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Children and adolescents who have hypertension may be at risk for complications when exercise causes their blood pressure to rise even higher. The purpose of this statement is to update recommendations concerning the athletic participation of individuals with hypertension, including special populations such as those with spinal cord injuries or obesity, by using the guidelines from “The 36th Bethesda Conference: Eligibility Recommendations for Competitive Athletes with Cardiovascular Abnormalities”; “The Fourth Report on the Diagnosis, Evaluation, and Treatment of High Blood Pressure in Children and Adolescents”; and “The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure.”

Sleep management is one of the documented factors affecting safety and health. Using SLEEP (Sleep Loss Effects on Everyday Performance), a web-based model that integrates the dynamics of sleep to predict performance loss, aerial applicators licensed to work in the state of Louisiana were surveyed and evaluated for sleep deprivation. On and off season sleeping patterns were compared. During the off season, agricultural pilots reported having average sleeping time (6.9 hours), while during the farming season, because of their grueling schedule (sometimes working 100 hours a week), pilots reported sleeping only 3 hours per day in the week before the survey was made. Sleep deprivation greatly increases the chances of accidents. In the Mississippi delta region, 84% of the fatal accidents in the past nine years involving agricultural pilots were ruled as caused by human factors. Younger pilots are particularly at risk due to their limited flying experience and greater sleep needs. The agricultural pilot community would likely benefit from educational programs focused on better sleep management and the value and limitations of countermeasures to cope with fatigue.

A procedure was developed to estimate the design elevations for a terrace channel bottom by varying channel grade and using a cut and fill method. Mathematical equations were derived to evaluate the cut and fill requirements for broad-base, grass-backslope, and narrow-base terrace cross-sections. Equations were also developed to estimate relative earth movement or efficiency for a straight blade bulldozer, a universal blade bulldozer, and scraper equipment. The equations were the basis of a computer program that was developed to design and evaluate the terrace channel profile and cross-section. The program was evaluated using terrace input data from northeast Nebraska.

AN irrigation scheduling chart developed by C. M. Woodruff (1973) has been modified to use the Blane ^-Criddle procedure for predicting consumptive use. 1 his procedure eliminates the one crop and one soil type limitations of the Woodruff chart. The new irriga-tion scheduling chart was applied to corn and soybeans in 1978, 1979, and 1980. Crops thus scheduled have yielded as well as or better than from other scheduling procedures tested. The method is flexible, inexpensive, and easy to use. It has, to date, given high yields with reduced irrigation water compared to scheduling based on measured plant water stress.

A computer program has been developed to locate ter-race systems based on topographic information read from a contour map. It is generally applicable to all types of topography and can design conventional or parallel systems with single, multiple or branched outlets. The program has been tested and was found to work well in most cases.