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M Helm

Publications and source records attributed to M Helm.

61 records · Page 4Linked to original sources
PubMed1987

Influence of nutritional factors on calcium-regulating hormones and bone loss.

UNLABELLED: The relationships between nutritional factors, calcium regulating hormones, and bone density were evaluated in three groups of normal subjects in rural southeast Kansas. Dietary intake of calcium (Ca), phosphorous (P), protein, and vitamin D; and serum 25OHD, Ca, P, parathyroid hormone (iPTH), and bone density (distal 1/3 radius) were measured in 29 elderly women, 35 elderly men, and 50 perimenopausal women. Measurements were repeated 5 years and 4 years later respectively in 16 elderly women and 15 elderly men. The r values for significant regression correlations for each group were as follows: perimenopausal: bone density and dietary Ca:P--r = .29, iPTH and 25OHD--r = -.38; elderly women: 25OHD and dietary Vitamin D(D)--r = .58, change in bone density (delta BD) and initial bone density (BDI)--r = -.71, delta BD and serum 25OHD--r = -.60, serum calcium and age--r = -.42; elderly men: Serum 25OHD and D--r = .61, iPTH and 25OHD--r = -.43, iPTH and serum phosphorous--r = .59. CONCLUSIONS: The more adequate the state of vitamin D nutriture, the lower the serum iPTH in perimenopausal women and elderly men and the less bone loss in elderly women. The Ca:P ratio in the diet may be important in maintaining bone density in perimenopausal women.

Adult↗
PubMedDate not supplied

Electromyographic and kinematic analysis of the shoulder during four activities of daily living in men with C6 tetraplegia.

The pattern of motor paralysis that commonly follows C6 tetraplegia creates an increased demand on upper limb function. The present investigation documented shoulder motion and muscular activity during planar motions and four activities of daily living (ADLs) in 15 men with spinal cord injuries (SCI) resulting in C6 tetraplegia. Three-dimensional (3-D) shoulder motion was recorded using a VICON motion system, and intramuscular electrodes recorded electromyographic (EMG) activity of 12 shoulder muscles. Active flexion and abduction required greater EMG than control subjects lifting a 2-kg weight. Relative EMG was similar for most muscles during hair combing, drinking, and reaching forward, although increased humeral elevation commonly resulted in a greater relative muscular effort. Hair combing had the most humeral elevation (90 degrees) with moderate to high levels of activation (32% to 63% maximum) recorded in the anterior deltoid, supraspinatus, infraspinatus, and scapular muscles. During reaching for the perineum, posterior deltoid and subscapularis activity dominated.

Activities of Daily Living↗