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Year : 2023  |  Volume : 13  |  Issue : 1  |  Page : 65-71

Force generation and muscle activation of knee extensor and flexor muscles in type 2 diabetes mellitus patients

1 Department of Physical Therapy, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
2 Department of Nutrition and Movement Science, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands
3 Department of Physiotherapy, School of Rehabilitation, Tabriz University of Medical Science, Tabriz, Iran

Correspondence Address:
Farid Bahrpeyma
Jalal Aleahmad, Nasr, P. O. Box: 14115-111, Tehran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmss.jmss_129_21

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Background: Type 2 diabetes mellitus (T2DM) is associated with decreased muscle force generation. The disturbed force generation process in T2DM could be attributed to either or both agonist and antagonist muscles activation. The present study aims to assess the effects of T2DM on the interaction of antagonist and agonist muscles in the knee joint. Methods: The peak torque, root mean square (RMS) of the SEMG signals, the ratio of torque/RMS, and the interaction of antagonists and agonist muscles were compared between healthy and T2DM patients. Surface ElectroMyoGraphy (SEMG) of knee flexor and extensor muscles were recorded during concentric contraction with an isokinetic dynamometer at 60°/s in 13 T2DM and 12 healthy subjects. The independent sample t-tests were used to compare diabetic and healthy subjects. The significance level was set at 0.05. Results: The antagonist/agonist interaction during maximal extension (P = 0.010) and flexion (P = 0.022) torques of the knee joint showed significantly lower activation of antagonist muscles in T2DM patients than in healthy subjects. Lower knee flexion (41.3%) and extension torques (49.1%) and RMS of agonist and antagonist muscles were observed in T2DM. The torque/RMS ratio (P > 0.05) showed no significant differences in T2DM and healthy subjects. Conclusion: The reduced maximal knee flexor and extensor torques in T2DM are accompanied with the decreased myoelectric activity of corresponding muscles. The related mechanism could be attributed to lower values of antagonist/agonist interaction, which may point out some neural compensatory processes to preserve the functional capacity of the neuromuscular system in T2DM.

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