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Biomedical subjects

G M Jensen

Publications and source records attributed to G M Jensen.

46 records · Page 3Linked to original sources
PubMed1985

Incidence of work-related low back pain in physical therapists.

The purpose of this study was to determine the incidence of work-related low back pain (LBP) in physical therapists and to identify common characteristics of therapists who reported work-related LBP. Questionnaires were mailed to a random sample of 500 registered physical therapists. Of the 344 (69%) questionnaires returned, 29 percent reported work-related LBP. The initial onset most frequently occurred between the ages of 21 and 30 years and within the first four years of experience as a physical therapist. Eighty-three percent of the therapists first incurred work-related LBP during treatment of patients, primarily in acute care and rehabilitation facilities. "Lifting with sudden maximal effort" and "bending and twisting" were frequent mechanisms of injury. Further research is necessary to investigate the effect work-related LBP has on productivity and quality of patient care within facilities and to identify preventive measures to decrease the incidence of work-related LBP.

Adult↗
PubMed1984

Comparison of methods of teaching children proper lifting techniques.

This study was designed to determine the effects of two teaching methods on children's ability to demonstrate and recall their mastery of proper lifting techniques. Seventy-six third and fifth grade public school children were divided by grade into three groups. Two of the groups (experimental) were taught the correct method for lifting a heavy object, either by lecture demonstration or guided discovery teaching format; one group (control) was not taught. The students' knowledge was measured pretest, one-week posttest, and eight-week posttest with a written and practical test. The students in the experimental groups in both grades significantly (p less than or equal to .001) increased their scores on the written portion of the test over those of the control groups on the one-week posttest. No group, however, showed significant gains on the practical portion. No differences were found between teaching methods. Results of this study stress the importance of evaluating verbally learned motor skills in a practical application format in school settings and in clinical patient education.

Child↗
PubMed1983

The effect of varied hip angles on the generation of internal tibial rotary torque.

Previous researchers have determined that 90 degrees of knee flexion is an appropriate angle to condition the internal tibial rotators. Because the majority of internal tibial rotators are two-joint muscles crossing both the knee and the hip, the influence of the hip angle on the generation of rotary torque was examined. The purpose of this study was to investigate the effect of four hip angles on the generation of internal tibial rotational torque with the knee positioned at 90 degrees of flexion. Forty subjects, 20 males and 20 females, were tested at four positions of hip flexion (120 degrees, 90 degrees, 45 degrees, 10 degrees) using a modified Cybex II isokinetic dynamometer, and their maximal mean internal rotary torque values were recorded. The subjects were placed in a custom-made orthotic-type boot to minimize the motions of the talo-calcaneal joint. Sixty percent of the males and 65% of the females generated their greatest absolute torque value at 120 degrees of hip flexion. A procedure investigating the rankings of the maximal mean torque values at each of the tested hip positions revealed a significant difference between the hip positions of 120 and 10 degrees for both populations (P less than 0.001), and the male population also demonstrated significance between the angles of 120 and 45 degrees and 90 and 10 degrees (P less than 0.05). The practical significance of this study offers some additional information regarding the appropriate positioning for rehabilitation of the internal tibial rotators. The data suggests that if maximal torque generation is desired, the internal tibial rotators should be tested and exercised with the hip flexed to 120 degrees to take advantage of the length-tension relationship and the biomechanical principles of the rotary muscles.

Adolescent↗
PubMed1980

Biomechanics of the lumbar intervertebral disk: a review.

This article reviews the literature on the biomechanics of the lumbar intervertebral disk according to: 1) disk structure and properties, 2) biomechanical principles and their application to the disk, 3) biomechanics and intradiskal pressures as they relate to posture, work, and exercise, and 4) prophylactic measures.

Back Pain↗
PubMed1979

Horizontal postrotatory nystagmus response in female subjects with adolescent idiopathic scoliosis.

Quantitative and qualitative assessment of vestibular function was made in 18 female subjects with adolescent idiopathic scoliosis and a control group of 25 female subjects without scoliosis. The Southern California Postrotary Nystagmus Test, which examines postrotatory nystagmus response, was used to assess the vestibular function of subjects in both groups. The results indicated that subjects with adolescent idiopathic scoliosis had a significantly decreased duration of postrotatory nystagmus as well as irregularities in nystagmus form. The recommendation was made that a neurological examination, including assessment of vestibular function, be incorporated into screening methods for scoliosis.

Adolescent↗
PubMedDate not supplied

Blood pressure responses to hypnotic and nonhypnotic suggestions in normotensive subjects.

Forty normotensive subjects participated on a voluntary basis in a study designed to compare the effect of suggestions on blood pressure (BP). Two experimental groups received suggestions presumed to be specific in lowering or raising BP after simple relaxation (relaxation group) or hypnotic induction (hypnotic group). A control group was used to record the BP changes over time. The time variable was significant for both systolic (SBP) and diastolic blood pressure (DBP). Induction procedures (hypnosis or relaxation) resulted in significant decreases in DBP in both experimental groups. In the control group there was a significant decrease in SBP. A specific suggestion to increase the BP resulted only in DBP increase in the hypnotic group. This group also gave an increase of both SBP and DBP over the entire experiment, whereas the relaxation group resulted in a significant decrease in SBP. There was no significant group variable, indicating no differences between the groups. Further research is needed to enable firm conclusions of the effect of suggestions on BP.

Adult↗
PubMedDate not supplied

The effect of specific hypnotic suggestions on blood pressure in normotensive subjects.

Twenty normotensive subjects participated on a voluntary basis in an experiment designed to study the effects of specific suggestions on blood pressure (BP). After an induction procedure, the experimental group received suggestions presumed to be relatively nonactivating, although capable of lowering or raising BP. A control group was used to record the BP changes over time. All subjects met for one session. Eight subjects from the experimental group met for a second session. Both adaptation and induction resulted in significant BP decreases. A specific suggestion to increase BP gave a significant result when compared to the induction point. There was no significant change from induction to the BP decrease suggestion. Both systolic and diastolic BP behaved in the same way. A second experimental session resulted in no significant change compared with the first session. Also, no significant difference was found in suggestibility scores from the first to the second session. The results are in line with previously published studies.

Adult↗