Electromyographic normalization procedures for determining exercise intensity of closed chain exercises for strengthening the quadriceps femoris muscles.

The purpose of this study was to compare the electromyographic (EMG) amplitudes of the quadriceps femoris (QF) muscles during a maximum voluntary isometric contraction (MVIC) to submaximal and maximal dynamic concentric contractions during active exercises. A secondary purpose was to provide information about the type of contraction that may be most appropriate for normalization of EMG data if one wants to determine if a lower extremity closed chain exercise is of sufficient intensity to produce a strengthening response for the QF muscles. Sixty-eight young healthy volunteers (39 female, 29 male) with no lower extremity pain or injury participated in the study.

Surface electromyographic analysis of the low back muscles during rehabilitation exercises.

Study Design: Prospective, single-group, repeated-measures design.

Objective: To analyze the longissimus thoracis and lumbar multifidi muscle activity with surface electromyography (EMG) during exercises used in back rehabilitation programs.

Background: Physical therapists use a variety of exercises when rehabilitating patients with low back pain (LBP).

Electromyographic analysis of core trunk, hip, and thigh muscles during 9 rehabilitation exercises.

Study Design: Prospective, single-group, repeated-measures design.

Objective: To identify exercises that could be used for strength development and the exercises that would be more appropriate for endurance or stabilization training.

Background: The exercises analyzed are often used in rehabilitation programs for the spine, hip, and knee.

Normalization procedures using maximum voluntary isometric contractions for the serratus anterior and trapezius muscles during surface EMG analysis.

The serratus anterior and trapezius muscles are considered to be the only upward rotators of the scapula and are very important for normal shoulder function. A variety of methods have been used to produce a maximum voluntary isometric contraction (MVIC) of these muscles for normalization of EMG data. The purpose of this study was to quantify the surface EMG activity of the serratus anterior muscle and the upper, middle, and lower parts of the trapezius during 9 manual muscle tests performed with maximum effort in 30 subjects.

Comparing the function of the upper and lower parts of the serratus anterior muscle using surface electromyography.

Study Design: Prospective single-group repeated-measures design.

Objective: To use electromyographic (EMG) analysis during muscle testing to determine if there is a difference in function of the upper and lower parts of the serratus anterior (SA) muscle.

Background: The SA muscle is a very important scapular protractor and upward rotator.

Surface electromyographic analysis of exercises for the trapezius and serratus anterior muscles.

Study Design: This study used a prospective, single-group repeated-measures design to analyze differences between the electromyographic (EMG) amplitudes produced by exercises for the trapezius and serratus anterior muscles.

Objective: To identify high-intensity exercises that elicit the greatest level of EMG activity in the trapezius and serratus anterior muscles.

Background: The trapezius and serratus anterior muscles are considered to be the only upward rotators of the scapula and are important for normal shoulder function.

Examination of and intervention for a patient with chronic lateral elbow pain with signs of nerve entrapment.

Background And Purpose: Lateral elbow pain has several causes, which can make diagnosis difficult. The purpose of this case report is to describe the examination of and the intervention for a patient with chronic lateral elbow pain who had signs of nerve entrapment.

Case Description: The patient was a 43-year-old woman who had right lateral elbow pain for about 4 months, which she attributed to extensive keyboard work on a computer.