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Results for “Commuting”

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At least 145 records · Page 8Linked to original sources
PubMed2003

The incremental variance problem: enhancing the predictability of academic success in an urban, commuter institution.

The authors identified variables that enhance the predictability of academic performance and retention in an urban, commuter college. They used a longitudinal design with 2 waves of data collection: prior to 1st-semester attendance and again 6 semesters later. The results support the following conclusions: (a) After controlling for precollege indices of academic ability, specific variables within demographic, personal behavior, expectations, and attitudinal domains improved the predictability of grade point average by 15.5% for Whites and 20.3% for Blacks; overall, these analyses accounted for 61% of the variance in grade point average for Whites and 47% for Blacks; (b) for retention, the comparable increment in predictability was 2.5% for Whites and less than 1% for Blacks; overall, the percentage of retention variance accounted for was 42% for Whites and 29% for Blacks; and (c) a paradoxical finding was the combination of a positive correlation between high school average and students' expected grades on tests and a negative correlation between expected and actual grades. The paradox is resolved by citing data that demonstrate (a) a disparity between high school grades and independently measured academic accomplishment; (b) the consequent false attributions students draw about their academic abilities; and (c) the impact of these false attributions on the priority students place on their academic responsibilities.

Adolescent↗
PubMedDate not supplied

[New artificial lung respiration apparatuses for anesthesia and design of gas flow commutators].

The principles of action of new anesthetic devices and apparatuses for mechanical lung ventilation (MLV) including alternate-flow inhalation generators designed in recent time in VNIIMP-VITA, Ltd. are considered. According to the type of drive, these apparatuses fall into groups of devices with pneumatic drive (Diana) and electric drive (Elan). New technological approaches to design of gas flow commutators for pneumatic drive and respiratory contours of MLV apparatuses are discussed. The design of a new source of stable pneumatic signals providing reliable operation of the control valves of the inhalation and exhalation contours of electrically driven apparatuses. This source allows necessary MLV modes to be implemented during anesthesia.

Anesthesiology↗
PubMed1994

Physically active commuting to work--testing its potential for exercise promotion.

Physical activity has considerable health-enhancing potential. It will be realized, however, only if large number of people participate in adequate activity. This summary report describes the main results of four studies aimed to find out whether physically active commuting to work (PACW) meets the requirements of health and fitness enhancing activity. Three successive mail inquiries (N = 2014) indicated that PACW provided habitual exercise to one-third of employed urban population, and that more than one-fifth expressed willingness and being able to increase PACW. A randomized controlled trial on 68 inactive middle-aged men and women revealed that PACW (1 h daily for 10 wk) increased VO2max by 4.5% (P = 0.02), maximal treadmill time by 10.3% (P = 0.0007), and HDL cholesterol by 5% (P = 0.06). A demonstration project in a large industrial plant showed that PACW can be successfully promoted by low cost measures. In conclusion, these studies suggest that PACW may offer substantial potential as health and fitness enhancing measure provided that it can be practiced safely.

Bicycling↗
PubMed2001

Impact of changes in transportation and commuting behaviors during the 1996 Summer Olympic Games in Atlanta on air quality and childhood asthma.

CONTEXT: Vehicle exhaust is a major source of ozone and other air pollutants. Although high ground-level ozone pollution is associated with transient increases in asthma morbidity, the impact of citywide transportation changes on air quality and childhood asthma has not been studied. The alternative transportation strategy implemented during the 1996 Summer Olympic Games in Atlanta, Ga, provided such an opportunity. OBJECTIVE: To describe traffic changes in Atlanta, Ga, during the 1996 Summer Olympic Games and concomitant changes in air quality and childhood asthma events. DESIGN: Ecological study comparing the 17 days of the Olympic Games (July 19-August 4, 1996) to a baseline period consisting of the 4 weeks before and 4 weeks after the Olympic Games. SETTING AND SUBJECTS: Children aged 1 to 16 years who resided in the 5 central counties of metropolitan Atlanta and whose data were captured in 1 of 4 databases. MAIN OUTCOME MEASURES: Citywide acute care visits and hospitalizations for asthma (asthma events) and nonasthma events, concentrations of major air pollutants, meteorological variables, and traffic counts. RESULTS: During the Olympic Games, the number of asthma acute care events decreased 41.6% (4.23 vs 2.47 daily events) in the Georgia Medicaid claims file, 44.1% (1.36 vs 0.76 daily events) in a health maintenance organization database, 11.1% (4.77 vs 4.24 daily events) in 2 pediatric emergency departments, and 19.1% (2.04 vs 1.65 daily hospitalizations) in the Georgia Hospital Discharge Database. The number of nonasthma acute care events in the 4 databases changed -3.1%, +1.3%, -2.1%, and +1.0%, respectively. In multivariate regression analysis, only the reduction in asthma events recorded in the Medicaid database was significant (relative risk, 0.48; 95% confidence interval, 0.44-0.86). Peak daily ozone concentrations decreased 27.9%, from 81.3 ppb during the baseline period to 58.6 ppb during the Olympic Games (P<.001). Peak weekday morning traffic counts dropped 22.5% (P<.001). Traffic counts were significantly correlated with that day's peak ozone concentration (average r = 0.36 for all 4 roads examined). Meteorological conditions during the Olympic Games did not differ substantially from the baseline period. CONCLUSIONS: Efforts to reduce downtown traffic congestion in Atlanta during the Olympic Games resulted in decreased traffic density, especially during the critical morning period. This was associated with a prolonged reduction in ozone pollution and significantly lower rates of childhood asthma events. These data provide support for efforts to reduce air pollution and improve health via reductions in motor vehicle traffic.

Adolescent↗
PubMed2001

RNA commutes to work: regulation of plant gene expression by systemically transported RNA molecules.

Although long-distance movement of endogenous mRNAs in plants is well established, the functional contributions of these transported RNA molecules has remained unclear. In a recent report, Kim et al.2001 showed that systemically transported mRNA is capable of causing phenotypic change in developing tissue. Here, this finding and its significance are reviewed and discussed in detail. In addition, in order to give proper perspective, long-distance transport of other types of RNAs, e.g., RNA elicitors of post-transcriptional gene silencing and RNA genomes of plant viruses, and its possible regulation are discussed.

Biological Transport↗