INDICATORS OF INHABITANT, HOUSEHOLD, FAMILY AND ECONOMIC GROWTH: SOUTH CAROLINA AND NORTH CAROLINA

Social and economic futures are dependent on numbers of housing units, families, households and individuals, and on many characteristics of aggregate populations. Research reported in this manuscript is focused on the states of North Carolina and South Carolina and the counties therein. The chief concern is change; e.g., numerical and percentage increase or decrease. These dynamics refer to basic components of population: births, deaths and residential relocation.Consumer/Household Economics,

Supersonic Cruise Technology

The history and status of supersonic cruise research is covered. The early research efforts of the National Advisory Committee for Aeronautics and efforts during the B-70 and SST phase are included. Technological progress made during the NASA Supersonic Cruise Research and Variable Cycle Engine programs are presented. While emphasis is on NASA's contributions to supersonic cruise research in the U.S., also noted are developments in England, France, and Russia. Written in nontechnical language, this book presents the most critical technology issues and research findings

The Effect of External Ankle Support on Lower Extremity Biomechanics

ACL injury risk has been related to abnormal frontal plane knee mechanics. It’s not clear whether constraining another lower extremity joint with bracing or taping might contribute to this increased injury risk by altering knee movements. PURPOSE: To examine the effect of external ankle support on lower extremity kinematics during a drop landing. METHODS: Twenty-five participants (20.3 ± 1.2 years, 168.7 ± 32.9 cm, 78.0 ± 14.9 kg) performed drop landings from a height of 61 cm under three conditions; no ankle support, athletic tape, and a lace-up ankle brace. The subject performed three trials per condition. Sixteen reflective markers were placed on the lower extremity to produce a modified Helen Hayes lower-extremity model. The subject then completed a 3-minute walking trial at a self-selected speed prior to completing each set of trials for the three landing conditions. Three-dimensional ankle, knee, and hip kinematics were collected using the Vicon Nexus 2 System. Knee and hip angles in the frontal and sagittal plane upon landing were determined. Ankle movement during landing was computed as the range of motion of the ankle angle in the sagittal plane from initial ground contact to the lowest point achieved during the landing phase. RESULTS: Mean ± SD ankle movement within the sagittal plane in the ankle tape condition (13.7±6.0 degrees) was significantly less (pCONCLUSION: This present study showed only the taped condition restricted ankle motion during the landing. However, the frontal plane knee motion was only affected when the ankle brace was used. While it is not clear why this occurred, it may be related to altering the proprioception of the ankle with the brace