Intratester Reliability for Determining an 8-Repetition Maximum for 3 Shoulder Exercises Using Elastic Bands

in Journal of Sport Rehabilitation
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Context:

Standardization of training load using the 1-repetition maximum (1RM) test cannot be directly applied when using elastic bands as resistance.

Objective:

To determine the intratester reliability for establishing an 8-repetition maximum (8RM) using elastic bands.

Design:

Test–retest.

Participants:

5 men, 10 women, 23–29 years.

Intervention:

An 8RM test was established for 3 shoulder exercises using the Dura-Band® exercise system.

Main Outcome Measures:

The length of the elastic band was recorded. An analysis of variance was performed, and intraclass correlation coefficients (ICC) were calculated for each exercise.

Results:

Intratester reliability for determining the elastic-band length required to establish an 8RM was very high for internal rotation (ICC = .91) and high for external rotation (ICC = .77). The diagonal pull-down 8RM test had moderate reliability (ICC = .65).

Conclusion:

Training load can be reliably standardized in healthy young adults using moderate-to high-resistance elastic bands with a goal-based multiple-RM test.

Newsam is with the Pathokinesiology Laboratory, Rancho Los Amigos Natl Rehabilitation Ctr, Downey, CA 90242. Leese is with Gail Wehner Physical Therapy, Santa Monica, CA 90404. Fernandez-Silva is with the Dept of Physical Therapy, Scripps Memorial Hospital, Encinitas, CA 92024.