Falls during walking are one of the leading causes of injury in older adults and are often triggered by unexpected perturbations that challenge balance control. With aging, decline in lower-limb muscle strength and alterations in neuromuscular control reduce the ability to adapt motor responses to such disruptions. Understanding how neuromuscular control adapts to unexpected challenges is therefore essential to studying an individual's reactive balance capacity. Accordingly, muscle synergies represent low-dimensional units of the neuromotor system that coordinate the activation patterns across muscle groups and are often used to examine neuromuscular control during steady-state and perturbed walking. Assessing how neuromuscular control adjusts in response to perturbations over time could help identify compensatory neuromuscular strategies.