Exercise may have beneficial effects on fall rates and health care use in some subgroups of older adults. In community-living adults with mainly mild impairments in gait, balance, and physical health status, short-term exercise may not have a restorative effect on these impairments.

Although the relationship between strength and physical performance in older adults is probably non-linear, few empirical studies have demonstrated that this is so. In a population-based sample of adults aged 60-96 years (n = 409), leg strength was measured in four muscle groups (knee extensor, knee flexor, ankle plantar flexor, ankle dorsiflexor) of both legs using an isokinetic dynamometer. A leg strength score was calculated as the sum of the four strength measurements in the right leg. Usual gait speed was measured over a 15.2 metre course. With a linear model, leg strength explained 17% of the variance in gait speed. Non-linear models (quadratic and inverse) explained significantly more variance (22%). The nature of the non-linear relationship was that, in stronger subjects, there was no association between strength and gait speed, while in weaker subjects, there was an association. Body weight and age also explained significant amounts of variance in gait speed, while sex and height did not. The results supported the hypothesis of a non-linear relationship between leg strength and gait speed that is similar for older men and women. This finding represents a mechanism for how small changes in physiological capacity may have substantial effects on performance in frail adults, while large changes in capacity have little or no effect in healthy adults.

The results suggest, in the range of fitness of the study sample, that changes in gait speed are related to changes in depressive symptoms and physical health status, but not to modest changes in fitness. A model assuming nonlinear relationships may be appropriate for understanding how strength and aerobic capacity affect gait speed.

This prospective, longitudinal study examined the influence of baseline physical and psychological burden on serial assessments of health-related quality of life among adults with major burns from three regional burn centers (n = 162). Physical burden groups were defined by % TBSA burned: <10%, 10% to 30%, or >30%. Psychological burden groups were defined by in-hospital distress using the Brief Symptom Inventory Global Severity Index T-score with scores of < 63 or > or = 63. Analyses compared groups across level of burden and with published normative data. Assessments reflected health and function (Short Form 36) during the month before burn, at discharge, and at 6 and 12 months after burn. Physical functioning was significantly more impaired and the rate of physical recovery slower among those with either large physical burden or large psychological burden. Notably, psychosocial functioning also was more impaired and the rate of psychosocial recovery slower among those with greater psychological burden. These results suggest that, in addition to aggressive wound closure, interventions that reduce in-hospital distress may accelerate both physical and psychosocial recovery.

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