Repetitive temporal interference stimulation improves jump performance but not the postural stability in young healthy males: a randomized controlled trial

• Published in: Journal of neuroengineering and rehabilitation Vol. 21; no. 1; p. 38
• Main Authors: Zheng, Suwang, Fu, Tianli, Yan, Jinlong, Zhu, Chunyue, Li, Lu, Qian, Zhenyu, Lü, Jiaojiao, Liu, Yu
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 20.03.2024; BioMed Central; BMC
• Subjects: Adult; Athletic ability; Balance; Body height; Brain; Brain research; Brain stimulation; Deep brain stimulation; Dynamic stability; Electric fields; Humans; Interference; Intervention; Jumping; Lower Extremity; Lower limbs motor function; Male; Males; Motor ability; Motor task performance; Muscle, Skeletal - physiology; Non-invasive brain stimulation; Physiological aspects; Physiological research; Postural stability; Posture; Psychological aspects; Research Design; Stimulation; Temporal interference stimulation; Testing; Variance analysis; Vertical jump; Young men; China; Non-invasive brain stimulation; Vertical jump; Postural stability; Temporal interference stimulation; Lower limbs motor function
• ISSN: 1743-0003; 1743-0003
• DOI: 10.1186/s12984-024-01336-7

Temporal interference (TI) stimulation, an innovative non-invasive brain stimulation technique, has the potential to activate neurons in deep brain regions. The objective of this study was to evaluate the effects of repetitive TI stimulation targeting the lower limb motor control area (i.e., the M1 leg area) on lower limb motor function in healthy individuals, which could provide evidence for further translational application of non-invasive deep brain stimulation. In this randomized, double-blinded, parallel-controlled trial, 46 healthy male adults were randomly divided into the TI or sham group. The TI group received 2 mA (peak-to-peak) TI stimulation targeting the M1 leg area with a 20 Hz frequency difference (2 kHz and 2.02 kHz). Stimulation parameters of the sham group were consistent with those of the TI group but the current input lasted only 1 min (30 s ramp-up and ramp-down). Both groups received stimulation twice daily for five consecutive days. The vertical jump test (countermovement jump [CMJ], squat jump [SJ], and continuous jump [CJ]) and Y-balance test were performed before and after the total intervention session. Two-way repeated measures ANOVA (group × time) was performed to evaluate the effects of TI stimulation on lower limb motor function. Forty participants completed all scheduled study visits. Two-way repeated measures ANOVA showed significant group × time interaction effects for CMJ height (F = 8.858, p = 0.005) and SJ height (F = 6.523, p = 0.015). The interaction effect of the average CJ height of the first 15 s was marginally significant (F = 3.550, p = 0.067). However, there was no significant interaction effect on the Y balance (p > 0.05). Further within-group comparisons showed a significant post-intervention increase in the height of the CMJ (p = 0.004), SJ (p = 0.010) and the average CJ height of the first 15 s (p = 0.004) in the TI group. Repetitive TI stimulation targeting the lower limb motor control area effectively increased vertical jump height in healthy adult males but had no significant effect on dynamic postural stability.