A longer life with a Superman bicycle
A new type of exercise equipment can prevent serious lifestyle illnesses in paraplegic patients.The equipment, which was partly developed at NTNU, was first designed for the American actor Christopher Reeve.
Patients who are unable to walk after a spinal injury have a poorer quality of life and a shortened lifespan than their non-paralysed counter- parts. Sitting passively in a chair makes people susceptible to weight and digestion problems, lower bone density, diabetes – and last but not least, heart and circulation problems.
“It’s the circulation problems that are the most difficult for them, and it’s circulation problems that kill them,” says Jan Hoff, a professor of medicine at NTNU.
But it does not have to be that way. A new type of exercise equipment, partly developed at NTNU, combined with a new training plan, makes it possible for spinal patients to exercise and enjoy improved health – at least as far as the heart is concerned.
In an exercise study completed last year, patients who were paralysed from the chest or waist down experienced an average increase in their maximal oxygen uptake by 25 per cent and in their heart pumping volume by fully 37 per cent – after just eight weeks of training.
Never before has so much improvement or such impressive results been documented in this patient group.
Not just a stationary bike
This clever training equipment is called Ergys 2, and was originally designed in the United States. It was Christopher Reeve – who himself played Superman in films, but who became a quadriplegic after a riding accident – who financed the development of the rehab equipment, in the hopes of improving his own health. But that did not happen as the actor died of heart failure when he was just 52. Nevertheless, his efforts gave the world’s spinal injury patients a useful piece of rehabilitation equipment.
The Ergys 2 is a stationary training bicycle, where the patient’s legs and feet are strapped to a leg holder and pedals. Electrodes are then fastened to the patient’s thigh and seat muscles, and electrical impulses trigger the muscles to contract and relax. The impulses are computer controlled to guarantee the best possible effect.
Even though it may seem like artificial training, it is real enough – it is the patient’s own muscles that are working. And it is movement that demands energy: the blood flow increases, and the pulse goes up. The exercise has an effect on muscle mass, muscle strength, oxygen uptake and the heart’s pumping volume.
Hard workouts, few repetitions
But it is not enough to focus on the legs and buttocks, if this kind of training is going to make a real difference. The more muscle groups that are involved, the greater the blood flow, and the more beneficial it is for the heart. That is where the NTNU researchers come into the picture. They have found a way to supplement the Ergsys 2 with an arm cycle, intended for patients who can use their arms without help.
The patients who participated in the training study were also able to simultaneously exercise their shoulders, arms, buttocks and legs, in a high intensity interval 4 x 4 minute pattern. That translates into four minutes of hard exercise followed by three to four minutes of easier training – with the entire procedure repeated four times per session, three days a week.
NTNU’s Professor Jan Hoff developed this interval approach several years ago, along with his colleague Jan Helgerud. He uses this interval technique for most types of physical training.
“Hard workouts, few repetitions. There is no other training approach that gives better results in improving oxygen uptake or muscle strength than that,” he says.
A preventative approach
Never before has research documented such a significant effect on the heart and circulation in patients with spinal injuries, as the study has shown. There has been relatively little research overall on spinal patients and exercise, in terms of what kind and how much exercise actually gives beneficial results.
The patients in this study were so out of shape when they started that they were unlikely to reach a normal level. But Hoff does not think this is an impossible goal.
“We really don’t know, but there’s no reason to believe that the improvements will stop where they are now,” he says.
Hoff does not want to speculate on the implications of his research on the treatment of Norwegian patients paralysed from spinal injuries.
“We are researchers, not therapists,” he says. “But it is clear that what we are doing has consequences, both for Norway and for the world. And that gives us a great opportunity to prevent lifestyle-related illnesses.”
Unplugged?
Under Hoff’s guidance, Berit Brurok conducted the study for her master’s thesis in exercise physiology. Berit Brurok is continuing her work in this area as a part of her PhD research, in cooperation with Dr Tom Tørhaug at St. Olavs Hospital in Trondheim.
Because the Ergys 2 is expensive, and because it also requires assistance to use it, the researchers are looking to see if the results from the study can be transferred to other activities. Would it be possible to do something similar in a wheelchair? Could it be done without electricity?
If they succeed, it could mean a better quality of life and a longer life for many people. In Norway alone there are 5000 spinal injury patients, while in the USA that number may be closer to 500 000.
By Lisa Olstad
