Hamstring muscle use in women during hip extension and the nordic hamstring exercise: A functional magnetic resonance imaging study

Daniel J. Messer, Matthew N. Bourne, Morgan D. Williams, Aiman A.L. Najjar, Anthony J. Shield*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract


    Background

    Understanding hamstring muscle activation patterns in resistance training exercises may have implications for the design of strength training and injury prevention programs. Unfortunately, surface electromyography studies have reported conflicting results regarding hamstring muscle activation patterns in women.

    Objectives

    To determine the spatial patterns of hamstring muscle activity during the 45° hip extension and Nordic hamstring exercises in women using functional magnetic resonance imaging (fMRI).

    Methods

    This was a cross-sectional study in which 6 recreationally active women with no history of lower-limb injury underwent fMRI on both thighs before and immediately after 5 sets of 6 bilateral eccentric contractions of the 45° hip extension exercise or the Nordic exercise. Using fMRI, the transverse (T2) relaxation times were measured from pre-exercise and postexercise scans, and the percentage increase in T2 was used as an index of muscle activation.

    Results

    The fMRI revealed a significantly higher biceps femoris long head-to-semitendinosus ratio during the 45° hip extension exercise than in the Nordic exercise (P = .028). The T2 increase after the 45° hip extension exercise was greater for the biceps femoris long head (P<.001), semitendinosus, and semimembranosus (P≤.001) than that for the biceps femoris short head. During the Nordic exercise, the T2 increase of the semitendinosus was greater than that of the biceps femoris short head (P<.001) and biceps femoris long head (P = .001).

    Conclusion

    While both exercises involve high levels of semitendinosus activation in women, the Nordic exercise preferentially recruits that muscle, while the hip extension exercise more evenly activates all the biarticular hamstrings.

    Original languageEnglish
    Pages (from-to)607-612
    Number of pages6
    JournalJournal of Orthopaedic and Sports Physical Therapy
    Volume48
    Issue number8
    Early online date23 Apr 2018
    DOIs
    Publication statusE-pub ahead of print - 23 Apr 2018

    Keywords

    • Functional magnetic resonance imaging (fMRI)
    • Prevention (injury)
    • Strength training

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