Older adults with sarcopenia demonstrated 35% worse force control steadiness when performing simple motor tasks while cognitively distracted, compared to single-task conditions. The study of 52 participants found sarcopenic individuals had 45-84% worse torque steadiness than controls even during isolated tasks, with motor unit discharge patterns becoming increasingly erratic under dual-task demands. This neuromuscular instability represents a previously underappreciated dimension of sarcopenia beyond the typical focus on strength and muscle mass loss. The findings suggest sarcopenic individuals may face compounded fall risk in real-world scenarios requiring simultaneous motor and cognitive processing—like walking while talking or navigating obstacles. The altered neural firing patterns, particularly increased alpha and beta-band coherence during dual-tasking, point to compensatory but inefficient central nervous system strategies. While master athletes maintained or improved motor control under cognitive load, sarcopenic adults showed progressive deterioration. These insights could reshape sarcopenia screening to include dual-task assessments and inform targeted interventions combining motor and cognitive training. However, as a preprint awaiting peer review, these results require validation through the formal review process before clinical application.