Ageing and Changes in Other Systems
Aging refers to the physiological changes that occur in the human body from the attainment of adulthood, and ending in death.
- These changes involve a decline of biological functions, and are accompanied by psychological, behavioural, and other changes.
- Some of these changes are quite obvious, while others are subtle.
- Loss of teeth, dental caries (tooth decay), gingival recession with problems adapting to dentures and altered bite – any of these can affect appetite.
- Atrophic changes in jaw, mucosae, intestinal glands and muscularis (the thin layer of smooth muscle that forms part of a mucous membrane, as in the esophagus) with asymptomatic alterations in secretion, motility and absorption, and reduced surface area in the small bowel.
- Liver - impairments suspected in the older people. Can lead to anorexia and malnutrition, defective absorption of iron and vitamins eg B12, and to pernicious anaemia or iron deficient anaemia through chronic blood loss.
- Oesophageal reflux, ulcerations and conditions such as diverticulosis - can be issues.
- Constipation - often due to a combination of dehydration, immobility and poor dietary roughage intake as compared to serious pathology.
- Gastrointestinal problems may lead to an altered nutritional status, so you will need to be aware of how much energy your treatment is using.
At rest, a person can maintain a constant internal environment, but capacity to react to stress. In the elderly the response to the eg demands of daily living (a stress)is markedly lessened owing to two key characteristics of ageing:
1. Poverty of reserve which impairs the ability to restore systemic equilibrium quickly when it is upset
2. Breakdown in co-ordination because different organs age at different rates hence functions dependent on the performance of several systems are therefore impaired. eg Temperature intolerance is an issue eg eg undress in a gym, may consider to be too cold; use of heat or ice as treatment modalities. If a patient ‘overheats’ and is unaware of the rising temperature, you may have a fainter on your hands.
Failure is not a consequence of normal ageing, but as in other systems, poverty of reserves may precipitate evidence of deficiency.
- Secretory capacity of pancreatic beta cells diminishes and abnormality of glucose tolerance increases with age.
- The efficiency of insulin in dealing with excess glucose declines.
- Functional thyroid activity declines with age.
- Basal metabolic rate and radioactive iodine uptake fall.
- Pituitary activity appears to be retained at normal levels with age, but adrenal activity is impaired.
Clinical disorders will include diabetes, myxoedema (severe hypothyroidism) and thyrotoxicosis (the condition caused by excessive quantities of thyroid hormones)
Central autonomic dysfunction
May contribute to: postural hypotension; impaired temperature control and the risk of hypothermia; loss of appreciation of visceral pain; and defective alimentary motility.
The immune system has the enormous task of recognising self from non-self.
- Not all components of the immune system may be equally affected by ageing, but dysfunction known to accompany ageing, increases susceptibility to a number of disabling diseases having different aetiologies.
- Increasing incidence of tumourigenesis occurs with age.
- Levels of circulating antibodies begin to decline, therefore infectious diseases occur more frequently and with greater consequences in older people, e.g. pneumonia, influenza, urinary tract infections.