enjoyment. Girls, older children, and those not on sports teams are especially dependent on PE as the setting for accruing health-related physical activity, and strategies are needed to enhance their PE enjoyment.

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Pia Laukkanen, Markku Kauppinen and Eino Heikkinen

Identifying predictors of functional limitations among the elderly is essential for planning and implementing appropriate preventive services. The purpose of this prospective study was to examine baseline physical activity as a predictor of health and functional ability outcomes 5 years later in people age 75 and 80 years at baseline. A clear trend was observed: The more physically active subjects had better health and functional ability compared to their more sedentary counterparts. After controlling for the baseline status, the degree of physical activity did not predict future disability but still maintained its predictive role at the level of disease severity. It is suggested that the level of habitual physical activity is an important predictor of health and functional ability among elderly people. Presumably, however, there is a reciprocal causal relationship between physical activity and health in elderly people. Physical activity counseling should therefore be included in preventive health strategies for the elderly.

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Chia-Lin Li, Feng-Hsuan Liu and Jen-Der Lin

The purpose of this prospective study was to examine the effect of physical activity independent of obesity on metabolic risk factors. A total of 358 participants were recruited from the Department of Health Management of Chang Gung Medical Center. Physical activity was assessed using a 3-d activity record. Body-mass index (BMI) and metabolic risk factors were also assessed. Our findings demonstrate that an effect of obesity that was statistically independent of the levels of physical activity is associated with metabolic risk factors. Moreover, physical activity displayed inverse associations with triglycerides, and fasting plasma glucose and a positive association with HDL cholesterol. Those participants with time spent in moderate activity more than 0.5 h each day had significantly less risk of high fasting glucose. Significantly, these associations were independent of BMI.

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Sara Wilcox, Cheryl Der Ananian, Patricia A. Sharpe, Jennifer Robbins and Theresa Brady

Background:

Physical activity (PA) is important for arthritis self-management. A better understanding of the PA correlates in persons with arthritis will help inform interventions.

Methods:

Computer searches were conducted on PubMed, PsychInfo, Current Contents, and Cinahl databases. Reference lists of extracted articles were also searched. Thirty-six studies published between 1976 and February 2004 met inclusion criteria.

Results:

PA correlates are presented for sociodemographic, psychological, health-related, social, and environmental categories. Self-efficacy, perceived benefits and barriers, mental well-being, prior PA, and pain received the most consistent support as PA correlates, whereas sociodemographic, social, and environmental variables were the least studied. Too few studies were conducted to allow comparisons across arthritis type or study design.

Conclusions:

We recommend that additional qualitative research be conducted to understand factors influencing PA in persons with arthritis. Prospective studies, particularly in the context of a PA program or intervention, would also be useful to better understand how barriers and enablers change over time.

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Jennifer L. Etnier

Alzheimer's disease is a chronic illness characterized by clinical cognitive impairment. A behavioral strategy that is being explored in the prevention of Alzheimer's disease is physical activity. Evidence from randomized controlled trials (RCTs) testing the effects of physical activity for cognitively normal older adults supports that physical activity benefits cognitive performance. Evidence from prospective studies supports a protective effect of physical activity with reductions in the risk of cognitive decline ranging from 28% to 45%. RCTs with cognitively impaired older adults also generally support positive effects with greater benefits evident for aerobic interventions. Research examining the potential moderating role of apolipoprotein E (APOE) has yielded mixed results, but the majority of the studies support that physical activity most benefits those who are at greatest genetic risk of Alzheimer's disease. Future directions for research are considered with an emphasis on the need for additional funding to support this promising area of research.

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Caroline A. Macera and Wilma Wooten

This review summarizes information on the rate of injury among adolescents who participate in specific sports or recreational activities. Injury-related mortality is high among adolescents, accounting for over 75% of the deaths occurring among those between 15 and 19 years of age, with about 5% of these deaths attributed to sports injuries. Several difficulties were encountered in conducting this review. There was no standard definition for injury, resulting in widely diverse operational definitions. The underlying denominator and time period used to obtain rates also varied widely. In spite of these difficulties, several sports were identified as particularly dangerous due to the nature of the injury: football for males and gymnastics for females. Consistent injury definitions and larger prospective studies are needed to confirm these rates and to identify risk factors.

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Becky L. Heinert, Thomas W. Kernozek, John F. Greany and Dennis C. Fater

Objective:

To determine if females with hip abductor weakness are more likely to demonstrate greater knee abduction during the stance phase of running than a strong hip abductor group.

Study Design:

Observational prospective study design.

Setting:

University biomechanics laboratory.

Participants:

15 females with weak hip abductors and 15 females with strong hip abductors.

Main Outcome Measures:

Group differences in lower extremity kinematics were analyzed using repeated measures ANOVA with one between factor of group and one within factor of position with a significance value of P < .05.

Results:

The subjects with weak hip abductors demonstrated greater knee abduction during the stance phase of treadmill running than the strong group (P < .05). No other significant differences were found in the sagittal or frontal plane measurements of the hip, knee, or pelvis.

Conclusions:

Hip abductor weakness may influence knee abduction during the stance phase of running.

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Simon M. Luethi, Edward C. Frederick, Michael R. Hawes and Benno M. Nigg

The purpose of this study was to analyze the influence of footwear on the kinematics and the mechanical load on the lower extremities during fast lateral movements in tennis. The method used was a prospective study. Two types of tennis shoes were randomly distributed among 229 tennis players. The subjects were measured before starting a 3-month test period. The study showed that the kinematics of the lower extremities and internal load conditions during fast lateral movements in tennis are highly influenced by the type of shoe worn. The results further suggest that a prospective biomechanical analysis can be used to establish assumptions concerning the etiology of pain and injuries in sports related activities.

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Nico W. Van Yperen

This prospective study was designed to identify psychological factors that predict career success in professional adult soccer. Post hoc, two groups were distinguished: (1) Male soccer players who successfully progressed into professional adult soccer (n = 18) and (2) Male soccer players who did not reach this level (n = 47). Differences between the two groups were examined on the basis of data gathered in the initial phase of their careers, 15 years earlier. The psychological factors that predicted career success while statistically controlling for initial performance level and demographic variables were goal commitment, engagement in problem-focused coping behaviors, and social support seeking. On the basis of their scores on the significant predictor and control variables, 84.6% of the adolescent youth players were classified correctly as successful or unsuccessful.