Dual-Task Exercise Effects on Balance and Cognition by Physical Performance Level

Physical activity is a fundamental element of a healthy lifestyle, playing a critical role in improving overall health and enhancing long-term quality of life. Defined as any bodily movement produced by skeletal muscles that results in energy expenditure, physical activity encompasses a broad range of behaviors, including household chores, leisure-time sports, school physical education, and structured exercise. Exercise, a subset of physical activity, refers to planned, repetitive, and purposeful movement aimed at improving physical fitness. The frequency, intensity, and duration of activity are key factors in its classification and effectiveness. Physical activities can also be categorized by context-such as those occurring during work, sleep, or leisure time-with leisure-time activities further divided into exercise, sports, domestic chores, and other tasks.

Daily life often requires performing multiple tasks at the same time, placing simultaneous demands on both motor and cognitive functions. Dual-task training, which evaluates the ability to perform cognitive and motor activities concurrently, is gaining increasing attention. In recent years, shifts in occupational and lifestyle demands-driven by technological advancement-have led to increased reliance on cognitive skills, underscoring the importance of dual-task capacity in modern life.

Research has shown that performing simultaneous tasks can challenge attentional resources, particularly when cognitive and motor demands are high. This can lead to decreased performance, a phenomenon referred to as dual-task interference. Such interference is influenced by multiple factors, including task difficulty, attentional demands, task prioritization, and individual characteristics like age, fear of falling, and cognitive or motor abilities.

Balance control depends on the integration of visual, vestibular, and somatosensory inputs, alongside neuromuscular feedback. It is fundamental to the performance of voluntary motor actions and is affected by environmental context and task specificity.

The literature demonstrates that dual-task training has been effective in older adults, improving functions such as gait, balance, and reducing fall risk. Studies involving patients with neurological conditions (e.g., Parkinson's disease) also highlight improvements in motor and cognitive performance following dual-task interventions. These gains have been associated with greater autonomy in activities of daily living.

Despite these promising outcomes, few studies have examined the effects of dual-task training across populations with different physical performance levels. Our study aims to address this gap by evaluating how individuals with varying physical capacities respond to dual-task exercise programs in terms of balance and cognitive function. The overarching goal is to contribute to evidence supporting the integration of dual-task interventions into broader health promotion and rehabilitation strategies targeting both physical and mental well-being.

• Health-Related Quality of Life assessed by the SF-36 Questionnaire [Time frame: At baseline and after 6 weeks exercise program]