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A strength-endurance diagram predicts that a person should be able to perform 30 repetitions of an exercise if the resistance level is 60% of 1-repetition maximum (1RM).
To compare the number of repetitions predicted by the diagram with recorded repetitions of a shoulder exercise.
Single-group comparison with a standard.
34 healthy adults (20 women, 14 men) with a mean age of 29 years (range 20–49).
Main Outcome Measures:
The number of repetitions that subjects could perform in good form of a shoulder exercise with resistance of 60% 1RM.
The mean number of repetitions was 21 (± 3, range 15–28), which was significantly different than the 30 repetitions that the diagram predicted.
The strength-endurance diagram did not accurately predict the number of repetitions of a shoulder exercise that subjects could perform.
Walker, Tamburello, and Jamali are with the School of Physical Therapy, Old Dominion University, Norfolk, VA 23529. Sussman is with the Dept of Biology, Tidewater Community College, Norfolk, VA 23510. VanLunen and Dowling are with the Dept of Exercise Science, Old Dominion University, Norfolk, VA 23529, as was Sussman at the time this study was conducted.