Volume contents

Volume Contents

Volume contents     

Return to nature

Abstract

This essay explores the various ways in which in the history of philosophy the imperative to return to nature has been understood. Against this background, it takes up the question as to how the concept of nature is to be determined in contemporary thought.     

Personal and environmental factors associated with physical inactivity among different racial-ethnic groups of U.S. middle-aged and older-aged women.

Personal, program-based, and environmental barriers to physical activity were explored among a U.S. population-derived sample of 2,912 women 40 years of age and older. Factors significantly associated with inactivity included American Indian ethnicity, older age, less education, lack of energy, lack of hills in one's neighborhood, absence of enjoyable scenery, and infrequent observation of others exercising in one's neighborhood. For all ethnic subgroups, caregiving duties and lacking energy to exercise ranked among the top 4 most frequently reported barriers. Approximately 62% of respondents rated exercise on one's own with instruction as more appealing than undertaking exercise in an instructor-led group, regardless of ethnicity or current physical activity levels. The results underscore the importance of a multifaceted approach to understanding physical activity determinants in this understudied, high-risk population segment.     

Patterns of sedentary behavior among adolescents.

OBJECTIVE: Reducing certain sedentary behaviors (e.g., watching television, using a computer) can be an effective weight loss strategy for youth. Knowledge about whether behaviors cluster together could inform interventions. STUDY DESIGN: Estimates of time spent in 6 sedentary behaviors (watching television, talking on the telephone, using a computer, listening to music, doing homework, reading) were cluster analyzed for a sample of 878 adolescents (52% girls, mean age = 12.7 years, 58% Caucasian). MAIN OUTCOME MEASURES: The clusters were based on the sedentary behaviors listed above and compared on environmental variables (e.g., household rules), psychosocial variables (e.g., self-efficacy, enjoyment), and health behaviors (e.g., physical activity, diet). RESULTS: Four clusters emerged: low sedentary, medium sedentary, selective high sedentary, and high sedentary. Analyses revealed significant cluster differences for gender (p < .002), age (p < .002), body mass index (p < .001), physical activity (p < .01), and fiber intake (p < .01). CONCLUSIONS: Results suggest a limited number of distinct sedentary behavior patterns. Further study is needed to determine how interventions may use cluster membership to target segments of the adolescent population.     

Psychophysiological adaptation: An investigation of multiple parameters

Heart rate (EKG), digital skin resistance level (SRL), and frontalis electromyography (EMG) of 20 undergraduate volunteers were monitored in three 30-min sessions to chart the course and magnitude of adaptation. As a group, 7, 13, and 13 min of adaptation were required for SRL, EMG, and EKG, respectively. High arousal levels in any of these measures at the session's outset resulted in longer adaptation times compared to low initial arousal. EMG showed the strongest variance across sessions. Females required longer adaptation periods than males in SRL and EKG. Self-reported trait anxiety levels bore little relationship to adaptation course. Methods were outlined for setting individualized adaptation periods by either the min 1 EMG level or regression equations for the initial values of each of the measures. Overall, psychophysiological adaptation proved to be an influential variable requiring experimental management to avoid confoundment with treatment effects.Portions of this research were presented at the meeting of the Southeastern Psychological Association, Washington, D.C., March 1980. We gratefully acknowledge statistical consultation given by Virginia Weymouth, Memphis State University Department of Computer Services, and Dr. Michael Lupfer.     

Effacements of Form

The theme of this essay is expressed in a line from the Dao De Jing： ＂The great image has no form.＂ The essay shows how this effacement, annulment, or withdrawal of form is realized in ancient Chinese painting （Song and Ming Dynasties） and in the conception of the natural elements to which much of this painting is related. Certain resonances with this effacement of form are identified in the way that recent Continental thought focuses on an effacement of form as it was determined in ancient Greek philosophy.     

Perceived environmental predictors of physical activity over 6 months in adults: activity counseling trial.

PURPOSE: In the present study, the authors extend previous cross-sectional findings by using a prospective design to determine whether physical and social environmental characteristics predict physical activity over 6 months. DESIGN: Inactive adults were recruited to the Activity Counseling Trial, a multicenter, randomized, controlled trial of physical activity intervention in primary care. Participants were 387 women and 474 men aged 35-75 years in 3 regions; 1/3 were minorities; 56% had some college education. Baseline perceived environmental variables were used to predict physical activity at 6 months, adjusting for experimental condition and other potential moderators. MEASURES: The validated 7-day physical activity recall interview was used to estimate minutes of moderate to vigorous physical activity. A standardized survey was used to measure social and physical environmental variables around the home and neighborhood. RESULTS: Women reporting no unattended dogs and low crime in their neighborhoods and men reporting frequently seeing people being active in their neighborhoods did 50-75 more minutes of physical activity per week than did those with different environmental characteristics. Interactions of environmental variables with age group suggested that older adults may be more affected by environmental variables than are younger adults. CONCLUSIONS: Self-reported social and physical environmental variables were significantly related to moderate to vigorous physical activity among a diverse sample of adults living in 3 regions of the United States. These prospective findings strengthen the conclusion from previous cross-sectional studies that environmental variables are important correlates of physical activity.