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Commentary

Dr. Soderberg is Associate Professor & Associate Director, Physical Therapy Education, The University of Iowa, 2600 Steindler Building, Iowa City, IA 52242

This excerpt was created in the absence of an abstract.

This paper is of interest to physical therapists because the muscular mechanism for performing straight leg raising is assessed. In most cases, we know little about how muscles perform synergistically.

The literature review provides the reader with representative and relevant work that has preceded this study. Suitable methodology was selected for answering the question posed by the investigators. The instrumentation and data-processing techniques are well described and inclusive. The electrode-skin impedance is well above the recommended values for surface electrodes,¹ however, and the unusual value for this characteristic deserves comment.

Normalizing the EMG data is a sound and necessary technique that subsequently allows for assessments across subjects. The reader is left to speculate on the exact means of data reduction applied because manual measurement can mean planimetry or a number of other measurement techniques that provide average values.

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