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Biomedical subjects

J Styf

Publications and source records attributed to J Styf.

48 records · Page 3Linked to original sources
PubMed1988

Intramuscular pressure in the supraspinatus muscle.

Shoulder pain correlated to manual labour is an increasing problem. The etiology is multifactorial and often unclear. High local muscle load and muscle ischemia in the supraspinatus muscle is present in elevated arm positions, as shown in several electromyographic studies. The purpose of this study was to evaluate intramuscular pressure (IMP) as a way to describe local muscle load in the supraspinatus muscle. Measurements were made in 15 arm positions, and with hand loads of 0, 1, or 2 kg weight, in 12 shoulders. The IMP was recorded with microcapillary infusion technique. The method was found to be suitable in recording IMP at rest and during exercise. High intramuscular pressures, i.e., above 50 mm Hg (6.7 kPa), were seen in moderate humeral abduction. The IMP increased further in abduction up to 90 degrees, where mean IMP was 122 mm Hg (16.2 kPa). Added hand load increased intramuscular pressure in all positions except in shoulder flexion of 135 degrees. The study thus demonstrated that intramuscular pressure offers important information about the load on the supraspinatus muscle in different positions of the arm. The results indicate that fatigue and shoulder pain related to elevated arm positions may be caused by muscle ischemia induced by the high intramuscular pressure present in these positions.

Adult↗
PubMed1988

Intramuscular pressure and muscle blood flow in supraspinatus.

Intramuscular pressure and muscle blood flow was measured in the supraspinatus muscle in 6 healthy subjects. The recordings were performed at rest, during isometric exercise, during an isometric muscle contraction of 5.6 kPa (42 mm Hg) and 10.4 kPa (78 mm Hg) and at rest after the contraction. Intramuscular pressure was measured by the microcapillary infusion technique, and muscle blood flow by the Xenon-133 washout technique. Intramuscular pressure was 38.2 kPa (SD 12.0) (287 mm Hg) during maximal voluntary contraction. A muscle contraction pressure of 5.6 kPa (42 mm Hg), which is 16% of maximal voluntary contraction, reduces local muscle blood flow significantly. It is concluded that the high intramuscular pressures found in supraspinatus during work with the arms elevated impedes local muscle blood flow.

Adult↗
PubMed1987

Chronic compartment syndrome in the first dorsal interosseous muscle.

Fifteen patients with clinical signs that could indicate a chronic compartment syndrome of the first dorsal interosseous muscle of the hand were investigated by pressure recording at rest and during exercise. Objective data, verifying such a syndrome, were found in four of the patients. Increased muscle relaxation pressure during exercise and intramuscular pressure at rest after exercise compared with normal pressure were well correlated to the development of the symptoms of chronic compartment syndrome. Fasciotomy of the first dorsal interosseous muscle relieved the symptoms and normalized the pressure.

Adult↗
PubMed1987

Pressure in the erector spinae muscle during exercise.

The microcapillary infusion method was evaluated in recording intramuscular pressure during isometric and concentric exercise of the erector spinae muscle. Intramuscular pressure at rest was 6.1 (SD = 1.4) mm Hg without infusion and 8.3 with an infusion rate of 1.5 ml/hour. When the subject experienced muscle fatigue during exercise, the muscle relaxation pressure had increased to 14 mm Hg. The erector spinae muscle was found to be heavily loaded during exercise with an average muscle contraction pressure of 175 mm Hg. Recording of intramuscular pressure in the erector spinae muscle during exercise tests can be an additional method in the study of ergonomics and biomechanics of the spine as well as in the diagnosis of chronic compartment syndrome in this muscle.

Adult↗
PubMed1987

Chronic compartment syndrome in the erector spinae muscle.

Intramuscular pressure in the erector spinae muscle was measured during exercise with the microcapillary infusion method in 12 highly selected patients with recurrent low-back pain. The criteria for selection were low-back pain induced only by exercise, relief of symptoms at rest, and no neurologic deficits in the lower extremities. During a 4-year period, 12 patients fulfilled these criteria. One patient had a unilateral chronic compartment syndrome. Fasciotomy of the erector spinae muscle normalized the intramuscular pressure during exercise and at rest after exercise, and relieved the pain. All the other patients with chronic low-back pain had normal intramuscular pressure findings. Chronic compartment syndrome in the erector spinae muscle seems to be an extremely uncommon cause of exercise-induced low-back pain.

Adult↗
PubMed1987

Intramuscular pressure and muscle blood flow during exercise in chronic compartment syndrome.

In nine patients with chronic compartment syndrome, the intramuscular pressure and muscle blood flow during constant dynamic exercise was studied by the microcapillary infusion method and by the 133-xenon clearance technique. Although muscle blood flow was normal at the start of exercise, pain and impaired muscle function eventually developed; muscle blood flow decreased while muscle relaxation pressure increased. The changes of muscle blood flow could not be correlated with any change of mean muscle pressure during exercise. Eight months after fasciotomy the exercise test was repeated. Patients experienced no symptoms and the muscle relaxation pressure and blood flow during exercise were normal. It is suggested that chronic compartment syndrome is due to increased muscle relaxation pressure during exercise which causes decreased muscle blood flow, leading to ischaemic pain and impaired muscle function.

Adolescent↗
PubMed1984

Muscular compartment pressure following reconstructive arterial surgery of the lower limbs.

Intramuscular pressure in the anterior tibial compartment and calf circumference were measured daily during six days following reconstructive surgery for lower limb atherosclerosis in 31 patients. Both intramuscular pressure and calf circumference were significantly increased in the operated extremity from the first postoperative day. Maximum intramuscular pressure was found on the second postoperative day. No patient developed a compartment syndrome. Calf circumference increased more slowly and reached maximum on the fifth postoperative day. Following successful reconstructive arterial surgery intramuscular pressure and calf circumference increased most in patients undergoing dissection of the groin and leg, probably reflecting intraoperative damage of lymphatic vessels. In four patients where the reconstructive arterial surgery failed intramuscular pressure and calf circumference remained unchanged postoperatively despite dissection of the groin and leg. Thus, the present study suggests that both impaired lymphatic drainage and increased capillary filtration contribute to the development of increased intramuscular pressure and calf circumference following reconstructive arterial surgery of the leg.

Aged↗
PubMedDate not supplied

Diagnosis of exercise-induced pain in the anterior aspect of the lower leg.

Ninety-eight patients with chronic exercise-induced pain in the anterior compartment of the lower leg underwent extensive clinical and laboratory investigations to establish the diagnosis. They all were referred because of a putative chronic compartment syndrome (CCS). Intramuscular pressure was recorded bilaterally during exercise in the anterior tibial muscle in all of them. Conduction-velocity recordings of the deep and superficial peroneal nerves were performed in 29 patients. Other investigations included radiography, plethysmography, and scintigraphy. CCS was diagnosed in 26 of the 98 patients. Other diagnoses included periostitis in 41 patients, compression of the superficial peroneal nerve in 13, and miscellaneous other diagnoses in 18. CCS seems to be an uncommon reason for anterior pain in the lower legs.

Adolescent↗
PubMedDate not supplied

Posteromedial pain in the lower leg.

Intramuscular pressure was recorded in 28 patients with exercise-induced posteromedial pain in the lower leg. Pressure was recorded simultaneously in the posterior tibial muscle and in the flexor digitorum muscle during an exercise test and at rest after exercise. This study shows that intramuscular pressures during exercise and the time period for normalization of the pressure at rest after exercise were within normal limits. The result of pressure recording depends on which muscle in the deep posterior compartment is investigated and on the type of work performed. This article describes some of the difficulties associated with pressure recording in the deep posterior compartment. Chronic compartment syndrome in the deep posterior compartment as a reason for pain in the posteromedial part of the lower leg could not be demonstrated.

Adult↗
PubMedDate not supplied

The influence of external compression on muscle blood flow during exercise.

Intramuscular pressures and muscle blood flow were measured in the anterior tibial muscle during dynamic concentric exercise in 14 subjects. Pressures were recorded by the microcapillary infusion method and muscle blood flow by the 133-Xenon clearance technique. Muscle blood flow during constant exercise decreased from 34.5 (SD = 10.3) to 10.6 (SD = 4.9) ml/100 g/min (P less than 0.001) when muscle relaxation pressure was increased from 13.5 (SD = 2.7) to 39.9 (SD = 9.0) mm Hg by external compression. Muscle relaxation pressure during exercise is the intramuscular pressure between contractions. External compression of the lower limb during exercise impedes muscle blood flow by increasing muscle relaxation pressure. The experimental model seems suitable to study the influence of external compression by knee braces on intramuscular pressure during exercise.

Adult↗