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Increase in Brain-Derived Neurotrophic Factor After Cycling Exercise Resisting Electrically Stimulated Antagonist
Takahiro Sugimoto1, Ryuki Hashida1, Sohei Iwanaga1
1Division of Rehabilitation, Kurume University Hospital, Kurume, JPN.
Background:
A hybrid training system (HTS) combining antagonist muscle electrical stimulation and voluntary muscle contraction has been developed using electrically stimulated eccentric antagonist muscle contractions. The exercise method that combines a conventional cycle ergometer with HTS (HERG) adds additional exercise intensity to the conventional cycle ergometer through electrical stimulation. Exercise-induced brain-derived neurotrophic factor (BDNF) production appears to have neuroprotective effects and contributes to improved metabolic regulation. Changes in BDNF after exercise are related to exercise intensity. Therefore, combining a cycle ergometer with electrical stimulation may be an effective approach.
Purpose:
The purpose of this study was to evaluate the effect of the HERG on BDNF secretion.
Participants And Methods:
Fourteen healthy adults participated in the study. The participants performed two types of exercise at the anaerobic threshold: HERG and a cycling ergometer alone (CERG). A comparative study using a 2×2 crossover method was conducted to examine the differences in BDNF and lactate levels after HERG and CERG. A linear mixed model was used to compare changes in BDNF between HERG and CERG.
Results:
Both HERG and CERG significantly increased BDNF and lactate levels after exercise. In overweight individuals with a BMI of 25 or higher, the change in BDNF levels after HERG was significantly greater than after CERG [ΔBDNF: 5500.96±7965.83 ng/ml, 1921.29±5308.22 ng/ml, respectively; p=0.0339]. There was no significant difference in the change in lactate levels after exercise between HERG and CERG (p=0.8632).
Conclusion:
In overweight individuals, HERG increased post-exercise serum BDNF levels more than ergometer exercise alone, despite the exercise intensity remaining the same at the anaerobic threshold. The exercise method that combines the HERG may be a useful form of exercise for overweight individuals.
