The effect of muscle fatigue on in vivo tibial strains.

Stress fracture is a common musculoskeletal problem affecting athletes and soldiers. Repetitive high bone strains and strain rates are considered to be its etiology. The strain level necessary to cause fatigue failure of bone ex vivo is higher than the strains recorded in humans during vigorous physical activity.

[Effect of physical training on postural control of elderly].

Background: Preservation of balance in the elderly is fundamental to maintaining functional independence. Balance impairments have a tremendous impact on health care costs and quality of life. Fall prevention programs are an important health strategy, consequently there is a general need to develop effective and practical exercise programs that improve balance in the elderly.

Postural stability in the elderly: a comparison between fallers and non-fallers.

Background: the identification of specific risk factors for falls in community-dwelling elderly persons is required to identify older people at risk of falling.

Objective: the aim of the study was to determine the ability of various biomechanical measures of postural stability to identify fallers in the elderly population.

Method: 19 subjects (78.

Aging-induced shifts from a reliance on sensory input to muscle cocontraction during balanced standing.

Background: Peripheral sensation is the most important sensory system in the maintenance of upright posture in all age groups. With aging, visual and somatosensory processing change their prospective contribution to the maintenance of quiet standing, at debated percentages. Aging is associated with a decrease in balance abilities that, in turn, increases the risk of falling.