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Biomedical subjects

G L Soderberg

Publications and source records attributed to G L Soderberg.

42 records · Page 3Linked to original sources
PubMed1978

Electromyographic study of three parts of the gluteus medius muscle during functional activities.

This study was undertaken to determine the onset, duration, and degree of electromyographic activity in the anterior, middle, and posterior segments of the gluteus medius muscle during functional activities. Fine wire electrodes were inserted into each muscle segment. After a triaxial hip electrogoniometer was applied, each of the 10 subjects performed the activities of walking, crawling, stair ascending and descending, shoetying, sitting, and single limb-standing with forward learning. Raw electromyographic records evaluated on the basis of on-off activity provided results showing that the onset, duration, and degree of activity of the three segments was similar for some activities. Results also established that asynchronous activity occurred for selected functional activities, thereby justifying a three-segment conceptual model of the gluteus medius muscle.

Electromyography↗
PubMed1978

Below-knee amputee knee extension force-time and moment characteristics.

This study, utilizing isometric knee extension, was undertaken to determine if significant differences existed between extremities of below-knee amputees and matched normal subjects in minimal time to production of peak force, maximal rate of tension development, and maximal extension moment. Results showed no significant differences for rate of tension development. Significance at the .05 level was established for moments produced by left amputees and their contralateral limb, and right and left limbs of normal subjects. Differences in time to 95 percent of peak force for the amputated leg were also significant when compared to the limb of the matched normal subject. Results indicate that quadriceps tension and rate of tension development are both factors to emphasize in therapeutic programs, particularly for the left knee of the below-knee amputee.

Adolescent↗
PubMed1977

The influence of isometric exercise and passive stretch on hip joint motion.

A method was designed to compare the effects of isometric contractions and passive stretch on modifying joint range of motion in 30 normal men. Subjects were randomly assigned into a control group, a passive stretch group, or an isometric contraction group. Each subject assumed a left sidelying position on the force table. Stabilization was applied to the pelvis and left lower extremity. The cuff, to which the force cable was attached, was applied to the right lower extremity. Force measurements produced by the isometric contractions or passive stretch procedures were stored on computer tape. The results of the mean differences in pelvifemoral angle measurements indicated that both treatment groups significantly increased their range of passive hip flexion with the knee extended when compared to the control group. Comparisons between the two treatment groups indicated that the isometric contraction and passive stretch procedures had significant and similar effects.

Adult↗
PubMedDate not supplied

Muscular function in chronic low-back dysfunction.

The purpose of this study was to use electromyography to determine the level and pattern of muscle activity of the rectus abdominus and T10, L1, and L3 erector spinae muscle in healthy subjects and patients with chronic low-back dysfunction during various postures and activities. Statistically significant differences in erector spinae activities were found between groups for the Valsalva maneuver and for portions of the sit-up exercise. Comparisons between the 4.5-kg and 16-kg lifts completed with bent and straight knees showed few differences during actual lifts, but the patients with chronic dysfunction maintained an increased level of activity when lifts had been completed.

Adult↗