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PubMed2003

[Estimation of motor ranges and muscle strength in cervical spine after total laryngectomy].

After total laryngectomy and after complementary treatment (radiotherapy) there are many functional disorders in the range of head and neck. It was observed, that muscles of this area became weakened with simultaneous increase of their rest tension. These changes affect reduction of physiological motor range of the cervical spine. Comparison of function of cervical muscle between patients after total laryngectomy and healthy people allows to characterize defects of neck movements. Detailed estimation of muscle strength and move range in cervical spine after total laryngectomy will enable application of effective physiotherapy program.

Adult↗
PubMed2002

Rotational muscle strength of the limb after anterior cruciate ligament reconstruction using semitendinosus and gracilis tendon.

PURPOSE: To investigate the influence of harvesting semitendinosus and gracilis tendons on the rotational muscle strength of the limb after anterior cruciate ligament (ACL) reconstruction. TYPE OF STUDY: Prospective study. METHODS: We performed a prospective study of 62 consecutive (34 male, 28 female) patients with ACL reconstructions using the semitendinosus and gracilis tendons. The mean age at surgery was 20.8 years. The semitendinosus tendon was harvested in 32 patients (ST group), and semitendinosus and gracilis tendons in 30 patients (STG group). The peak isokinetic torques for extension, flexion, internal rotation, and external rotation were measured before and 12 months after ACL reconstruction using the Cybex 6000B system (Cybex Division of Lumex, Ronkonkoma, NY). The rotational torque was measured at 30 degrees/sec and 120 degrees/sec. RESULTS: Before reconstruction, the mean isokinetic peak torque of the involved limb was decreased in extension and internal rotation. The mean isokinetic peak torque of the involved limb in extension recovered 12 months after ACL reconstruction; however, the weakness in internal rotation persisted. The preoperative weakness of the involved limb in extension and internal rotation recovered in the male patients, but not in the female patients after postoperative rehabilitation. The peak torque of the involved limb in internal rotation was decreased in the STG group, but not in the ST group. CONCLUSIONS: The internal rotational torque was influenced by harvesting the semitendinosus and gracilis tendons after ACL reconstruction, especially in female patients and patients from whom the gracilis tendon was harvested. Semitendinosus and gracilis tendons are important for the internal rotation of the limb and it was difficult to compensate for this function. Thus, we recommend harvesting the semitendinosus tendon only if tendon quality is sufficient to further minimize harvesting morbidity.

Adult↗
PubMed1988

Physical activity in postmenopausal women: effect on back muscle strength and bone mineral density of the spine.

In this cross-sectional study, the bone mineral density of the lumbar spine, the back extensor strength, and the level of physical activity were determined in 68 healthy, postmenopausal women. Physical activity was determined by a graded questionnaire and varied from sedentary to heavy vocational and avocational activity levels. Bone mineral density (L2 through L4) was measured with dual-photon absorptiometry. Back extensor strength was determined with use of a strain-gauge dynamometer. Bone mineral density ranged from 0.77 to 1.49g/cm2 (mean +/- SD, 1.06 +/- 0.18g/cm2). Back extensor strength ranged from 37 to 145 lb (84.6 +/- 23.5 lb). Physical activity scores ranged from 3 to 13 (8.0 +/- 2.7). Statistical analysis demonstrated a significant positive correlation (r = 0.34, p less than 0.005) between bone mineral density and back extensor strength. Bone mineral density was also positively correlated with the level of physical activity (r = 0.24, p less than 0.05). There was a significant positive correlation between back extensor strength and level of physical activity (r = 0.37, p less than 0.005). The data suggest that levels of physical activity and back muscle strength may be contributors to the bone mineral density of vertebral bodies.

Aged↗
PubMed2003

Mobility and muscle strength contralateral to hemiplegia from stroke: benefit from self-training with family support.

OBJECTIVE: To determine whether patient exercise with the support of family members maximizes mobility and improves muscle strength in the nonparetic lower limb after stroke. DESIGN: Comparison of improvement at 2 wk between conventional exercise sessions and a program also including the participation of family members. Subjects were 60 patients rendered nonambulatory by severe hemiparesis from their first stroke. Of these, 42 had family members participating in their therapy. Lower limb strength was measured on the nonparetic side using an isokinetic machine. Mobility status was assessed using the Rivermead Mobility Index. Patients were evaluated at the first inpatient gym session and again at 1 and 2 wk. RESULTS: At the first evaluation, lower limb strength and the Rivermead Mobility Index score did not differ between the two groups. Reevaluations were conducted at 1 and 2 wk after the first evaluation. Patients' strength and mobility improved more when family members participated. CONCLUSION: Family participation is an important contributor to stroke rehabilitation.

Aged↗
PubMed2004

Effects of 24 weeks of whole body vibration training on body composition and muscle strength in untrained females.

The aim of this study was to investigate and to compare the effect of 24 weeks "whole body vibration" training and fitness training on body composition and on muscle strength. Forty-eight untrained females (21.3 +/- 2.0 yr) participated in the study. The whole body vibration group (N = 18) performed unloaded static and dynamic exercises on a vibration platform (35 - 40 Hz, 2.5 - 5.0 mm; Power Plate). The fitness group (N = 18) followed a standard cardiovascular (15 - 40 min) and resistance training program including dynamic leg press and leg extension exercises (20 - 8 RM). Both groups trained 3 times weekly. The control group (N = 12) did not participate in any training. Body composition was determined by means of underwater weighing. Additionally 12 skinfolds were assessed. Isometric (0 degrees /s) and isokinetic (50 degrees /s, 100 degrees /s, 150 degrees /s) knee-extensor strength was measured by means of a motor-driven dynamometer (Technogym). Over 24 weeks there were no significant changes (p > 0.05) in weight, in percentage body fat, nor in skinfold thickness in any of the groups. Fat free mass increased significantly in the whole body vibration group (+ 2.2 %) only. A significant strength gain was recorded in the whole body vibration group (24.4 +/- 5.1 %; 5.9 +/- 2.1 %; 8.3 +/- 4.4 %; 7.6 +/- 1.5 %) and in the fitness group (16.5 +/- 1.7 %; 12.0 +/- 2.7 %; 10.4 +/- 2.3 %; 10.2 +/- 1.9 %), at 0 degrees /s, 50 degrees /s, 100 degrees /s and 150 degrees /s respectively. In conclusion, 24 weeks whole body vibration training did not reduce weight, total body fat or subcutaneous fat in previously untrained females. However, whole body vibration training induces a gain in knee-extensor strength combined with a small increase in fat free mass. The gain in strength is comparable to the strength increase following a standard fitness training program consisting of cardiovascular and resistance training.

Adult↗
PubMed1996

Effects of chromium and resistive training on muscle strength and body composition.

Sixteen untrained males (23 +/- 4 yr), were studied to determine the effects of chromium (Cr) supplementation (200 micrograms.d-1) and a 12-wk resistive exercise training program on muscle strength, body composition, and Cr excretion. The subjects trained 3 times per week with two sets of 8-10 repetitions at 90% of 1 repetition maximum using Keiser variable resistance machines. Food records were used to estimate Cr intake (approximately 36 micrograms.d-1), energy intake, and the percent kJ from protein. The resistive training program resulted in significant increases in total body muscular strength in both the Cr and placebo groups (24% and 33%; P < 0.05). Body weight, percent body fat, lean body mass, and skinfold thicknesses were unchanged in either group after resistive training. Cr excretion increased in the Cr group after 6 wk of Cr supplementation (0.15 +/- 0.08 vs 1.52 +/- 1.26 micrograms.d-1; P < 0.01) and remained higher at 12 wk of training (2.03 +/- 1.73). These results indicate that Cr supplementation, in conjunction with a progressive, resistive exercise training program, does not promote a significant increase in strength and lean body mass, or a significant decrease in percent body fat. Cr supplementation results in a significant increase in Cr excretion that is not altered by resistive training.

Adult↗
PubMed2002

Inspiratory muscle strength in chronic obstructive pulmonary disease.

Chronic obstructive pulmonary disease is associated with a functional weakness of the inspiratory muscles. Multiple factors contribute to the decline in functional strength including hyperinflation of the chest, deterioration in nutritional status, and the indirect effects of an exacerbation. The decreased inspiratory muscle strength contributes to sensations of dyspnea and places individuals at risk for respiratory muscle fatigue. The worsening dyspnea causes individuals to reduce their physical activities and ultimately become physically deconditioned. Maximal inspiratory pressure is commonly used to measure functional strength of the inspiratory muscles, and interventions to minimize the extent of decline include inspiratory muscle training, aerobic exercise training, nutritional supplementation, and methods to prevent exacerbations. In the critical care unit, multiple comorbid conditions contribute to further decline in inspiratory muscle strength, making it important to assess respiratory muscle function regularly.

Breathing Exercises↗
PubMedDate not supplied

Mechanical force spinal manipulation increases trunk muscle strength assessed by electromyography: a comparative clinical trial.

OBJECTIVE: The objective of this study was to determine whether mechanical force, manually-assisted (MFMA) spinal manipulative therapy (SMT) affects paraspinal muscle strength as assessed through use of surface electromyography (sEMG). DESIGN: Prospective clinical trial comparing sEMG output in 1 active treatment group and 2 control groups. SETTING: Outpatient chiropractic clinic, Phoenix, AZ. SUBJECTS: Forty subjects with low back pain (LBP) participated in the study. Twenty patients with LBP (9 females and 11 males with a mean age of 35 years and 51 years, respectively) and 20 age- and sex-matched sham-SMT/control LBP subjects (10 females and 10 males with a mean age of 40 years and 52 years, respectively) were assessed. METHODS: Twenty consecutive patients with LBP (SMT treatment group) performed maximum voluntary contraction (MVC) isometric trunk extensions while lying prone on a treatment table. Surface, linear-enveloped sEMG was recorded from the erector spinae musculature at L3 and L5 during a trunk extension procedure. Patients were then assessed through use of the Activator Methods Chiropractic Technique protocol, during which time they were treated through use of MFMA SMT. The MFMA SMT treatment was followed by a dynamic stiffness and algometry assessment, after which a second or post-MVC isometric trunk extension and sEMG assessment were performed. Another 20 consecutive subjects with LBP were assigned to one of two other groups, a sham-SMT group and a control group. The sham-SMT group underwent the same experimental protocol with the exception that the subjects received a sham-MFMA SMT and dynamic stiffness assessment. The control group subjects received no SMT treatment, stiffness assessment, or algometry assessment intervention. Within-group analysis of MVC sEMG output (pre-SMT vs post-SMT sEMG output) and across-group analysis of MVC sEMG output ratio (post-SMT sEMG/pre-SMT sEMG output) during MVC was performed through use of a paired observations t test (POTT) and a robust analysis of variance (RANOVA), respectively. MAIN OUTCOME MEASURES: Surface, linear-enveloped EMG recordings during isometric MVC trunk extension were used as the primary outcome measure. RESULTS: Nineteen of the 20 patients in the SMT treatment group showed a positive increase in sEMG output during MVC (range, -9.7% to 66.8%) after the active MFMA SMT treatment and stiffness assessment. The SMT treatment group showed a significant (POTT, P < 0.001) increase in erector spinae muscle sEMG output (21% increase in comparison with pre-SMT levels) during MVC isometric trunk extension trials. There were no significant changes in pre-SMT vs post-SMT MVC sEMG output for the sham-SMT (5.8% increase) and control (3.9% increase) groups. Moreover, the sEMG output ratio of the SMT treatment group was significantly greater (robust analysis of variance, P = 0.05) than either that of the sham-SMT group or that of the control group. CONCLUSIONS: The results of this preliminary clinical trial demonstrated that MFMA SMT results in a significant increase in sEMG erector spinae isometric MVC muscle output. These findings indicate that altered muscle function may be a potential short-term therapeutic effect of MFMA SMT, and they form a basis for a randomized, controlled clinical trial to further investigate acute and long-term changes in low back function.

Adult↗
PubMed2003

Pulmonary function tests, respiratory muscle strength, and endurance of patients with osteoporosis.

BACKGROUND: It has been shown that patients with thoracic kyphosis due to osteoporosis have diminished pulmonary function. The aim of this study was to determine the pulmonary function, respiratory muscle strength, and endurance of patients with osteoporosis who did not have compression fractures. METHODS: The patient group consisted of 88 recently diagnosed postmenopausal osteoporotic women without spinal fractures. They were matched for age and body mass index with 54 healthy women, who formed the control group. Bone mineral density, pulmonary function test (PFT), maximum voluntary ventilation (MVV), maximal inspiratory pressure (MIP), and maximal expiratory pressure (MEP) measurements of both groups were performed. RESULTS: There were no significant differences between the two groups regarding PFT parameters and MIP and MEP. However, osteoporotic patients had significantly lower MW values. CONCLUSION: Women with postmenopausal osteoporosis without spinal compression fractures have normal PFT, MIP, and MEP values, but they have reduced respiratory muscle endurance.

Aged↗
PubMed2005

[Conservative versus operative treatment after ACL-rupture: influence on the muscle strength capability of the lower extremity].

PURPOSE: In this study two groups of ACL-rupture patients having had a conservative or an operative treatment and a similar rehabilitation were compared regarding their muscle strength capabilities, and the clinical outcome. METHODS: Thirty-three patients (mean age 31 years) were selected according to the Lysholm-scores. Twelve patients were conservatively treated (Group I) and were examined between six and 16 months post trauma. Group II consisted of 21 operatively treated patients which were examined between 6 and 16 months post surgery. All patients underwent a clinical exam following the OAK evaluation form and were tested on a Cybex 6000 isokinetic machine. The subjects had to perform concentric contractions of the extensor and flexor muscles of the knee, hip and ankle at 60 and 120 degrees /s. In addition the knee musculature was isometrically tested at knee angles of 0 and 45 degrees . RESULTS: The clinical examination revealed significant (P < 0.05) differences between groups. The operatively treated patients scored better at the tests for ligamentous stability, whereas the testing of the muscular capabilities revealed significant differences (P < 0.05) favouring the conservatively treated patients in the isokinetic measures, (maximal concentric torque M (max,con)) of the knee extensors, knee flexors, and ankle plantarflexors. CONCLUSION: Whereas the clinical examination only revealed the ligamentous stability to be better results in the operatively treated patients, the conservatively treated patients showed better results in the isokinetik strength measures of the knee extensors, knee flexors, and ankle plantarflexors. The better muscular profiles found for the conservatively treated patients suggest that a better regeneration of the corresponding muscular capabilities after an ACL rupture is possible, provided a specific and controlled rehabilitation program is performed. This seems to be more difficult in operatively treated patients even six to 16 months after the surgical intervention.

Adult↗
PubMed1981

Use and misuse of the tape-measure as a means of assessing muscle strength and power.

The tape-measure is frequently used by the medical profession to assess muscle function following injury. It is assumed that increasing limb girth is reflected by increasing muscle power and strength; but this assumption is empirical and may not in practice be justified. The relationship between thigh circumference and muscle strength and power, measured as the torque produced on an isokinetic dynamometer, was assessed in 64 subjects--24 non-injured sportsmen and 40 injured sportsmen. The correlation between the torque produced at the knee by the knee extensors and flexors and the thigh circumference at three levels was not significant in either group. Comparison of the injured with the non-injured limb also failed to show any correlation. By contrast, in eight subjects, repeated measurements over a six to eight month period showed a significant relationship between change in thigh circumference and change in quadriceps power. It is concluded that a single measurement of circumference at the same point in both thighs of a subject with unilateral injury should not be used as an assessment of muscle function. Serial measurements, however, at the 4 and 10 cm levels may be of value as an index of quadriceps power. Reasons for this are discussed.

Adolescent↗
PubMed2001

The effect of concentric isokinetic strength training of the quadriceps femoris on electromyography and muscle strength in the trained and untrained limb.

The purpose of the present investigation was to examine the effects of unilateral concentric isokinetic leg extension training on peak torque (PT) and electromyographic (EMG) responses in the trained and untrained limbs. Twenty adult men were randomly assigned to a training (TRN, n = 11) or control (CTL, n = 9) group. The TRN group performed 6 sets of 10 leg extensions 3 days per week for 12 weeks at a velocity of 90 degrees.s(-1). All subjects were tested every 4 weeks for PT and EMG responses of both legs at a velocity of 90 degrees.s(-1). The 3-way mixed factorial analysis of variance (ANOVA) indicated a significant (p < 0.05) increase in PT over the 12 weeks in both the trained and untrained limb for the TRN group but no significant change in PT in either limb for the CTL group. The results of the 3-way ANOVA for the EMG data indicated no significant change in EMG amplitude in the trained or untrained limb for the TRN or CTL group. The increase in PT in the absence of a change in EMG may result from hypertrophic factors and/or changes in the other muscles or muscle groups involved in leg extension.

Adaptation, Physiological↗
PubMed1992

Mechanical ankle stabilisation due to the use of orthotic devices and peroneal muscle strength. An experimental investigation.

The mechanical stabilising effect of different orthotic devices and artificially applied muscular strength to the peroneal muscles is tested in cadaveric ankle joints and in vivo. Both orthotic devices as well as muscular strengths of 150 N applied to the peroneal muscles can produce a significant reduction in mechanical ankle instability. However, none of these methods alone can stabilise the ankle joint in such way to completely normalise the talar tilt and anterior drawer sign that is found in stable ankle joints. In contrast to that, clinical results in the treatment of sprained ankles with the application of an orthosis, additional muscular strengthening is the best treatment to achieve a sufficient mechanical ankle stability during the period of ligament healing. Additional factors influencing the mechanical ankle stability are supposed.

Ankle Joint↗
PubMed1988

Objective assessment of muscle strength in chronic relapsing dysimmune polyradiculoneuropathy.

Chronic, relapsing dysimmune polyradiculoneuropathy is an uncommon disease which occasionally affects children. The relapsing-remitting and/or progressive symptoms may be refractory to treatment. Regular, objective assessment of muscle strength, visually displayed, facilitates knowledge of the natural history of the disease and predicts response to treatment, and thus optimum planning for treatment. Myometry, discussed in this report, appears to be an objective and useful technique for this purpose, as illustrated in two teenage girls with this disease.

Adolescent↗
PubMed1986

Serum enzyme, myoglobin and muscle strength relationships in polymyositis and dermatomyositis.

Strength of the quadriceps and hamstring groups was biomechanically assessed in terms of isometric torque production in 14 patients with inflammatory myopathy. Eleven had polymyositis and 3, dermatomyositis. Determinations of serum creatine kinase, lactate dehydrogenase, transaminase, and myoglobin were simultaneously obtained over an average period of observation of 1.8 years. In certain individual patients, there were significant correlations between laboratory indices and strength during the entire course of illness. In others, this was not the case. In the total group of patients, absolute values of the laboratory indices did not correlate well with strength except in the case of serum myoglobin, where there a significant inverse relationship. Logarithmic transformations of the laboratory data increased the inverse correlations. High strength and low myoglobin were related to high prednisone dose. Since laboratory guides are not always related to disease activity, quantitative assessment of muscle strength is necessary.

Adult↗
PubMed2002

Low serum vitamin d does not predict new disability or loss of muscle strength in older women.

OBJECTIVES: To determine whether serum levels of 25-hydroxyvitamin D (25(OH)D) and parathyroid hormone (PTH) predict accelerated decline in muscular strength or onset of new disability in mobility and upper extremity functioning over a 3-year follow-up. DESIGN: A community-based prospective cohort study. PARTICIPANTS: Six hundred twenty-eight moderately to severely disabled women aged 65 and older living in the community. MEASUREMENTS: Subjects were divided into three groups of baseline 25(OH)D serum levels (deficiency: <25 nmol/L; low normal: 25-52 nmol/L; high normal: > or =53 nmol/L) and into tertiles of PTH levels. Objective performance measures (hip flexor, knee extensor, and grip strengths; walking speed; and time for repeated chair stands) and disability in activities involving mobility and upper extremity function were assessed at baseline and every 6 months for 3 years. Decline in performance measures and onset of new disability were compared between 25(OH)D and PTH groups using random effects models and proportional hazards models, respectively, while adjusting for age, race, education, body mass index, baseline performance, and chronic conditions. RESULTS: The annual rate of decline over 3 years in muscular strength, walking speed, and time to perform repeated chair stands was similar across 25(OH)D groups. We observed a nonsignificantly faster decline in proximal muscle strength and walking speed with increasing PTH levels. There was no association for either measure between serum levels and the risk of incident disability in activities relating to mobility and upper extremity function. CONCLUSION: This study does not support the hypothesis that vitamin D deficiency is associated with loss in muscular strength and decline in mobility and upper extremity functioning over time in older women who were moderately to severely disabled at baseline.

Age Factors↗
PubMed1984

Improvement of muscle strength after treatment for hyperparathyroidism.

Severe muscular weakness and increased fatigability are occasionally encountered in patients with hyperparathyroidism (HPT). An unselected series of 15 HPT patients was studied to assess if subjective fitness could be associated with detectable muscular dysfunction at objective measurements comparing muscle strength before and after surgery. Significant increase in isokinetic strength of knee extension and knee flexion at higher angular velocities was found three months after surgery, suggesting effect predominantly on type II (fast twitch) muscle fibres. The results of the study support the clinical impression that HPT surgery may be beneficial to patients with muscular symptoms.

Aged↗