Most of the literature agrees that FO, NFO and OTS must be viewed on a continuum with a disturbance, an adaptation and finally a maladaptation of the hypothalamic–pituitary–adrenal axis (HPA), resulting in an altered hormonal response to intense training and competition.3,–,12 When investigating hormonal markers of training adaptation, it is important to target specific hormones for their information potential and to synchronise their sampling in accordance with their response patterns.
Degenhardt B [Internet]. Once upon a time: the evolution of Pilates mat work. 2012 Nov 21 [cited 2015 Aug 30]. Available from: http://benjamindegenhardt.com/once-upon-a-time/.  Pilates swiftly gained prominence with dancers and celebrities, which led to his notoriety as a New York City exercise personality. In 1932, Pilates taught Contrology exercises at the mythological Jacob’s Pillow Dance Festival as he did every summer until 1951.42,43 Degenhardt B [Internet]. Once upon a time: the evolution of Pilates mat work. 2012 Nov 21 [cited 2015 Aug 30]. Available from: http://benjamindegenhardt.com/once-upon-a-time/.
The world population is ageing and the number of older adults with chronic health conditions and physical limitations is expected to increase. This, in turn, could lead to an increased burden on healthcare services [1]. Regular physical activity is an important component of successful ageing and reduces the risk of developing several age- and lifestyle related diseases such as cardiovascular disease, dementia and type 2 diabetes [2–7]. However, making older adults exercise and keeping them in exercise programs is a major challenge [8]. Understanding how older adults prefer to exercise may help developing tailored exercise programs and increase sustained exercise participation in ageing populations.

Do you even lift, bro? While putting away groceries, do bicep curls with cans, bottles, or other objects. You can also try holding these objects above your head for ten seconds before putting them away. Alternately, when grocery shopping, opt for a basket instead of a cart when you can. You'll be working out your upper body without even thinking about it.
Too much exercise can be harmful. Without proper rest, the chance of stroke or other circulation problems increases,[80] and muscle tissue may develop slowly. Extremely intense, long-term cardiovascular exercise, as can be seen in athletes who train for multiple marathons, has been associated with scarring of the heart and heart rhythm abnormalities.[81][82][83] Specifically, high cardiac output has been shown to cause enlargement of the left and right ventricle volumes, increased ventricle wall thickness, and greater cardiac mass. These changes further result in myocardial cell damage in the lining of the heart, leading to scar tissue and thickened walls. During these processes, the protein troponin increases in the bloodstream, indicating cardiac muscle cell death and increased stress on the heart itself.[84]
Physical exercise is important for maintaining physical fitness and can contribute to maintaining a healthy weight, regulating digestive health, building and maintaining healthy bone density, muscle strength, and joint mobility, promoting physiological well-being, reducing surgical risks, and strengthening the immune system. Some studies indicate that exercise may increase life expectancy and the overall quality of life.[10] People who participate in moderate to high levels of physical exercise have a lower mortality rate compared to individuals who by comparison are not physically active.[11] Moderate levels of exercise have been correlated with preventing aging by reducing inflammatory potential.[12] The majority of the benefits from exercise are achieved with around 3500 metabolic equivalent (MET) minutes per week.[13] For example, climbing stairs 10 minutes, vacuuming 15 minutes, gardening 20 minutes, running 20 minutes, and walking or bicycling for transportation 25 minutes on a daily basis would together achieve about 3000 MET minutes a week.[13] A lack of physical activity causes approximately 6% of the burden of disease from coronary heart disease, 7% of type 2 diabetes, 10% of breast cancer and 10% of colon cancer worldwide.[14] Overall, physical inactivity causes 9% of premature mortality worldwide.[14]
When stress is chronically induced, as in NFO and OTS, two specific mechanisms could occur: first, when corticosteroid levels are chronically too high, a hypersensitivity of the receptors will occur, this can lead to a disinhibition of CRHproducing neurons, which in turn will lead to an intensified release of ACTH (as seen in the second exercise bout in the NFO athletes). When the chronic stress situation continues and glucocorticoid receptors are chronically activated (which occurs in post-traumatic stress disorder17 and depression),25 a blunted ACTH response to CRH will occur.28
Summary of long-term adaptations to regular aerobic and anaerobic exercise. Aerobic exercise can cause several central cardiovascular adaptations, including an increase in stroke volume (SV)[102] and maximal aerobic capacity (VO2 max),[102][103] as well as a decrease in resting heart rate (RHR).[104][105][106] Long-term adaptations to resistance training, the most common form of anaerobic exercise, include muscular hypertrophy,[107][108] an increase in the physiological cross-sectional area (PCSA) of muscle(s), and an increase in neural drive,[109][110] both of which lead to increased muscular strength.[111] Neural adaptations begin more quickly and plateau prior to the hypertrophic response.[112][113]
Thus, little is known about the effects of monitored vigorous exercise in elderly people. While significant benefits for basic motor tasks (such as balance and gait) can be achieved through different kinds of physical activity (i.e., stretching exercises, treadmill, Pilates, and strength and balance training), no conclusive relationship has been proven between its intensity and such improvements. Recently, Pau et al. [14] reported that spatiotemporal gait parameters and sit-to-stand performance significantly improve through vigorous (but not light) exercises, thus suggesting that higher levels of intensity might be more suitable in generally improving static and dynamic daily motor tasks.
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