Tag: musculoskeletal disorders

Pushmi-Pullyu Mentality Increases Workplace Injury

Remember the Pushmi-pullyu (push-me-pull-you) from Hugh Lofting’s Dr. Dolittle stories for children? It was an antelope with two heads, one on each end of its body. (In the popular Eddie Murphy movies, they used a llama.) Whenever the creature wanted to move, both heads would take off at once, pushing and pulling back and forth and going nowhere. Since pushing and pulling exert two of the greatest stresses on the body, the poor critter must have been in constant need of the good doctor’s chiropractic skills! That same Pushmi-pullyu mentality toward workplace task and equipment design can put your employees at serious risk of sustaining disabling musculoskeletal injuries.

Pushing, pulling, lifting and carrying tasks place a greater strain on the human body’s soft tissues — muscles and tendons — than any other tasks. These tasks are also universal to nearly all work environments. Wheeled carts, platforms or equipment must be loaded and unloaded and pushed and pulled through manufacturing plants, distribution centers, hospital corridors, grocery store aisles, hotel hallways, office buildings and retail establishments. Most jobs require at least occasional pushing, pulling, lifting or carrying; and many jobs require workers to spend their entire workday engaged in these activities, performing the same, repetitive movements hour after hour. The cumulative wear and tear on the body can lead to serious injury of soft tissues and eventual disability.

Too often tasks, work spaces and equipment aren’t designed to accommodate the natural differences in the size and physical capabilities of workers. A task performed first shift by a six-foot, 180-pound, 25-year-old male may be performed second shift by a five-foot three-inch, 130-pound, 45-year-old female and third shift by a five-foot seven-inch, 260-pound, 60-year-old male. Because work tasks and equipment are usually designed around a “standard” worker type — which, unfortunately, few workers match — most workers are forced to assume awkward postures while exerting force to complete work tasks. Serious, debilitating strains and sprains can result, particularly when these actions are repeated over time.

When soft tissues in the arms, shoulders, back and legs are injured, the tissues recover, though it may take some time. But repeated injury, particularly when it occurs before tissues have had time to fully recover, interferes with the body’s natural healing process, overwhelming the body’s ability to recover and leading to permanent, disabling injury. Such cumulative traumas are called musculoskeletal disorders. Also referred to as repetitive stress injuries and repetitive motion injuries, these serious, disabling strains and sprains cost U.S. businesses tens of billions of dollars each year.

Next time: Ergonomics; just what the doctor ordered.

Ergonomics: Just What the Doctor Ordered

Pushing, pulling, lifting and carrying tasks place a greater strain on the human body’s soft tissues — muscles and tendons — than any other workplace tasks. Universal to nearly every work environment, these tasks are the source of musculoskeletal injuries that annually cost U.S. businesses tens of billions of dollars. Fortunately, most of these injuries are preventable. The debilitating and disabling strains and sprains that annually plague millions of U.S. workers can be largely prevented with the adoption of ergonomic practices and the use of ergonomically-designed equipment.

Workers come in all shapes and sizes, but work tasks and equipment are usually “one size fits all.” Most workplace musculoskeletal injuries occur when workers are forced to adapt their bodies to fit the task or equipment, torquing their bodies into awkward postures that increase stress on muscles and tendons. For example, when pushing, pulling or maneuvering a heavy wheeled cart, a worker must exert significant force to overcome rolling resistance. While handholds designed to assist in force delivery may be at the correct level for an average-sized male, even an averaged-sized female worker will have to stretch and strain to move the cart, placing undue stress on back, leg, shoulder and arm muscles. The risk of musculoskeletal injury is great when worker and equipment are not a perfect fit.

Ergonomics is the science of fitting the equipment or task to the capabilities of the worker to prevent musculoskeletal injury. Ergonomically-designed equipment, like the powered carts and movers designed and manufactured by DJ Products, takes into account a host of variables that affect worker production and efficiency. The type of task, force required, worker gender and diversity, optimal handhold height, distance, and frequency of the task must all be considered in the design of ergonomic equipment.

DJ Products is a major innovator in the design and manufacture of ergonomic solutions to material handling situations. Our ergonomically-designed electric and motorized carts, tugs and movers eliminate the strains and pains associated with manually pushing and pulling heavy carts, equipment or materials in a wide variety of industrial and retail environments. Our products are less costly, smaller and more maneuverable than traditional electric equipment used to move carts and equipment on production floors and in warehouses. Our battery-powered walk-behind movers provide maximum operator control and safety while offering superior maneuverability, even in narrow or tight spaces like busy hospital corridors and crowded grocery aisles. As a leading manufacturer of ergonomic powered carts and movers, DJ Products has built a reputation for developing ergonomic solutions to unique and specialized customer material handling challenges. Contact our ergonomic sales engineers today for an evaluation of your ergonomic needs.

Ergonomic Controls Prevent Carpal Tunnel Syndrome

Constant numbness in the hands, sharp shooting pains in the wrist and up arms, loss of grip strength or even the ability to maintain a grip on objects, loss of feeling in fingers — the symptoms of carpal tunnel syndrome are frightening and the pain is great enough to wake you up at night. Left untreated, the condition is debilitating and can cause permanent damage to your hands.

Because of the serious and debilitating repercussions of carpal tunnel syndrome DJ Products designs all of its material handling equipment with ergonomic controls, handles and handholds. Our goal is to provide ergonomically-designed material handling equipment that protects the health and safety of workers by eliminating the potential for debilitating musculoskeletal injuries, including carpal tunnel syndrome.

Carpal tunnel syndrome is a painful, progressive condition caused when the median nerve, the key nerve in the wrist, is continuously compressed by swollen tissue. The median nerve controls sensations and impulses to the muscles on the palm side of the hand, thumb and all of the fingers except the pinkie. The median nerve runs from the forearm into the hand through a narrow bony passage at the wrist called the carpal tunnel. The carpal tunnel also houses tendons that allow the wrist and hand to move. When repetitive motion activities or repeated stress from pushing and pulling heavy carts irritates wrist tendons, they swell, pressing on the median nerve. The result is numbness, weakness and pain that radiates from the fingertips up the arm.

When workers continue to perform daily tasks that irritate wrist tendons, pressure on the median nerve becomes constant, eventually causing permanent damage. Without nerve support, the individual gradually loses fine motor and may even lose gross motor control of his hands and fingers. He may lose the ability to sense hot and cold. Muscles at the base of the thumb atrophy, and hands can become deformed. Left untreated, carpal tunnel syndrome can cause life-altering disability.

Repetitive motion activities on the job and strain from pushing and pulling heavy equipment are the leading causes of carpal tunnel syndrome in the U.S. According to the National Institute of Neurological Disorders and Stroke, in a 1998 study 3 out of every 10,000 U.S. workers were affected by carpal tunnel syndrome. On average, each worker missed 10 days of work and incurred medical bills of $30,000. Treatment of chronic cases requires surgery and an average 6 to 8 weeks for recovery. Utilizing equipment with ergonomically-designed controls and handles can effectively eliminate the risk of carpal tunnel syndrome.