Dynamic Balance in Spinal and Bulbar Muscular Atrophy: Relationship between Strength and Performance of Forward Lunge, Step Up and Over, and Step Quick Turn

Table 2

Muscle strength as a discriminator between those in the SBMA cohort who were able versus those who were not able to complete each balance test. Strength values are expressed as a percentage of predicted. For clarity, only the right side is presented except for averaged composite strength (lower extremities).

Muscle group	Able to complete ()		Not able to complete ()		AUC	95% CI
Forward lunge
Lower extremities		28		15	0.62	0.43-0.81
Knee extension		28		15	0.67	0.48-0.87
Ankle dorsiflexion		28		15	0.67	0.49-0.85
Ankle plantarflexion		28		15	0.60	0.41-0.80
Hip extension		28		15	0.47	0.29-0.65
Step quick turn
Lower extremities	0.52±0.18	26	0.39±0.11	19	0.75	0.61–0.90
Knee extension	0.44±0.20	26	0.26±0.12	19	0.78	0.64–0.92
Ankle dorsiflexion	0.47±0.20	26	0.36±0.36	19	0.65	0.49–0.82
Ankle plantarflexion	0.34±0.20	26	0.21±0.21	19	0.78	0.64–0.92
Hip extension	1.03±0.43	26	0.92±0.26	19	0.45	0.28–0.63
Step up and over
Lower extremities		25		15	0.89	0.79–1.00
Knee extension		25		15	0.89	0.78–1.00
Ankle dorsiflexion		25		15	0.66	0.48–0.83
Ankle plantarflexion		25		15	0.87	0.75–0.99
Hip extension		25		15	0.78	0.64–0.93