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Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Differences?
J Strength Cond Res. 2018 Apr; 32(4):902-910.JS

Abstract

Fatela, P, Reis, JF, Mendonca, GV, Freitas, T, Valamatos, MJ, Avela, J, and Mil-Homens, P. Acute neuromuscular adaptations in response to low-intensity blood flow restricted exercise and high-intensity resistance exercise: are there any differences? J Strength Cond Res 32(4): 902-910, 2018-Numerous studies have reported similar neuromuscular adaptations between low-intensity (LI) blood-flow restricted exercise (BFRE) and high-intensity (HI) resistance training. Unfortunately, none of these experimental designs individualized blood flow restriction (BFR) levels to each participant. Thus, their findings are difficult to interpret. We aimed at comparing the acute effects of LI BFR (80% of absolute vascular occlusion pressure) with LI non-BFR and HI training on muscle torque, activation, and neuromuscular fatigue. Ten men (23.8 ± 5.4 years) exercised at 20 and 75% of 1 repetition maximum with and without BFR (for LI). Blood flow restriction pressure was determined individually using resting blood-flow measurements. Torque was determined during maximal voluntary contractions (MVCs) at pre-exercise and postexercise time points. Surface electromyographic activity (root mean square [RMS] and median frequency [MF]) was recorded for the rectus femoris (RF) and vastus medialis (VM) muscles, before and after each session of training, during isometric contractions at 20% MVC. Torque decreased post-HI and LI BFR (-9.5 and -7.8%, respectively; p < 0.01), but not after LI non-BFR. The MF was reduced following HI training in the VM and the RF muscles (-5.3 and -12.5%, respectively; p ≤ 0.05). Conversely, the impact of LI BFR on reducing MF was limited to the RF muscle (-10.7%, p ≤ 0.05). Finally, when compared to all other conditions, RMS values were consistently higher during submaximal contractions performed after HI training (p ≤ 0.05). Thus, we conclude that, despite enhancing the acute magnitude of muscular activation and fatigue, LI BFR exercise exerts a less profound impact on neuromuscular function than HI resistance training.

Authors+Show Affiliations

CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal.CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal. European University, Laureate International Universities, Lisbon, Portugal.CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal.CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal.CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal.European University, Laureate International Universities, Lisbon, Portugal. Neuromuscular Research Center, Department of Biology and Physical Activity, University of Jyvaskyla, Jyvaskyla, Finland.CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal.

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

29570594

Citation

Fatela, Pedro, et al. "Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Differences?" Journal of Strength and Conditioning Research, vol. 32, no. 4, 2018, pp. 902-910.
Fatela P, Reis JF, Mendonca GV, et al. Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Differences? J Strength Cond Res. 2018;32(4):902-910.
Fatela, P., Reis, J. F., Mendonca, G. V., Freitas, T., Valamatos, M. J., Avela, J., & Mil-Homens, P. (2018). Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Differences? Journal of Strength and Conditioning Research, 32(4), 902-910. https://doi.org/10.1519/JSC.0000000000002022
Fatela P, et al. Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Differences. J Strength Cond Res. 2018;32(4):902-910. PubMed PMID: 29570594.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Differences? AU - Fatela,Pedro, AU - Reis,Joana F, AU - Mendonca,Goncalo V, AU - Freitas,Tomás, AU - Valamatos,Maria J, AU - Avela,Janne, AU - Mil-Homens,Pedro, PY - 2018/3/24/entrez PY - 2018/3/24/pubmed PY - 2018/8/28/medline SP - 902 EP - 910 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 32 IS - 4 N2 - Fatela, P, Reis, JF, Mendonca, GV, Freitas, T, Valamatos, MJ, Avela, J, and Mil-Homens, P. Acute neuromuscular adaptations in response to low-intensity blood flow restricted exercise and high-intensity resistance exercise: are there any differences? J Strength Cond Res 32(4): 902-910, 2018-Numerous studies have reported similar neuromuscular adaptations between low-intensity (LI) blood-flow restricted exercise (BFRE) and high-intensity (HI) resistance training. Unfortunately, none of these experimental designs individualized blood flow restriction (BFR) levels to each participant. Thus, their findings are difficult to interpret. We aimed at comparing the acute effects of LI BFR (80% of absolute vascular occlusion pressure) with LI non-BFR and HI training on muscle torque, activation, and neuromuscular fatigue. Ten men (23.8 ± 5.4 years) exercised at 20 and 75% of 1 repetition maximum with and without BFR (for LI). Blood flow restriction pressure was determined individually using resting blood-flow measurements. Torque was determined during maximal voluntary contractions (MVCs) at pre-exercise and postexercise time points. Surface electromyographic activity (root mean square [RMS] and median frequency [MF]) was recorded for the rectus femoris (RF) and vastus medialis (VM) muscles, before and after each session of training, during isometric contractions at 20% MVC. Torque decreased post-HI and LI BFR (-9.5 and -7.8%, respectively; p < 0.01), but not after LI non-BFR. The MF was reduced following HI training in the VM and the RF muscles (-5.3 and -12.5%, respectively; p ≤ 0.05). Conversely, the impact of LI BFR on reducing MF was limited to the RF muscle (-10.7%, p ≤ 0.05). Finally, when compared to all other conditions, RMS values were consistently higher during submaximal contractions performed after HI training (p ≤ 0.05). Thus, we conclude that, despite enhancing the acute magnitude of muscular activation and fatigue, LI BFR exercise exerts a less profound impact on neuromuscular function than HI resistance training. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/29570594/Acute_Neuromuscular_Adaptations_in_Response_to_Low_Intensity_Blood_Flow_Restricted_Exercise_and_High_Intensity_Resistance_Exercise:_Are_There_Any_Differences L2 - http://dx.doi.org/10.1519/JSC.0000000000002022 DB - PRIME DP - Unbound Medicine ER -