Defining Clinically Meaningful Cut Points for Leg Power Impairment Using Physical Performance in Older Adults: A...

Area of Science:

• Gerontology
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Leg power is crucial for mobility in older adults.
• The stair climb power test (SCPT) measures leg power but lacks established clinical thresholds for impairment.
• Identifying these thresholds is vital for targeted interventions.

Purpose of the Study:

• To establish clinically meaningful thresholds for leg power impairment using the SCPT.
• To correlate SCPT scores with mobility limitations defined by the Short Physical Performance Battery (SPPB).

Main Methods:

• Cross-sectional analysis of baseline data from the Boston Rehabilitative Impairment Study of the Elderly.
• Community-dwelling older adults (N=413) were assessed using SCPT and SPPB.
• Receiver operating characteristic curves and Youden's J statistics identified optimal SCPT thresholds for mobility limitation (SPPB ≤9).

Main Results:

• Optimal SCPT thresholds for mobility limitation were identified: 3.07 Watts/kg for men (AUC=0.78) and 2.59 Watts/kg for women (AUC=0.81).
• Sensitivity and specificity values indicated good accuracy in identifying impaired individuals.
• Classification and regression tree analysis confirmed similar thresholds.

Conclusions:

• Clinically meaningful thresholds for SCPT-identified leg power impairment in mobility-limited older adults were established.
• These thresholds can inform rehabilitation care to enhance functional mobility.
• Further validation in larger clinical trials is recommended.