Barbeau's study examined the effects of holding onto parallel bars versus not holding on during body weight-supported treadmill training in individuals with incomplete SCI. Patients with a pre-existing asymmetrical gait who held onto parallel bars demonstrated which outcome?

Barbeau's study examined the effects of holding onto parallel bars versus not holding on during body weight-supported treadmill training in individuals with incomplete SCI. Patients with a pre-existing asymmetrical gait who held onto parallel bars demonstrated which outcome?

• A. Their gait asymmetry worsened
• B. Their gait asymmetry improved
• C. Their gait became symmetrical
• D. No change in gait symmetry was observed

Answer: (A)

The main idea is that the amount of external support during body weight–supported treadmill training can shape how the legs are driven to work, especially when someone already walks with an asymmetry. When individuals with incomplete SCI hold onto parallel bars, their upper body and arms provide a stabilizing aid that reduces the need to load and propel the weaker (paretic) leg. This external support allows the nonparetic side to dominate more during stepping, so the nervous system receives less practice in coordinating both sides and transferring weight symmetrically. Over time, this diminishes the motor learning and sensory feedback needed to correct asymmetry, so the pre-existing imbalance tends to worsen rather than improve. Conversely, training that challenges symmetry—by reducing reliance on the bars and encouraging weight bearing and active participation from the paretic limb—promotes more balanced gait patterns. So, using parallel bars in this context can undermine efforts to regain symmetry, explaining why gait asymmetry worsened in these patients.

The main idea is that the amount of external support during body weight–supported treadmill training can shape how the legs are driven to work, especially when someone already walks with an asymmetry. When individuals with incomplete SCI hold onto parallel bars, their upper body and arms provide a stabilizing aid that reduces the need to load and propel the weaker (paretic) leg. This external support allows the nonparetic side to dominate more during stepping, so the nervous system receives less practice in coordinating both sides and transferring weight symmetrically. Over time, this diminishes the motor learning and sensory feedback needed to correct asymmetry, so the pre-existing imbalance tends to worsen rather than improve. Conversely, training that challenges symmetry—by reducing reliance on the bars and encouraging weight bearing and active participation from the paretic limb—promotes more balanced gait patterns. So, using parallel bars in this context can undermine efforts to regain symmetry, explaining why gait asymmetry worsened in these patients.