Endurance Times for Trunk-Stabilization Exercises in Healthy Women: Comparing 3 Kinds of Trunk-Flexor Exercises

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Lu-Wen Chen
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Liu-Ing Bih
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Chi-Chung Ho
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Mao-Hsuing Huang
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Chin-Tien Chen
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Ta-Sen Wei
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Objectives:

To establish isometric endurance times for trunk-stabilization exercises in 6 different positions and compare 3 kinds of trunk-flexor exercises.

Participants:

28 healthy young women with no history of disabling back pain.

Design:

Isometric endurance times were measured in 6 tests: 60° flexor, 45° flexor, curl-up, extensor, and left- and right-side-bridge exercises.

Results:

The mean endurance time was 375 ± 252 seconds for the 60° flexor test; 101 ± 51 seconds, 45° flexor test; 107 ± 54 seconds, curl-up test; 158 ± 45 seconds, extensor test; 70 ± 23 seconds, left-side-bridge test; and 68 ± 23 seconds, right-side-bridge test.

Conclusions:

Of the 3 flexor exercises, the 60° exercise was time consuming and had a larger variance. The 45° flexor exercise and curl-up exercise were time effective and showed less variance. The curl-up exercise is easy, convenient, and representative of trunk-flexor effort and can be considered a preferable alternative to the 60° flexor exercise.

L-W Chen and Wei are with the Dept of Physical Medicine and Rehabilitation, Changhua Christian Hospital, Changhua, Taiwan 500. Bih is with the Dept of Rehabilitation Medicine; Ho, the Dept of Physical Medicine and Rehabilitation, Rehabilitation Hospital; and C-T Chen, the Dept of Obstetrics and Gynecology, Chung Shan Medical University, Taichung, Taiwan 402. Huang is with the Dept of Rehabilitation Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan 807.

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