• Neuromodulation · Dec 2018

    Randomized Controlled Trial Clinical Trial

    Cramp Training Induces a Long-Lasting Increase of the Cramp Threshold Frequency in Healthy Subjects.

    • Michael Behringer, Volker Spieth, Montag Johannes Caspar Konrad JCK Institute of Training Science and Sport Informatics, German Sport University Cologne, Cologne, Germany. , Steffen Willwacher, Molly Leigh McCourt, and Joachim Mester.
    • Institute of Training Science and Sport Informatics, German Sport University Cologne, Cologne, Germany.
    • Neuromodulation. 2018 Dec 1; 21 (8): 809-814.

    ObjectiveA low cramp threshold frequency (CTF) is associated with an increased cramp susceptibility. Recent data indicate that the CTF can be substantially increased by a cramp training consisting of electrically induced muscle cramps (EIMCs). This study investigated if four cramp training sessions induce sustained effects on the CTF.MethodsIn ten healthy male subjects, EIMCs were induced in the gastrocnemius medialis of one leg (intervention leg, IL) twice a week, while the opposite leg served as control leg (CL). The stimulation protocol consisted of three sets of six bipolar rectangular wave pulsed currents (5 sec on, 10 sec off) at 30 Hz above the individual CTF.ResultsAfter four cramp training sessions (2 weeks) the CTF differed (p < 0.001) from pre-values in the IL (pre: 19.2 ± 1.4 Hz post 29.8 ± 8.0 Hz) but not in the CL (pre: 18.2 ± 1.5 Hz post 19.6 ± 2.8 Hz; p > 0.05). Thereafter, the CTF remained elevated in the IL for 22 days (22 days post: 22.2 ± 3.2 Hz; p < 0.05) when compared to pre and was significantly (p < 0.05) higher than that of the CL 5, 10, and 14 days after the intervention.ConclusionThe applied cramp training induced a long-term CTF increase of 14 days.© 2016 International Neuromodulation Society.

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