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Biomechanical evaluation of lift postures in adult Koli female labourers.

Three lift-postures, back straight and knees bent, back bent and knees straight and squatting were evaluated biomechanically based on data from 100 Koli female labourers, when lifting loads from the floor to hold them at knee height. The maximum weight was lifted with the back bent and the knees straight which is a posture commonly used by Indian labourers for lifting a load. Squatting (a posture used by Indians for performing household chores) produced the least physical strain in terms of moment and moment ratio (moment per kilogramme of load lifted). Consequently, squatting was found to be the best posture for lifting a load, specifically for the Indian labourers who are accustomed to squatting when working.

Adult↗

Discriminability of load heaviness: implications for the psychophysical approach to manual lifting.

The main objective of this study was to investigate human ability to discriminate between different levels of load heaviness in manual lifting. Twelve male college students participated in the laboratory experiment. Twenty-eight sequences of five boxes that weighed from 5 to 64 lbs (2.27-29.1 kg) were used. The subjects were asked to arrange boxes in each sequence in order of the perceived (increasing or decreasing) heaviness, i.e., from lightest to the heaviest box, or from heaviest to the lightest box. The subjects were also asked to assign linguistic descriptors of perceived load heaviness to each box in the sequence, and to indicate the confidence levels regarding correctness of the assigned box order and assignment of linguistic values. The independent variables included magnitude of weight and load differential between the successive weights in a sequence. The number of sequential ordering errors, assignment of linguistic variables, and estimated confidence levels were highly dependent on the load differential and weight range. It was concluded that in order to assure reliable results of the psychophysical approach to determining the values of maximum acceptable weight of lift, the adjustment process for male subjects should require using small weights of at least 4 lbs (1.8 kg) to be added or removed from the lifted box. The results of this study also suggest that the error rate in load discriminability can be controlled below the 10% level, if the relative difference in weight between successive boxes lifted is at least 12%. Given the above findings, it is suggested that usefulness of some of the recommendations for setting safe limits for manual lifting tasks, which were reached based on the psychophysical approach and broadly reported in the past, may need to be carefully re-examined. Finally, this study showed that the Weber fraction for load heaviness over the range of lifted weights from 8.6 to 29.1 kg is between 0.03 and 0.04.

Biomechanical Phenomena↗

Shrinkage and psychophysical load ratings in self-paced and force-paced lifting work and during recovery.

The purpose of this study was to investigate the effects of the load on the human spine during force-paced and self-paced lifting and subsequent rest. Five women and five men worked under self-paced and force-paced (4 lifts/min) conditions on two days lifting a box for 30 min. The weight of the box was determined by the rating of acceptable load (RAL) method. During the work the lift rate was observed, and subjects made rating of perceived exertion (RPE) in 5 min intervals. The stature was measured with a staturemeter before and after the work period and during the following 30 min rest lying. In self-paced work women had a higher lift rate than men (p less than 0.05). In general, RPEs increased towards the end of the lifting period but RPEs did not differ between women and men or between self-paced and force-paced work. The mean shrinkage during the 30 min work was in self-paced work 5.1 +/- 2.0 mm for women and 5.8 +/- 1.2 mm for men, and in force-paced work 5.8 +/- 2.3 mm and 6.8 +/- 2.2 mm, respectively. There were no significant differences in shrinkage at work between women and men nor between the two different pacing methods. During the 30 min rest recumbent the subjects regained almost the same amount of height as they had lost during lifting. The rapid shrinkage and recovery when loading and unloading suggest that a few minutes rest lying after heavy activities would be beneficial for the spine.

Adult↗

Effect of task variables and their interactions in lifting and lowering loads.

An experiment was designed to study the effect of several task variables on the metabolic energy expenditure and heart rate of individuals performing lifting and lowering tasks. The task variables studied were: load of lift (lower), frequency of lift (lower), height of lift (lower), presence of absence of handles, container height, container width (in the frontal plane) and container length (in the sagittal plane). Four male subjects participated in the experiment. Their oxygen uptake and heart rate were monitored. Various strength measurements were made on the subjects before their participation in the study and after the study was over. The data were analyzed separately for lifting and lowering, using the analysis of variance. Container height did not affect the metabolic energy expenditure or heart rate of the subjects for lifting or lowering activities. Presence or absence of handles did not cause a significant change (alpha greater than or equal to .10) in the physiological responses for lowering tasks. All other task variable effects, however, were significant (alpha less than or equal to .01). A strong first and second order interaction was observed among the task variables. There was a significant increase in the strength (alpha less than or equal to .025) of subjects after performing manual materials handling activities for about seven weeks. A dimensional sensitivity analysis indicated that unit change in box width was more expensive than unit change in box length up to .56 m (22 inches). Beyond this, unit change in box length became critical. The weight/bulk ratio of the object did not affect the physiological responses.

Adolescent↗

Risk factors for work-related low back pain in registered nurses, and potential obstacles in using mechanical lifting devices.

Back pain disability is a serious and costly problem affecting the nursing profession. The purposes of this study were to determine risk factors for work-related low back pain (WRLBP) in registered nurses and to record the reported use or reasons for nonuse of mechanical lifts. Our hypothesis was that workers who attributed the cause of WRLBP to their own actions would be knowledgeable about back safety, would be more likely to use lifts, and would report less WRLBP. A random sample of 270 registered nurses was selected from two acute care hospitals in central Illinois to identify WRLBP risk factors. This cross-sectional study gathered information on individual, physical workload, psychological, and organizational factors that may present a risk for WRLBP. Information was also collected on the use of safety devices and back pain symptoms. The response rate was 50.4%. Nearly 84% of respondents had WRLBP in the past, and 36.2% had WRLBP in the past year that limited movement or interfered with routine activities. Among the risk factors significantly associated with WRLBP were more years worked in nursing, frequent lifting, and low social support. Only 11% reported that they routinely used mechanical lifting devices, and the primary reason given for failure to use lifting equipment was unavailability of equipment. The reasons for the lack of use of mechanical lifts should be investigated and addressed.

Adult↗

Conventional pneumoperitoneum compared with abdominal wall lift for laparoscopic cholecystectomy.

We have compared, in a randomized study, conventional carbon dioxide pneumoperitoneum with abdominal wall lift in 25 patients undergoing laparoscopic cholecystectomy. Intra-abdominal pressure (IAP) (11 (SD 2) mm Hg vs 2.7 (9) mm Hg) (P < 0.01) and total amount of carbon dioxide used (40 (23) litre vs 9 (7) litre) (P < 0.001) were significantly less with abdominal wall lift. Pulmonary compliance was significantly greater (P < 0.01) in the abdominal wall lift group throughout operation. During the first 15 min of insufflation, arterial pressures were lower with abdominal wall lift (P < 0.05). In the conventional pneumoperitoneum group, femoral vein pressure increased (P < 0.01) and remained elevated for 3 h in the recovery room. Postoperative drowsiness was of significantly longer duration in the conventional pneumoperitoneum group than in the abdominal wall lift group (98 (46) min vs 13 (34) min) (P < 0.01). Postoperative nausea and vomiting and right shoulder pain occurred more often in patients with conventional pneumoperitoneum (P < 0.05). We conclude that the benefits of abdominal wall lift may be attributed to avoiding excessive carbon dioxide and high IAP.

Abdominal Muscles↗

Impaired grip-lift synergy in children with unilateral brain lesions.

Children with spastic hemiplegia have impaired dexterity in the affected extremity. The purpose of the present study was to investigate whether the force co-ordination pattern during precision grip in 13 children between 4 and 10 years of age with predominant unilateral brain lesions is related to manual dexterity and to the location and size of the brain lesion. The force co-ordination pattern was investigated by means of a specially designed object that monitored the isometric fingertip forces applied to the contact surfaces during precision grip. Hand function was measured by means of neurological examination, functional hand-grips and dexterity. Brain lesions were identified by series of ultrasound and MRI scans. Normally, the fingertip forces are applied to the object in the initial phase of the lift in an invariant force co-ordination pattern (i.e. grip-lift synergy), in which the grip and load forces are initiated simultaneously and increase in parallel with unimodal force rate trajectories. A majority of children with unilateral brain lesions had not developed the force co-ordination pattern typical for their age, but produced an immature or a pathological pattern. The developmental level of the grip-lift synergy was determined and quantified according to criteria derived from earlier studies on normally developed children. There was a clear relationship between the developmental level of the grip-lift synergy and impaired dexterity, indicating that proper development of the force co-ordination pattern is important for skilled hand function. The grip-lift synergy correlated with the total extent of lesions in the contralateral cortex and white matter and with lesions in the thalamus/basal ganglia, while no correlation was found for isolated cortical lesions. The results suggest that the neural circuits involved in the control of the precision grip are organized in a parallel and distributed system in the hemispheres, and that the basal ganglia are important during the formation of these circuits. Perinatal lesions in specific cortical motor areas may be compensated for by circuits elsewhere in the grip-lift motor system, while large lesions exclude this possibility.

Brain↗

Effect of heel lifts on ground reaction force patterns in subjects with structural leg-length discrepancies.

The purpose of this study was to determine the effect of heel lifts on ground reaction force patterns in subjects with structural leg-length discrepancies (LLDs). Eighteen subjects with LLDs ranging from 4.8 to 22.2 mm participated in this study. Subject age range was from 20 to 63 years. A force platform was used to obtain ground reaction force data for four conditions. Data were collected prior to fitting of the heel lift and after a three-week break-in period. Data were analyzed by use of a two-factor within-subject analysis of variance for repeated measures. Before heel-lift fitting, maximum lateral force was greater in the short leg than in the long leg. After heel-lift fitting, maximum vertical force was greater within both legs, and maximum medical force was greater in the long leg than in the short leg. The results suggest that although heel lifts are used to achieve pelvic levelness, the use of heel lifts also resulted in increased ground reaction forces, which may cause increased joint stresses within the lower extremities.

Adult↗

Effect of combined mouth closure and chin lift on upper airway dimensions during routine magnetic resonance imaging in pediatric patients sedated with propofol.

BACKGROUND: In pediatric patients, obstruction of the upper airway is a common problem during general anesthesia. Chin lift is a commonly used technique to improve upper airway patency. However, little is known about the mechanism underlying this technique. METHODS: The authors studied the effect of the chin lift maneuver on airway dimensions in 10 spontaneously breathing children (aged 2-11 yr) sedated with propofol during routine magnetic resonance imaging. The minimal anteroposterior and corresponding transverse diameters of the pharynx were determined at the levels of the soft palate, dorsum of the tongue, and tip of the epiglottis before and during the chin lift maneuver. Additionally, cross-sectional areas were calculated at these sites, including tracheal areas 2 cm below the glottic level. RESULTS: Minimal anteroposterior diameter of the pharynx increased significantly during chin lift at all three levels in all patients. The diameters of the soft palate, tongue, and epiglottis increased from 6.7+/-2.8 mm (SD) to 9.9+/-3.6 mm, from 9.6+/-3.6 mm to 16.5+/-3.1 mm, and from 4.6+/-2.5 mm to 13.1+/-2.8 mm, respectively. The corresponding transverse diameter of the pharynx also increased significantly at all three levels in all patients but without significant predominance. The diameters at the levels of the soft palate, tongue, and epiglottis increased from 15.8+/-5.1 mm to 22.8+/-4.5 mm, from 13.5+/-4.9 mm to 18.7+/-5.3 mm, and from 17.2+/-3.9 mm to 21.2+/-3.7 mm, respectively. Cross-sectional pharyngeal areas increased significantly at all levels (soft palate, from 0.88+/-0.58 cm2 to 1.79+/-0.82 cm2; tongue, from 1.15+/-0.45 cm2 to 2.99+/-1.30 cm2; epiglottis, from 1.17+/-0.70 cm2 to 3.04+/-0.99 cm2), including the subglottic level (from 0.44+/-0.15 cm2 to 0.50+/-0.14 cm2). CONCLUSIONS: This study shows that all children had a preserved upper airway at all measured sites during propofol sedation. Chin lift caused a widening of the entire pharyngeal airway that was most pronounced between the tip of the epiglottis and the posterior pharyngeal wall. In pediatric patients, chin lift may be used as a standard procedure during propofol sedation.

Child↗

Validating a "pillar and collar" technique for measuring the edge lift of rigid contact lenses.

PURPOSE: The clinical importance of the edge lift of rigid contact lenses is often neglected, possibly due to previous difficulties in its measurement. A new method of measuring axial edge lift (AEL) and radial edge lift (REL) using standard contact lens verification equipment, such as an optical spherometer, a thickness gauge, and contact lens V gauge, is described. METHODS: The technique was validated for trueness (accuracy) and precision (repeatability) by measuring the edge lift of a number of monocurve lenses, manufactured both with and without a normal edge finish. RESULTS: Edge lift was measured to an accuracy of 0.01 mm. CONCLUSIONS: As long as a mean of eight independent measurements of back optic zone radius (BOZR), sagitta, and one measurement of center thickness are taken, the pillar and collar technique is capable of producing accurate and repeatable measurements of the edge lift of a rigid contact lens.

Contact Lenses↗

Simultaneous face lifting and skin resurfacing.

Although face lifting and skin resurfacing both produce dramatic facial rejuvenations, the simultaneous combination has never been popularized. The development of new methods of lifting and resurfacing may now allow a reevaluation of this combination. The objective was to evaluate the safety and efficacy of this combined face lift and skin resurfacing. The facial skin was resurfaced with a trichloroacetic acid peel or a "short-pulse" CO2 laser and, then, lifted after liposuction and superficial musculoaponeurotic system tightening. A dramatic rejuvenation was produced in these 25 cases. There were no incidents of persistent erythema, pigmentation, hyperpigmentation, or full-thickness flap necrosis. Side effects were the usual sequelae of edema and ecchymoses. The small areas of "dusky" erythema of the skin flaps were no more significant than those after a face lift alone. By following the guidelines developed in this report, the combination of controlled skin resurfacing with face lifting is safe and effective. Other procedures, such as blepharoplasties, can also be added. After one recovery period of 6 to 8 weeks, these patients reported that they looked 15 to 20 years younger. The complexion continued to improve during the 1-year follow-up period.

Adult↗

Face lift and hair transplantation as a single procedure.

Frequently, when a face lift procedure is performed, several pieces of healthy scalp are discarded as waste unless a prehairline incision is used. In selected cases, such as patients with hair loss, these pieces of scalp may be used to create micrografts (grafts with 1 to 2 hairs) and minigrafts (grafts with 3 to 4 hairs) and transplanted to the areas of need in the same session. I have found particularly rewarding the combination of face lift and hair transplantation, because patients who need both procedures benefit immensely by doing them together. This way, the pieces of healthy scalp that normally would have gone to waste are recycled. In a preliminary fashion, a strip of retroauricular and occipital scalp that normally would be discarded is harvested from one side and handed to my assistants. Under magnification, they dissect it into micrografts and minigrafts as I do the face lift on that side. When I go to the second side of the face lift, I give them the other strip of scalp; again, as they dissect it into grafts, I continue with the face lift. Usually, we generate about 1000 micrografts and minigrafts from those strips that would have normally been discarded. If I want more grafts, I would (in a preliminary fashion) harvest the donor strip of the size required. As the face lift with or without eyelids is completed, we usually have the grafts ready for insertion. Today, we are able to transplant approximately 1000 grafts in about 1 hour. Therefore, combining the two procedures adds only about an hour to our surgical and anesthesia time.

Combined Modality Therapy↗

Endoscopic foreheadplasty: a histologic comparison of periosteal refixation after endoscopic versus bicoronal lift.

Endoscopic brow lift techniques using temporary fixation rely on rapid readherence of the periosteum to calvarial bone. Little is known about the histologic events that occur during the early postoperative period after these procedures. An animal study was designed to compare and contrast periosteal fixation to bone and unelevated periosteum, with endoscopic and bicoronal brow lift techniques. One method of temporary fixation is the use of absorbable (polylactic/polyglycolic acid copolymer) LactoSorb screws; a histologic analysis of implanted LactoSorb screws was also performed. Sixteen rabbits underwent brow lifts; eight underwent endoscopic brow lift and fixation with LactoSorb screws without skin excision, and another eight underwent traditional bicoronal brow lift with skin excision and closure under tension. Animals were killed 1, 2, 6, and 12 weeks after the procedures were performed to evaluate the interaction of periosteum and bone and the normal, unelevated periosteum/calvarium interface at a site distant from the operative area. Histologic specimens were examined for the degree of apposition of periosteum to bone and for any fibrous or bony reaction at this interface. Histologic analysis showed various degrees of periosteal fibrosis and fixation to calvarial bone. After an initial phase of minimal periosteal adherence and moderate inflammation, the periosteum became progressively more adherent to bone in both groups, with no significant differences between treatment groups in rates of fixation. Fixation required at least 6 weeks. LactoSorb screws were surrounded by an area of mild inflammation and were progressively hydrolyzed and digested. Periosteal fixation increases over time for bicoronal and endoscopic brow lifts with minimal differences between the two techniques. With this animal model, periosteal adherence to calvarium requires at least 6 weeks with complete adherence by 12 weeks. In addition, the use of absorbable fixation screws seems to be both effective and well tolerated. The histologic changes associated with periosteal healing observed in this study suggest that permanent or semipermanent fixation may improve the accuracy and early postoperative maintenance of forehead advancement.

Absorption↗

Personal experiences and algorithm of endoscopically assisted subperiosteal face lift in orientals for 5 years.

Orientals are anatomically distinct from Caucasians and are characterized by a thick dermis, a Mongoloid slant of the palpebral fissure, a relatively prominent zygoma and mandible angle, and a relatively flat nose. Given these characteristics, it was believed that the subperiosteal face lift was not suitable for Orientals. However, at our institution, endoscopically assisted subperiosteal face lifts were performed from May of 1994 to October of 1998 on 236 patients; variable pitfalls, as well as satisfying results, were reported. Patient ages ranged from 29 to 66 years (mean age, 55.2 years), and follow-up ranged from 6 to 44 months (mean follow-up, 23 months). All forehead and brow lifts were performed using an endoscopic guide, and routine corrugator resections and procerus myotomies were performed. Three slanted cortical tunnels were made at the corresponding locations on the outer table of the calvarium, and 1-0 nylon or screw suspension and fixation were performed after a 1-cm to 2-cm lift. Midface lifts were performed through lower blepharoplasty incisions and vertical temporal incisions instead of through conventional preauricular and postauricular incisions. Dissections were made subperiosteally and over the deep layers of deep temporal fascia. Malar fat pads were suspended with 1-0 nylon and affixed to deep temporal fascia. Most patients have been satisfied with their postoperative results, but unfavorable results and complications have been reported. Complications were classified as early or late complications or unfavorable results on the basis of the 3-week postoperative evaluation. There were 28 early complications (11.9 percent), consisting of ecchymosis with edema (persisting for up to 4 weeks), paresthesia, lagophthalmos, accentuated Mongoloid slant, small dimpling on the scalp, and scalp fold formation on the fixation site. There were 13 late complications/unfavorable results (5.5 percent), consisting of insufficient lift, exaggeration of sunken upper eyelids, intermittent headaches, itching sensations, and paresthesia on the scalp. The unfavorable results occurred in the patients who had previously undergone blepharoplasty and in those who had a history of foreign body injections into the face, fatty and thick faces, sunken upper eyelids, Mongoloid slants, and asymmetric facial expressions. Through understanding the anatomic characteristics of the Oriental face (i.e., thick dermis, Mongoloid slant of palpebral fissure, prominent zygoma and mandible angle, and flat nose), satisfying results were achieved by appropriate application of the modified procedures.

Adult↗

National plastic surgery survey: brow lifting techniques and complications.

The purpose of this survey was to assess trends in brow lifting philosophy, techniques, and complications. This is the second of a three-part survey; the first part reported on complications with face lift techniques, and the final report will address practice management issues, including facility and ancillary procedures. Surveys were sent to 3800 members of the American Society of Plastic Surgeons; the response rate was 15 percent. This survey represents data on 6951 brow lifts, of which approximately 50 percent were performed endoscopically and 50 percent with a coronal incision. Several conclusions about the practice of the respondents were reached: (1) Both brow lift techniques were considered to be effective. (2) Surgeons considered coronal brow lifting to be more effective for the three basic goals of brow lifting: brow elevation, reduction of transverse lines, and reduction of glabellar lines. (3) Reported complication rates for both techniques were low, and the most frequent complication was alopecia (varying from 2.9 percent to 4 percent). (4) Patient satisfaction varied from 98.2 percent to 99.2 percent. (5) Major complications were rarely reported.

Data Collection↗

Simulated lift testing using computerized isokinetics.

Eighty-four volunteer asymptomatic men between 18 and 40 years of age were evaluated as to their ability to lift. An innovative isokinetic device was used to measure lifting force. This device does not isolate any specific body part, yet it measures the muscular force of lifting an object whose speed of ascent is controlled. Two lifting methods (bent knee, straight leg) and two foot positions were used. The results indicate the bent-knee lift method and forward-foot position was the position of optimal force production. Force production increase was inversely proportional to age. The authors concluded that the isokinetic lift device has promising capabilities to produce repeatable data and may be advantageous in generating standards for rehabilitation and specific job criteria.

Adolescent↗

Isokinetic lifting strength and occupational injury. A prospective study.

One hundred seventy-one nurses had their back strength evaluated on an isokinetic lifting device and filled out an epidemiologic questionnaire. They were then followed prospectively for 2 years to determine the incidence of job-related low-back injuries. The data were analyzed to determine if the injury incidence correlated with any of the strength or epidemiologic variables collected during the original evaluation. Average peak force measured during the isokinetic lift was 63.8 kg + 13.6 kg at a lift speed of 30.5 cm/sec and 59.1 kg + 14.9 kg at a lift speed of 45.7 cm/sec. Sixteen nurses reported an occurrence of job-related low-back pain or injury during the 2-year prospective period. Discriminate statistical techniques showed that none of the strength or epidemiologic variables correlated with the incidence of pain or injury or explained significant amounts of variance when the variables were regressed on strength or work calculated from the lift force/lift height data. It was concluded that in this high risk population, in which loads are heavy and lifting postures are variable, the use of low-back strength or prior history of pain or injury are poor predictors as to subsequent low-back pain or injury.

Adult↗

Single-staged total body lift after massive weight loss.

This is a retrospective clinical report of a single-staged total body lift in 8 massive weight loss patients. While the combination of circumferential abdominoplasty, a modified lower body lift, and medial thighplasty adequately treats the lower torso and thighs, the residual skin laxity in the upper torso and breasts leaves an incomplete result. Hence, a 2-stage total body lift was designed. The second stage, called the upper body lift, removes epigastric and midback rolls of skin, adjusts the inframammary fold, and reshapes the breast or corrects gynecomastia, leaving behind a near circumferential transverse scar partially hidden by the breasts. In selected patients, a complete torso correction, the total body lift, was done in a single stage. Four to 31 months later, 7 of the 8 patients were satisfied. One male with ultrasonic-assisted lipoplasty and a lateral skin excision found the chest skin too loose. Blood transfusions ranged from none to 4 units. The operations range from 7 to 12 hours of general anesthesia. Hospital stays were from 3 to 4 days. The complications included 3 resolved seromas, 2 minor wound infections due to fat and skin necrosis, and 1 minor skin dehiscence. One patient was readmitted to the hospital due to hypoalbuminemia and generalized edema. Scar revisions and liposuction are scheduled for 2 patients. Single stage total body lift is effective and safe in selected patients after massive weight loss when performed by a plastic surgeon and team experienced in body contouring surgery.

Adult↗