Abstract
Purpose
Determine whether unilateral low-intensity blood-flow restricted (LIBFR) exercise is as effective as high-intensity (HI) resistance training for improving contralateral muscle strength.
Methods
Thirty healthy adults (20–30 years) were randomly allocated to the following dynamic plantar-flexion training interventions: HI [75% of one-repetition maximum (1RM), 4 sets, 10 reps] and LIBFR [20% of 1RM, 4 sets, 30 + 15 + 15 + 15 reps]. Evoked V-wave and H-reflex recruitment curves, as well as maximal voluntary contraction (MVC) and panoramic ultrasound assessments of the trained and untrained soleus muscles were obtained pre-training, post-4 weeks of training and post-4 weeks of detraining.
Results
Both interventions failed to increase contralateral MVC and muscle cross-sectional area (CSA). Yet, contralateral rate of torque development (RTD) was enhanced by both regimens (12–26%) and this was accompanied by heightened soleus EMG within the first milliseconds of the rising torque-time curve (14–22%; p < 0.05). These improvements were dissipated after detraining. Contralateral adaptations were not accompanied by changes in V-wave or H-reflex excitability. Conversely, LIBFR and HI elicited a similar magnitude of ipsilateral increase in MVC, RTD and CSA post-training (10–18%). Improvements in V-wave amplitude and soleus EMG were limited to the trained leg assigned to LIBFR training (p < 0.05). While gains in strength and CSA remained preserved post-4 weeks of detraining, this did not occur with RTD.
Conclusion
Since gains in RTD were similar between interventions, our findings indicate that both training regimens can be used interchangeably for improving contralateral rapid torque production. Ultimately, this may be beneficial in circumstances of limb immobilization after injury or surgery.
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Availability of data and material
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- ANOVA:
-
Analysis of variance
- ARV:
-
Average rectified value
- BFR:
-
Blood flow restriction
- CSA:
-
Cross-sectional area
- EMG:
-
Electromyography
- ES:
-
Effect size
- HI:
-
High intensity
- Hmax :
-
Maximal H-reflex amplitude
- LI:
-
Low intensity
- Msup :
-
M-wave amplitude during supramaximal stimulation
- MVC:
-
Maximal voluntary contraction
- RM:
-
Repetition maximum
- RTD:
-
Rate of torque development
- SD:
-
Standard deviation
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Funding
This work was partly supported by the Fundação para a Ciência e Tecnologia, under Grants PTDC/DTP-DES/5714/2014 and UIDB/00447/2020 to CIPER—Centro Interdisciplinar para o Estudo da Performance Humana (unit 447).
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GVM designed the study with PPC, PMH and SRF. CT, ADG and CVC, together with GVM performed all the experiments. GVM, ADG, CT and CVC analyzed and interpreted the data. GVM and CVC wrote the manuscript.
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Mendonca, G.V., Vila-Chã, C., Teodósio, C. et al. Contralateral training effects of low-intensity blood-flow restricted and high-intensity unilateral resistance training. Eur J Appl Physiol 121, 2305–2321 (2021). https://doi.org/10.1007/s00421-021-04708-2
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DOI: https://doi.org/10.1007/s00421-021-04708-2