Serum levels of vitamins A, C, and E in persons with chronic spinal cord injury living in the community.

Objectives: To determine serum levels of vitamins A, C, and E among individuals with spinal cord injury (SCI) living in the community, to compare these levels with general population norms, and to assess their association with demographic and injury-related data (age at onset, time since onset, level and completeness of injury), function, nutritional behaviors, and health status.

Design: Descriptive and correlational.

Setting: General community.

Dietary and serum lipids in individuals with spinal cord injury living in the community.

A cross-sectional study of 189 community-dwelling persons with spinal cord injury (SCI) (a) assessed levels of dietary and serum lipids, (b) determined the proportion of persons whose levels were out of the recommended/desired range, and (c) identified predictors of dietary and serum lipids. Lipid levels were out of range for a substantial proportion of the sample. Older persons were likely to have higher serum cholesterol and higher triglyceride levels than younger persons.

Factors which influence alterations of phosphates and pH in exercising human skeletal muscle: measurement error, reproducibility, and effects of fasting, carbohydrate loading, and metabolic acidosis.

Previous studies have shown considerable variability in the metabolic response of human skeletal muscle during a standardized exercise protocol. The goal of these studies was to investigate the factors responsible for the broad range of metabolic changes produced by fatiguing exercise. Experiments were performed to quantitate the measurement error of 31P nuclear magnetic resonance spectroscopy of human muscle, the reproducibility of changes within a single subject, and the effects of fasting, carbohydrate loading, and metabolic acidosis.

Phosphorylation of vertebrate nonmuscle and smooth muscle myosin heavy chains and light chains.

In this article we review the various amino acids present in vertebrate nonmuscle and smooth muscle myosin that can undergo phosphorylation. The sites for phosphorylation in the 20 kD myosin light chain include serine-19 and threonine-18 which are substrates for myosin light chain kinase and serine-1 and/or -2 and threonine-9 which are substrates for protein kinase C. The sites in vertebrate smooth muscle and nonmuscle myosin heavy chains that can be phosphorylated by protein kinase C and casein kinase II are also summarized.