A study of caregivers by a research team at Ohio State University has proven the off-repeated adage “stress can kill you” is true. The focus of the investigation was the effect the stress of caregiving had on caregivers. The team, led by Dr. Janice Kiecolt-Glaser, reports on a 6-year study of elderly people caring for spouses with Alzheimer’s Disease. The study not only found a significant deterioration in the health of caregivers when compared to a similar group of non-caregivers but also found the caregivers had a 63% higher death rate than the control group.
The demands on a caregiver result in a great deal of stress. It is often observed in aging publications that stress can induce illness and depression. The resulting poor health can further decrease the effectiveness of the caregiver and in some cases, as proven by the study mentioned above, even cause premature death.
Stress can be defined as a physiological reaction to a threat. The greater the threat, the greater the level of stress. A threat is a real or perceived action against our person. Threats may include the anticipated possibility of death or injury but may also include challenges to our self-esteem, social standing or relationships to others or a threat may simply be a potential or real disruption of our established routines. What is stressful to one person may not be to another. For example, bumper-to bumper traffic might be stressful to the woman executive who is late for an important meeting but to the delivery man who has no deadline and is being paid by the hour, it may be a welcome respite to relax and listen to the radio.
Stress produces real physical changes. In some unknown way the fears in our mind, both conscious and unconscious, cause the hypothalamus and pituitary glands, deep in our brain, to initiate a cascade of hormones and immune system proteins that temporarily alter our physical body. This is a normal human physiological response inherent to the human body when a threat is perceived – real or not. It is often called the “fight-or-flight response” or the “stress response”. The purpose is to give us clearer thought and increased strength as well as to activate the immune system to deal with potential injury and to repair potential wounds. When the perceived threat is removed, assuming no damage is done, the body returns to normal.
A team of researchers at Ohio State University Medical Center has found a chemical marker in the blood that shows a significant increase under chronic stress and is linked to an impaired immune system response in aging adults. The team, led by Dr. Janice Kiecolt-Glaser, reports in an issue of Proceedings of the National Academy of Sciences on a 6-year study of elderly people caring for spouses with Alzheimer’s Disease. With the caregivers, the team found a four-fold increase in an immune system protein – interleukin (IL-6) – as compared to an identically matched control group of non-caregivers. Only the stress of caregiving correlated to the marked increase of IL-6 in the caregiver group. All other factors, including age, were not significant to the outcome. Even the younger caregivers saw an increase in IL-6.
The study also found that the caregivers had a 63% higher death rate than the control group. About 70% of the caregivers died before the end of the study and had to be replaced by new subjects. Another surprising result was that high levels of IL-6 continued even three years after the caregiving stopped. Dr. Glaser proposes the prolonged stress may have triggered a permanent abnormality of the immune system.
