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Abstract:
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  1. Chan EWM, Hamid MSA, Nadzalan AM, Hafiz E
    PMID: 33005073 DOI: 10.1142/S1013702520500080
    Background: Sahrmann five-level core stability test protocol has been used to evaluate the ability of the core muscles to stabilize the spine. However, validation studies on the Sahrmann protocol are limited.

    Objective: The purpose of this study was to compare the different levels of Sahrmann five-level core stability (levels 1-5) on the muscle activity of rectus abdominis (RA), external oblique (EO), and transverse abdominis/internal oblique (TrA/IO).

    Methods: Twenty-two asymptomatic male participants aged 21.3
    6
    ±
    1
    .59 years were recruited. Participants were instructed to perform maximum voluntary contraction (MVC) and five levels of Sahrmann five-level core stability test guided with a pressure biofeedback unit (PBU). The surface electromyography (EMG) data of each muscle during five levels of Sahrmann five-level core stability test were normalized as a percentage of MVC.

    Results: Results showed significant differences in the normalized EMGs of RA [


    χ


    2


    (4) = 64.80,
    p
    <
    0
    .001], EO [


    χ


    2


    (4) = 58.11,
    p
    <
    0
    .001], and TrA/IO [


    χ


    2


    (4) = 56.00,
    p
    <
    0
    .001] between the five levels of Sahrmann five-level core stability test. Post-hoc analysis revealed Sahrmann levels 5 and 3 have significantly higher abdominal EMG signals than levels 4, 2, and 1 (
    p
    <
    0
    .001).

    Conclusion: In conclusion, the Sahrmann five-level core stability test differs according to the level of Sahrmann tests. Significantly higher abdominal muscle activities were observed during levels 3 and 5. Therefore, the classification exchange in levels 3 and 4 of the Sahrmann five-level core stability test should be reconsidered in the future.

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