College students' motivation for physical activity: differentiating men's and women's motives for sport participation and exercise

Despite the many clear benefits of an active lifestyle, lack of physical activity is a significant health problem in the college population. A key issue in physical activity research is developing an understanding of motivation. Although physical activity takes many forms, most research designed to enhance motivation for and adherence to physical activity focuses on exercise behavior and ignores sport participation. In this study, the authors compare motivations for sport participation versus exercise among college students. Results indicate that participants were more likely to report intrinsic motives, such as enjoyment and challenge, for engaging in sport, whereas motivations for exercise were more extrinsic and focused on appearance and weight and stress management. The findings suggest that motives for sport participation are more desirable than those for exercise and may facilitate improved adherence to physical activity recommendations.     

Union characteristics and organizing success

Using archival data, 12 independent variables pertaining to organizing strategy, organizing resources, and financial resources were used to predict the NLRB certification election success rates of national unions in three different time periods. The more than 50 unions participated in more than 75 percent of such elections. Relative to the hypothesized relationships, a mixed set of results was obtained. Possible explanations for these results, along with suggestions for more refined measurement procedures, are offered in terms of future research needs. Financial support for this project was provided by the Graduate School Research Committee at the University of Wisconsin-Madison and by the Graduate and Research Committee, College of Business at the Ohio State University. Data analysis was provided by Kyu Hwang. We thank Marick Masters, Anne Miner, and Craig Olson and an anonymous reviewer for comments. An earlier version of this paper was presented at the Academy of Management meeting, Chicago, August 1986.     

Determinants of the decertification process: Evidence from employer-initiated elections

There have been relatively few studies on why workers choose to decertify a union as their bargaining unit and virtually no empirical studies on the outcomes of employer-initiated representation elections. Using data from the NLRB monthly election reports (1977–1981), we attempt to analyze the factors that seem to influence the outcomes of employer-initiated representation elections with an incumbent union. Variables in our analysis include size of the election unit, region, industrial classification, type of incumbent union, and the state of the local economy. While the data show a concentration of elections on the West Coast, there is no significant difference in the ability of unions there to “win” decertification elections.     

Emissions from Mass Burn Resource Recovery Facilities

Recent resource recovery facility stack tests have increased the available pool of data on emissions from these facilities. This has led to more accurate predictions of emissions from proposed facilities. The source, type, and rate of emissions presented are based upon a review of the literature, theoretical approaches, stack test data from existing facilities, permit levels of other facilities, and discussions with equipment manufacturers. The pollutants selected for study are those regulated by United States Environmental Protection Agency (USEPA) Prevention of Significant Deterioration (PSD) regulations and other pollutants of concern. The pollutants studied are particulate matter, sulfur dioxide, nitrogen oxides, carbon monoxide, nonmethane hydrocarbons, hydrogen sulfide, reduced sulfide, reduced sulfur compounds, total reduced sulfur, lead, mercury, beryllium, arsenic, cadmium, chromium, chromium +6, copper, manganese, nickel, vanadium, zinc, hydrogen chloride, fluorides, sulfuric acid mist, polynuclear aromatic hydrocarbons, polychlorinated biphenyls, vinyl chloride, dioxins, furans, formaldehyde, and asbestos.     

Phytosociological analysis of restored and managed grassland habitat within an urban national park

Floyd Bennett Field (FBF), 579 ha in extent, is a division of Gateway National Recreation Area. It is the site of a former airfield, constructed by filling salt marshes with dredged materials. Except for the portion known locally as the North Forty, all sections of FBF have been cut over to maintain low vegetation. A grassland management plan (GRAMP) for 165 ha was initiated in 1986, to maintain habitats for open-country birds. Over the next few years, encroaching woody vegetation was removed manually and mechanically from the management area. Since then, it has been maintained as a grassland and receives annual mowing, as well as continued manual removal of the larger woody sprouts.A portion of the GRAMP management area (III) was selected for intensive study of vegetation composition. A grid system was created and vegetation cover was estimated in 127, 1 m × 1 m quadrats. The quadrats were subjected to cluster analysis (CA). Eleven clusters were recognized. These clusters were treated as plant associations. The following types were distinguished: (native) little bluestem–dewberry grassland, six-weeks fescue annual grassland, a grass marsh, a rush marsh, a switchgrass dry grassland, and a deer-tongue panicgrass grassland; (exotic) mugwort herbland, oriental bittersweet-Japanese honeysuckle vineland, Kentucky bluegrass-mixed grassland, Japanese knotweed tall herbland, and spotted knapweed-common St. Johnswort herbland. The little bluestem–dewberry association accounted for nearly half of all quadrats; six subclusters were recognized. The plant associations determined by CA were compared with plant lists compiled during traverses of all of the map categories in the six GRAMP Areas (I, II, III, IV, V, VI). A table was created to relate the quantitative data of the plant associations to the appropriate map categories. A nonmetric multidimensional scaling ordination (NMDS) was performed on the quadrat data. Finally, the plant associations were compared with those described in the literature of local vegetation studies. The mowing program has been effective in decreasing woody plant cover and has permitted the invasion of a few taxa into monospecific communities, but attendant disturbance of the substrate is likely to cause an increase in exotic plant taxa. As earlier studies noted, mowing has caused the increase in cover of sod-forming grass, and bare ground has virtually disappeared in the managed area. This has negative implications for the maintenance of those grassland bird species that require open ground for nesting.     

Interpersonal Perceptions of Narcissism in an At‐Risk Adolescent Sample: A Social Relations Analysis

This study utilized Kenny's social relations model (SRM) to explore the interpersonal correlates of narcissism in an adolescent sample from a voluntary residential program. Participants were forty‐seven 16–18‐year‐olds (24 males, 23 females) attending a 22‐week residential program. Participants completed a self‐report measure of narcissism and rated one another on narcissism‐related traits and social status variables. Individuals with high levels of self‐reported narcissism were perceived by peers as antagonistic and likely to engage in future delinquency. Self‐reported narcissism was also associated with peer perceptions of narcissism‐related traits. Therefore, adolescent narcissism seems to be detected by peers and is associated with peer perceptions of some negative qualities. Potential implications of these findings are discussed.     

婚姻形式与生育水平:对中国农村三个县的考察

应用在招赘婚姻高度流行区、中度流行区和低度流行区的调查数据 ,研究了婚姻形式以及个人、家庭和社会因素对生育水平的影响及其区域差异。研究结果有助于理解农村人口在社会转型中婚姻与生育的变化过程和后果 ,为在农村稳定低生育率提供新的思路和途径。     

Replacing eye trackers in ongoing studies: A comparison of eye-tracking data quality between the Tobii Pro TX300 and the Tobii Pro Spectrum

The Tobii Pro TX300 is a popular eye tracker in developmental eye-tracking research, yet it is no longer manufactured. If a TX300 breaks down, it may have to be replaced. The data quality of the replacement eye tracker may differ from that of the TX300, which may affect the experimental outcome measures. This is problematic for longitudinal and multi-site studies, and for researchers replacing eye trackers between studies. We, therefore, ask how the TX300 and its successor, the Tobii Pro Spectrum, compare in terms of eye-tracking data quality. Data quality—operationalized through precision, accuracy, and data loss—was compared between eye trackers for three age groups (around 5-months, 10-months, and 3-years). Precision was better for all gaze position signals obtained with the Spectrum in comparison to the TX300. Accuracy of the Spectrum was higher for the 5-month-old and 10-month-old children. For the three-year-old children, accuracy was similar across both eye trackers. Gaze position signals from the Spectrum exhibited lower proportions of data loss, and the duration of the data loss periods tended to be shorter. In conclusion, the Spectrum produces gaze position signals with higher data quality, especially for the younger infants. Implications for data analysis are discussed.     

Univariate fast initial response statistical process control with taut strings

We present a novel real-time univariate monitoring scheme for detecting a sustained departure of a process mean from some given standard assuming a constant variance. Our proposed stopping rule is based on the total variation of a nonparametric taut string estimator of the process mean and is designed to provide a desired average run length for an in-control situation. Compared to the more prominent CUSUM fast initial response (FIR) methodology and allowing for a restart following a false alarm, the proposed two-sided taut string (TS) scheme produces a significant reduction in average run length for a wide range of changes in the mean that occur at or immediately after process monitoring begins. A decision rule for when to choose our proposed TS chart compared to the CUSUM FIR chart that takes into account both false alarm rate and average run length to detect a shift in the mean is proposed and implemented. Supplementary materials are available online.