Trunk Muscle Activity During Wheelchair Ramp Ascent and the Influence of a Geared Wheel on the Demands of Postural Control

Howarth SJ, Polgar JM, Dickerson CR, Callaghan JP. Trunk muscle activity during wheelchair ramp ascent and the influence of a geared wheel on the demands of postural control.

Objectives

To quantify levels of torso muscular demand during wheelchair ramp ascent and the ability of a geared wheel to influence trunk muscle activity.

Design

Repeated-measures design. Each participant completed manual wheelchair ramp ascents for each combination of 4 ramp grades (1:12, 1:10, 1:8, and 1:6) and 3 wheel conditions (in gear, out of gear, and a standard spoked wheel) in a block randomized order by wheel condition.

Setting

Biomechanics laboratory.

Participants

Healthy novice wheelchair users (N=13; 6 men) from a university student population.

Interventions

Not applicable.

Main Outcome Measures

Peak electromyographic activity, expressed as a percentage of maximal voluntary isometric contraction (MVIC) of the abdominals, latissimus dorsi, and erector spinae during ramp ascent. Temporal location of peak electromyographic activity (EMG) within a propulsive cycle and integrated electromyographic activity for a single propulsive cycle.

Results

Abdominal peak activity increased 13.9% MVIC while peak posterior trunk muscle activity increased 4.9% MVIC between the shallowest and steepest ramp grades (P<.05). The geared wheel prevented increased peak activity of the rectus abdominis and external oblique (P>.05). Only peak electromyographic timing of the erector spinae was influenced during the push phase by increasing ramp slope.

Conclusions

Increased trunk muscular demand as a result of increasing ramp slope is required to enhance stiffness of the spinal column and provide a stable base during manual propulsion. Manual wheelchair users with compromised activity capacity, compromised abdominal muscle strength, or both, may be able to navigate more difficult terrains while using a geared wheelchair wheel because of reduced demands from the abdominal musculature in the geared wheel condition.     

Differences in Feedforward Trunk Muscle Activity in Subgroups of Patients With Mechanical Low Back Pain

Silfies SP, Mehta R, Smith SS, Karduna AR. Differences in feedforward trunk muscle activity in subgroups of patients with mechanical low back pain.

Objective

To investigate alterations in trunk muscle timing patterns in subgroups of patients with mechanical low back pain (MLBP). Our hypothesis was that subjects with MLBP would demonstrate delayed muscle onset and have fewer muscles functioning in a feedforward manner than the control group. We further hypothesized that we would find differences between subgroups of our patients with MLBP, grouped according to diagnosis (segmental instability and noninstability).

Design

Case-control.

Setting

Laboratory.

Participants

Forty-three patients with chronic MLBP (25 instability, 18 noninstability) and 39 asymptomatic controls.

Interventions

Not applicable.

Main Outcome Measures

Surface electromyography was used to measure onset time of 10 trunk muscles during a self-perturbation task. Trunk muscle onset latency relative to the anterior deltoid was calculated and the number of muscles functioning in feedforward determined.

Results

Activation timing patterns (P<.01; η=.50; 1-β=.99) and number of muscles functioning in feedforward (P=.02; η=.30; 1-β=.83) were statistically different between patients with MLBP and controls. The control group activated the external oblique, lumbar multifidus, and erector spinae muscles in a feedforward manner. The heterogeneous MLBP group did not activate the trunk musculature in feedforward, but responded with significantly delayed activations. MLBP subgroups demonstrated significantly different timing patterns. The noninstability MLBP subgroup activated trunk extensors in a feedforward manner, similar to the control group, but significantly earlier than the instability subgroup.

Conclusions

Lack of feedforward activation of selected trunk musculature in patients with MLBP may result in a period of inefficient muscular stabilization. Activation timing was more impaired in the instability than the noninstability MLBP subgroup. Training specifically for recruitment timing may be an important component of the rehabilitation program.     

Implanted Electrical Stimulation of the Trunk for Seated Postural Stability and Function After Cervical Spinal Cord Injury: A Single Case Study

Triolo RJ, Boggs L, Miller ME, Nemunaitis G, Nagy J, Bailey SN. Implanted electrical stimulation of the trunk for seated postural stability and function after cervical spinal cord injury: a single case study.

Objectives

To explore and quantify the physical and functional effects of stabilizing the torso with electrical stimulation of the paralyzed hip and trunk musculature after motor complete tetraplegia.

Design

Single-subject case study with repeated measures and concurrent controls.

Setting

Academic outpatient rehabilitation center.

Participants

Forty-four-year-old man with C4 American Spinal Injury Association grade A tetraplegia 20 years postspinal cord injury.

Intervention

A surgically implanted multichannel pulse generator and intramuscular stimulating electrodes to activate lumbar erector spinae, quadratus lumborum, and gluteus maximus muscles bilaterally.

Main Outcome Measures

Outcomes assessed with and without stimulation included (1) spinal alignment and pelvic orientation, (2) pulmonary function and ventilatory volumes, (3) forward bimanual reaching distance, (4) seated stability and resistance to externally applied disturbances, (5) maximal force and speed of rowing-like movements, and the ability to (6) independently return to an erect seated position from full forward or lateral flexion and (7) roll in bed without assistance.

Results

Stimulation improved spinal convexity and kyphosis by 26° and 21°, reduced posterior pelvic tilt by 11°, increased forced expiratory volume and vital capacity by 10% and 22%, and improved forward reach by more than 7cm. Average resistance to sagittal disturbances increased by more than 40% (P<.002), and mean force exerted during underhanded pulling more than doubled (P=.014) with stimulation. Restoration of upright sitting in both sagittal and coronal planes and bed turning was made possible through appropriately timed activation of the hip and trunk muscles.

Conclusions

A neuroprosthesis for controlling the paralyzed torso can positively impact spinal alignment, seated posture, pulmonary function, trunk stability, and reach. Stimulation of hip and trunk muscles can improve performance of activities of daily living as well as enable independent wheelchair and bed mobility.     

Trunk Muscle Activation Patterns and Spine Kinematics When Using an Oscillating Blade: Influence of Different Postures and Blade Orientations

Sánchez-Zuriaga D, Vera-Garcia FJ, Moreside JM, McGill SM. Trunk muscle activation patterns and spine kinematics when using an oscillating blade: influence of different postures and blade orientations.

Objective

To compare trunk muscle activation patterns and trunk kinematics when using an oscillating blade in standing and unsupported sitting postures, and with different orientations of the blade.

Design

A cross-sectional survey of trunk muscle activities and lumbar motion.

Setting

Biomechanics research laboratory.

Participants

Healthy men (N=13).

Interventions

An oscillating blade was held with 2 hands and oscillated with vertical and horizontal orientations of blade. These exercises were performed both in an erect standing position and in an erect sitting position.

Main Outcome Measures

Surface electromyography from 14 trunk and 2 shoulder muscles, together with lumbar angular displacement in the 3 planes of motion, were measured while subjects used an oscillating blade at different performance variations. Electromyographic signals were normalized to isometric maximal voluntary contraction (MVC) amplitudes.

Results

With the exception of internal oblique and anterior deltoid for the horizontal condition, and erector spinae at L5 level for the vertical condition, the subject's posture had no effect on trunk muscular recruitment when using the oscillating blade. The vertical blade orientation resulted in higher amplitudes of spine rotation on the horizontal plane and produced the greatest activation levels of the internal oblique (47% MVC), pectoralis major (33% MVC), and external oblique (23% MVC). On the other hand, the horizontal orientation resulted in the greatest activation levels of erector spinae at T9 level (28% MVC), latissimus dorsi (26% MVC), and rectus abdominis (17% MVC).

Conclusions

Muscle activation and spine motion from using an oscillating blade were not affected by the standing or sitting posture of the subject. The choice of blade orientation was more important, because it defined the main group of muscles recruited during the exercise.     

Biochemicals associated with pain and inflammation are elevated in sites near to and remote from active myofascial trigger points

Shah JP, Danoff JV, Desai MJ, Parikh S, Nakamura LY, Phillips TM, Gerber LH. Biochemicals associated with pain and inflammation are elevated in sites near to and remote from active myofascial trigger points.

Objectives

To investigate the biochemical milieu of the upper trapezius muscle in subjects with active, latent, or absent myofascial trigger points (MTPs) and to contrast this with that of the noninvolved gastrocnemius muscle.

Design

We used a microanalytic technique, including needle insertions at standardized locations in subjects identified as active (having neck pain and MTP), latent (no neck pain but with MTP), or normal (no neck pain, no MTP). We followed a predetermined sampling schedule; first in the trapezius muscle and then in normal gastrocnemius muscle, to measure pH, bradykinin, substance P, calcitonin gene-related peptide, tumor necrosis factor alpha, interleukin 1β (IL-1β), IL-6, IL-8, serotonin, and norepinephrine, using immunocapillary electrophoresis and capillary electrochromatography. Pressure algometry was obtained. We compared analyte concentrations among groups with 2-way repeated-measures analysis of variance.

Setting

A biomedical research facility.

Participants

Nine healthy volunteer subjects.

Interventions

Not applicable.

Main Outcome Measures

Preselected analyte concentrations.

Results

Within the trapezius muscle, concentrations for all analytes were higher in active subjects than in latent or normal subjects (P<.002); pH was lower (P<.03). At needle insertion, analyte concentrations in the trapezius for the active group were always higher (pH not different) than concentrations in the gastrocnemius muscle. At all times within the gastrocnemius, the active group had higher concentrations of all analytes than did subjects in the latent and normal groups (P<.05); pH was lower (P<.01).

Conclusions

We have shown the feasibility of continuous, in vivo recovery of small molecules from soft tissue without harmful effects. Subjects with active MTPs in the trapezius muscle have a biochemical milieu of selected inflammatory mediators, neuropeptides, cytokines, and catecholamines different from subjects with latent or absent MTPs in their trapezius. These concentrations also differ quantitatively from a remote, uninvolved site in the gastrocnemius muscle. The milieu of the gastrocnemius in subjects with active MTPs in the trapezius differs from subjects without active MTPs.     

Shoulder load during handcycling at different incline and speed conditions

Background

The manual wheelchair user population experiences a high prevalence of upper-limb injuries, which are related to a high load on the shoulder joint during activities of daily living, such as handrim wheelchair propulsion. An alternative mode of propulsion is handcycling, where lower external forces are suggested to be applied to reach the same power output as in handrim wheelchair propulsion. This study aimed to quantify glenohumeral contact forces and muscle forces during handcycling and compare them to previous results of handrim wheelchair propulsion.

Methods

Ten able-bodied men propelled the handbike on a treadmill at two inclines (1% and 4% with a velocity of 1.66 m/s) and two speed conditions (1.39 and 1.94 m/s with fixed power output). Three-dimensional kinematics and kinetics were obtained and used as input for a musculoskeletal model of the arm and shoulder. Output variables were glenohumeral contact forces and forces of important shoulder muscles.

Findings

The highest mean and peak glenohumeral contact forces occurred at 4% incline (420 N, 890 N respectively). The scapular part of the deltoideus, the triceps and the trapezius produced the highest force.

Interpretation

Due to the circular movement and the continuous force application during handcycling, the glenohumeral contact forces, as well as the muscle forces were clearly lower compared to the results in the existing literature on wheelchair propulsion. These findings prove the assumption that handcycling is mechanically less straining than handrim wheelchair propulsion, which may help preventing overuse to the shoulder complex.     

An investigation of neck muscle activity in asymptomatic participants who show different lumbar spine motion patterns during prone hip extension

Objective

The objective of the current study was to investigate whether any differences exist in the activity of the cervical erector spinae and upper trapezius (TRA) muscles between asymptomatic participants who show “normal” and “abnormal” lumbar spine motion patterns during the prone hip extension (PHE) test.

Methods

Twenty-six asymptomatic participants recruited from a chiropractic college participated in the study. Surface electromyography was used to record the activity of the cervical erector spinae and upper TRA muscles as each participant performed a set of 4 repetitions of PHE for each leg. An examiner observed the participant perform the movement and classified him/her as “positive” or “negative” based on the presence or absence (respectively) of 1 of 3 lumbar spine motion patterns. The mean activity levels of each muscle during the positive sets of PHE were compared with those during the negative sets.

Results

The mean activity of the upper TRA ipsilateral to the side of hip extension was significantly higher in the positive group compared with the negative group (difference, 13.3%; 95% confidence interval, 0.2%-24.4%; P = .0465). No other significant between-group differences were noted.

Conclusion

The results of this study indicate that the presence of abnormal lumbar spine motion patterns during the PHE test may be associated with altered cervicothoracic motor control strategies in asymptomatic individuals. Similar investigations using patients with neck pain are required to comment further on the generalizability and potential clinical importance of these findings.     

Effects of resistance training on lower-extremity impairments in older people with hip fracture

Portegijs E, Kallinen M, Rantanen T, Heinonen A, Sihvonen S, Alen M, Kiviranta I, Sipilä S. Effects of resistance training on lower-extremity impairments in older people with hip fracture.

Objective

To study the effects of resistance training on muscle strength parameters, mobility, and balance.

Design

Randomized controlled trial.

Setting

Research laboratory and senior gym.

Participants

Population-based sample of eligible 60- to 85-year-old community-dwelling men and women 0.5 to 7.0 years after hip fracture. Forty-six people had no contraindications and were willing to participate in the exercise trial.

Intervention

Twelve-week intensive progressive strength-power training (n=24), aiming to reduce asymmetric deficit in leg muscle strength and power, or no intervention (n=22).

Main Outcome Measures

Isometric knee extension torque (KET) and leg extension power (LEP) measured in the weaker and stronger leg and the asymmetric deficit ([weak/sum both legs] × 100%), 10-m walking speed, dynamic balance test, and self-reported outdoor mobility.

Results

KET increased in both legs (P<.021), LEP tended to increase in the weaker leg (P=.071), and asymmetric LEP deficit decreased (P=.010) after training compared with the control group. LEP of the stronger leg, asymmetric KET deficit, walking speed, and balance performance were not significantly affected by training. Self-reported ability to walk outdoors improved after training. The compliance to the training was over 90%, and few adverse events (n=4; mainly musculoskeletal) were likely to be caused by the training.

Conclusions

Intensive resistance training is feasible for people with a hip fracture and improved muscle strength and power. More intensive training especially for the weaker leg may be needed to obtain more marked effects on asymmetric deficit, mobility, and balance. Also, the timing and duration of training program should be considered. (ISRCTN identifier ISRCTN34271567.)     

Electromyography of the Upper Limbs During Computer Work: A Comparison of 2 Wrist Orthoses in Healthy Adults

Ferrigno IS, Cliquet Jr, A, Magna LA, Zoppi Filho A. Electromyography of the upper limbs during computer work: a comparison of 2 wrist orthoses in healthy adults.

Objective

To examine the effect of wrist orthoses on the electromyography activities of the extensor carpi ulnaris, flexor digitorum superficialis, and fibers of the upper trapezius muscles during computer work.

Design

A randomized, 3×2 factorial design: orthoses (no orthosis, wearing a custom-made orthosis, wearing a commercial orthosis) and tasks (typing, using the mouse).

Setting

Laboratory for biomechanics and rehabilitation.

Participants

Healthy university students (N=23), ranging from 18 to 26 years of age.

Intervention

Study volunteers performed standardized tasks such as typing and using the mouse while wearing 1 of 2 types of wrist orthoses or no orthosis.

Main Outcome Measures

We used surface electromyography and considered 100% maximum voluntary contraction to represent the amplitude of electromyographic activity.

Results

We observed a significant increase in the electromyographic activity of the trapezius (P<.05) with the use of orthoses. No significant difference was observed in the activities of the flexor digitorum superficialis or extensor carpi ulnaris in participants who typed with or without orthoses (P>.05). However, when the participants used the mouse, the extensor muscle presented an increase in activity with both orthoses, and the same pattern was observed in the flexor muscle when the volunteers used the custom-made orthosis.

Conclusions

Wrist orthoses affected the muscle activities in the upper limbs of healthy adults who were using a computer. Electromyographic activity increased in the trapezius when the subjects used either type of orthosis, and the same pattern was observed in the extensor carpi ulnaris when the subjects used the mouse. The flexor digitorum superficialis presented an increase in activity only when the subjects worked with the mouse and used a custom-made splint.     

Neuromuscular Electrical Stimulation Training: A Safe and Effective Treatment for Facioscapulohumeral Muscular Dystrophy Patients

Colson SS, Benchortane M, Tanant V, Faghan J-P, Fournier-Mehouas M, Benaïm C, Desnuelle C, Sacconi S. Neuromuscular electrical stimulation training: a safe and effective treatment for facioscapulohumeral muscular dystrophy patients.

Objective

To investigate the feasibility, safety, and effectiveness of neuromuscular electrical stimulation (NMES) strength training in facioscapulohumeral muscular dystrophy (FSHD) patients.

Design

Uncontrolled before-after trial.

Setting

Neuromuscular disease center in a university hospital and a private-practice physical therapy office.

Participants

FSHD patients (N=9; 3 women, 6 men; age 55.2±10.4y) clinically characterized by shoulder girdle and quadriceps femoris muscle weakness.

Interventions

Patients underwent 5 months of strength training with NMES bilaterally applied to the deltoideus, trapezius transversalis, vastus lateralis, and vastus medialis muscles for five 20-minute sessions per week.

Main Outcome Measures

Plasma creatine kinase (CK) activity; scores for pain and fatigue on visual analog scales (VAS), manual muscle testing (MMT), maximal voluntary isometric contraction (MVIC), 6-minute walking tests (6MWT), and self-reported changes in daily living activities.

Results

NMES strength training was well tolerated (CK activity and pain and fatigue scores on VAS were not modified). Most of the muscle functions (shoulder flexion and extension and knee extension) assessed by MMT were significantly increased. MVIC of shoulder flexion and abduction and the 6MWT distance were also improved.

Conclusions

In FSHD, NMES strength training appears to be safe with positive effects on muscle function, strength, and capacity for daily activities.     

Comparing the survival between extracorporeal rescue and conventional resuscitation in adult in-hospital cardiac arrests: Propensity analysis of three-year data

Aim

Extracorporeal cardiopulmonary resuscitation (ECPR) has been shown to have survival benefit over conventional CPR (CCPR) in patients with in-hospital cardiac arrest of cardiac origin. We compared the survival of patients who had return of spontaneous beating (ROSB) after ECPR with the survival of those who had return of spontaneous circulation (ROSC) after conventional CPR.

Methods

Propensity score-matched cohort of adults with in-hospital prolonged CPR (>10 min) of cardiac origin in a university-affiliated tertiary extracorporeal resuscitation center were included in this study. Fifty-nine patients with ROSB after ECPR and 63 patients with sustained ROSC by CCPR were analyzed. Main outcome measures were survival at hospital discharge, 30 days, 6 months, and one year, and neurological outcome.

Results

There was no statistical difference in survival to discharge (29.1% of ECPR responders vs. 22.2% of CCPR responders, p = 0.394) and neurological outcome at discharge and one year later. In the propensity score-matched groups, 9 out of 27 ECPR patients survived to one month (33.3%) and 7 out of 27 CCPR patients survived (25.9%). Survival analysis showed no survival difference (HR: 0.856, p = 0.634, 95% CI: 0.453-1.620) between the groups, either at 30 days or at the end of one year (HR: 0.602, p = 0.093, 95% CI: 0.333-1.088).

Conclusions

This study failed to demonstrate a survival difference between patients who had ROSB after institution of ECMO and those who had ROSC after conventional CPR. Further studies evaluating the role of ECMO in conventional CPR rescued patients are warranted.     

Remote Influences of Acupuncture on the Pain Intensity and the Amplitude Changes of Endplate Noise in the Myofascial Trigger Point of the Upper Trapezius Muscle

Chou L-W, Hsieh Y-L, Kao M-J, Hong C-Z. Remote influences of acupuncture on the pain intensity and the amplitude changes of endplate noise in the myofascial trigger point of the upper trapezius muscle.

Objective

To investigate the remote effect of acupuncture on the pain intensity and the endplate noise (EPN) recorded from a myofascial trigger point (MTrP) of the upper trapezius muscle.

Design

Randomized controlled trial.

Setting

University hospital.

Participants

Patients (N=20) with active MTrPs in upper trapezius muscles and no experience in acupuncture therapy.

Interventions

Patients were divided into 2 groups. Those in the control group received sham acupuncture, and those in the acupuncture group received modified acupuncture therapy with needle insertion into multiple loci to elicit local twitch responses. The acupuncture points of Wai-guan and Qu-chi were treated.

Main Outcome Measures

Subjective pain intensity (numerical pain rating scale) and mean EPN amplitude in the MTrP of the upper trapezius muscle.

Results

The pain intensity in the MTrP was significantly reduced after remote acupuncture (from 7.4±0.8 to 3.3±1.1; P<.001), but not after sham acupuncture (from 7.4±0.8 to 7.1±0.9; P>.05). The mean EPN amplitude was significantly lower than the pretreatment level after acupuncture treatment (from 21.3±9.5μV to 9.5±3.5μV; P<.01), but not after sham acupuncture treatment (from 19.6±7.6μV to 19.3±7.8μV; P>.05). The change in the pain intensity was significantly correlated with the change of EPN amplitude (r = 0.685).

Conclusions

Both subjective changes in the pain intensity and objective changes of the EPN amplitude in the MTrP region of the upper trapezius muscle were found during and after acupuncture treatment at the remote ipsilateral acupuncture points. This study may further clarify the physiological basis of the remote effectiveness of acupuncture therapy for pain control.     

The impact of backboard size and orientation on sternum-to-spine compression depth and compression stiffness in a manikin study of CPR using two mattress types

Objectives

To explore how backboard orientation and size impact chest compressions during cardiopulmonary resuscitation (CPR).

Methods

Experiments were conducted on a full-body CPR training manikin using a custom-built simulator. Two backboards of different sizes were tested in longitudinal (head to toe) and latitudinal (side to side) directions to assess the impact of size and orientation on chest compressions during CPR. The net sternum-to-spine displacement, combined mattress and sternal displacement as well as the axial reaction force were measured during each test.

Results

The difference in net compression depth between the larger and smaller backboards ranged between 0.08 ± 0.30 cm and 1.47 ± 0.13 cm, while the difference in back support stiffness varied between 103.7 ± 211 N/cm and 688.1 ± 180.3 N/cm. The difference in net compression depth between the longitudinal and latitudinal backboard orientations ranged from 0.07 ± 0.32 cm to 0.34 ± 0.18 cm, while for the back support stiffness the difference was between 13.4 ± 50.0 N/cm and 592.2 ± 211.0 N/cm.

Conclusions

The effect of backboard size on chest compression (CC) performance during CPR was found to be significant with the larger backboard producing deeper chest compressions and higher back support stiffness than the smaller backboard. The impact of backboard orientation was found to depend on the size of the backboard and type of mattress used. Clinicians should be aware that although a smaller backboard may be easier for rescuers to manipulate, it does not provide as effective back support or produce as deep chest compressions as a larger backboard.     

Feasibility of treatment of lower limb edema with calf muscle pump stimulation in chronic heart failure

Background

Persons with chronic heart failure may exhibit a decrease in functional ability related to lower extremity edema in spite of optimal diuretic therapy and salt restrictions.

Aim

The aim of this pilot prospective clinical study was to test the feasibility of using exogenous calf muscle pump stimulation to decrease lower leg edema and thus improve functional status and quality of life.

Methods

Six subjects entered into this study and agreed to use the intervention 30 min/day for one month. DXA was used to assess lower extremity composition.

Results

Device use averaged approximately 1 h/day and resulted in a reduction in the lean mass of the legs of 0.5 kg (range = 0.08-1.0 L; p = 0.03). Linear regression analysis of reduction of lower limb edema against daily usage suggests that increased utilization of calf muscle pump stimulation was associated with increased water losses, although this trend was not significant (R² = 0.4, p = 0.18).

Conclusion

This pilot indicates that exogenous calf muscle pump stimulation could be a useful and safe addition to the patients' treatment regimes, but further studies testing a more typical population with heart failure is warranted.     

The clinical learning environment and supervision instrument (CLES): validity and reliability of the Dutch version (CLES+NL)

Background

The clinical learning environment and supervision scale (CLES) is a valid and reliable tool that was developed to assess the quality of nursing students’ clinical placements.

Objectives

To obtain a reliable and valid Dutch version of the CLES that is in line with the Flemish culture and educational context.

Design

Scale validation study on data provided by a cross-sectional survey.

Settings

190 wards in 31 institutions for healthcare in Flanders, Belgium.

Participants

768 student nurses enrolled in the 3 year bachelor programme at University College Ghent, Faculty of Healthcare Vesalius.

Methods

Face and content validation was followed by data collection. Factor analysis was performed using varimax rotation. Subsequently, internal consistency reliability was tested on the total scale and its subdimensions using Cronbach's alpha.

Results

We gathered 768 questionnaires. Factor analysis revealed 5 subdimensions with an eigenvalue greater than 1, explaining 71.281% of the variance. The overall internal consistency and the consistency of the five subdimensions is high. Our data supports face, content and construct validity of the CLES + NL.

Conclusions

The CLES + NL is a valid and reliable instrument that can be used to evaluate the quality of nursing wards as learning environments in Flanders.     

The supine hip extensor manual muscle test: a reliability and validity study

Perry J, Weiss WB, Burnfield JM, Gronley JK. The supine hip extensor manual muscle test: a reliability and validity study. Arch Phys Med Rehabil 2004;85:1345-50.

Objectives

To define the relative hip extensor muscle strengths values identified by the 4 grades obtained with a supine manual muscle test (MMT) and to compare these values with those indicated by the traditional prone test.

Design

Comparison of 4 manual supine strength grades with isometric hip extension joint torque; κ statistic-determined interrater reliability, and analyses of variance identified between grade differences in torque.

Setting

Pathokinesiology laboratory.

Participants

Adult volunteers recruited from local community and outpatient clinics. Reliability testing: 16 adults with postpolio (31 limbs). Validity testing (2 groups): 18 subjects without pathology (18 limbs), and 26 people with clinical signs of hip extensor weakness (51 limbs).

Interventions

Not applicable.

Main Outcome Measures

Supine hip extensor manual muscle grade and isometric hip extension torque.

Results

Reliability testing showed excellent agreement (82%). Subjects with pathology had significant differences in mean torque (P<.01) for the assigned grade 5 (176Nm), grade 4 (103Nm), grade 3 (67Nm), and grade 2 (19Nm). Healthy adults showed significant differences between grade 5 (212Nm) and grade 4 (120Nm) in mean torque (P<.05).

Conclusions

The supine MMT is a reliable and valid method with which to assess hip extension strength.     

Evolution of somatosensory evoked potentials after cardiac arrest induced hypoxic-ischemic injury

Aim

We tested the hypothesis that early recovery of cortical SEP would be associated with milder hypoxic-ischemic injury and better outcome after resuscitation from CA.

Methods

Sixteen adult male Wistar rats were subjected to asphyxial cardiac arrest. Half underwent 7 min of asphyxia (Group CA7) and half underwent 9 min (Group CA9). Continuous SEPs from median nerve stimulation were recorded from these rats for 4 h immediately following CA, and at 24, 48, and 72 h. Clinical recovery was evaluated using the Neurologic Deficit Scale.

Results

All rats in group CA7 survived to 72 h, while only 50% of rats in group CA9 survived to that time. Mean NDS values in the CA7 group at 24, 48, and 72 h after CA were significantly higher than those of CA9. The N10 (first negative potential at 10 ms) amplitude was significantly lower within 1 h after CA in rats that suffered longer CA durations. SEPs were also analyzed by separating the rats into good (NDS ≥ 50) vs. bad (NDS < 50) outcomes at 72 h, again showing significant difference in N10 and peak-to-peak amplitudes between the two groups. In addition, a smaller N7 potential was consistently observed to recover earlier in all rats.

Conclusions

The diminished recovery of N10 is associated with longer CA times in rats. Higher N10 and peak-to-peak amplitudes during early recovery are associated with better neurologic outcomes. N7, which may represent thalamic activity, recovers much earlier than cortical responses (N10), suggesting failure of thalamocortical conduction during early recovery.     

Scapular Muscle Activity in Overhead Athletes With Symptoms of Secondary Shoulder Impingement During Closed Chain Exercises

Tucker WS, Armstrong CW, Gribble PA, Timmons MK, Yeasting RA. Scapular muscle activity in overhead athletes with symptoms of secondary shoulder impingement during closed chain exercises.

Objective

To determine the amount of muscle activation in 4 scapular muscles in overhead athletes with and without a history of secondary shoulder impingement, during 3 upper extremity closed chain exercises.

Design

One-between (group), one-within (exercise) repeated measures.

Setting

Controlled laboratory study.

Participants

Overhead athletes (n=15; mean age ± SD, 21.0±2.5y; mean height ± SD, 176.0±7.8cm; mean weight ± SD, 76.1±13.4kg) demonstrating with symptoms of shoulder impingement and overhead athletes (n=15; mean age ± SD, 20.4±3.8y; mean height ± SD, 174.1±9.7cm; mean weight ± SD, 73.3±11.7kg) with no shoulder pathologies.

Interventions

Subjects completed 5 individual trials of a standard push-up, a push-up on an unstable surface, and a revolution on a shoulder rehabilitation device while electromyography (EMG) recorded muscle activity of the serratus anterior, upper trapezius, middle trapezius, and lower trapezius.

Main Outcome Measures

The mean EMG data for the 4 muscles from the standard push-up, push-up on an unstable surface, and shoulder rehabilitation device trials were normalized as a percentage of a maximum voluntary isometric contraction for each muscle.

Results

There was a statistically significant interaction for the middle trapezius (F_2,56=3.856; P=.027). The shoulder impingement push-up on an unstable surface (33.76%±26.45%) had significantly greater activation compared with the shoulder impingement standard push-up (25.88%±13.76%), the shoulder impingement shoulder rehabilitation device (9.40%±5.86%), and the nonpathology push-up on an unstable surface (19.49%±7.73%). The shoulder impingement standard push-up had significantly greater activation compared with the shoulder impingement shoulder rehabilitation device and nonpathology standard push-up (17.99%±7.31%). The nonpathology standard push-up and nonpathology push-up on an unstable surface had significantly greater activation compared with the nonpathology shoulder rehabilitation device (7.95%±4.30%).

Conclusions

These results suggest that the muscle activation of the middle trapezius differs in overhead athletes with a history of secondary shoulder impingement compared with those who lack this history during closed chain exercise, as well as within the 3 closed chain exercises. The levels of muscle activation of the serratus anterior and upper trapezius during these closed chain exercises were similar between the 2 groups. These results support the use of closed chain exercises in the rehabilitation process of overhead athletes with secondary shoulder impingement. However, clinicians should consider the muscle(s) of interest when selecting an exercise.     

Effects of concurrent strength and endurance training on physical fitness and symptoms in postmenopausal women with fibromyalgia: a randomized controlled trial

Valkeinen H, Alén M, Häkkinen A, Hannonen P, Kukkonen-Harjula K, Häkkinen K. Effects of concurrent strength and endurance training on physical fitness and symptoms in postmenopausal women with fibromyalgia: a randomized controlled trial.

Objective

To examine the effectiveness of concurrent strength and endurance training on muscle strength, aerobic and functional performance, and symptoms in postmenopausal women with fibromyalgia (FM).

Design

Randomized controlled trial.

Setting

Local gym and university research laboratory.

Participants

Twenty-six women with FM.

Intervention

Progressive and supervised 21-week concurrent strength and endurance training.

Main Outcome Measures

Muscle strength of leg extensors, upper extremities, and trunk; peak oxygen uptake (Vo₂peak), maximal workload (Wmax), and work time; 10-m walking and 10-step stair-climbing time and self-reported functional capacity (Health Assessment Questionnaire); and symptoms of FM.

Results

After concurrent strength and endurance training, the groups differed significantly in Wmax (P=.001), work time (P=.001), concentric leg extension force (P=.043), walking (P=.001) and stair-climbing (P<.001) time, and fatigue (P=.038). The training led to an increase of 10% (P=.004) in Wmax and 13% (P=.004) in work time on the bicycle but no change in Vo₂peak.

Conclusions

Concurrent strength and endurance training in low to moderate volume improves the muscle strength of leg extensors, Wmax, work time, and functional performance as well as perceived symptoms, fatigue in particular. Concurrent strength and endurance training is beneficial to postmenopausal women with FM without adversities, but more extensive studies are needed to confirm the results.