The mechanostat theory16dictates that bone adaptation is a response system likened to a thermostat in which a set point, or minimum effective strain (MES), is determined by internal & external factors and therefore respond to loads above or below these MES points with either bone formation or resorption. Simply put, load the bone above its natural MES, and it will adapt the bone to support the new demand; conversely, unloading the bone (below its MES) and the BMD will decline to meet its new metabolic environment.
Theoretically, brief, unique, high impact exercise should induce bone formation. Research supporting this theory exists in premenopausal women, however physiologic factors (ie., hormonal, co-morbidities, aging) may prevent similar adaptions in older adults, and other factors (pain, restrictions with co-morbidities, fear, etc.) may prevent the safe or successful implementation of high impact programs in older adults.