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- Title
The effect of eccentric exercise with blood flow restriction on neuromuscular activation, microvascular oxygenation, and the repeated bout effect.
- Authors
Lauver, Jakob; Cayot, Trent; Rotarius, Timothy; Scheuermann, Barry; Lauver, Jakob D; Cayot, Trent E; Scheuermann, Barry W
- Abstract
<bold>Purpose: </bold>To examine the effect of low-intensity eccentric contractions with and without blood flow restriction (BFR) on microvascular oxygenation, neuromuscular activation, and the repeated bout effect (RBE).<bold>Methods: </bold>Participants were randomly assigned to either low-intensity (LI), low-intensity with BFR (LI-BFR), or a control (CON) group. Participants in LI and LI-BFR performed a preconditioning bout of low-intensity eccentric exercise prior to about of maximal eccentric exercise. Participants reported 24, 48, 72, and 96 h later to assess muscle damage and function. Surface electromyography (sEMG) and near-infrared spectroscopy (NIRS) were used to measure neuromuscular activation and microvascular deoxygenation (deoxy-[Hb + Mb]) and [total hemoglobin] ([THC]) during the preconditioning bout, respectively.<bold>Results: </bold>During set-2, LI-BFR resulted in greater activation of the VM-RMS (47.7 ± 11.5% MVIC) compared to LI (67.0 ± 20.0% MVIC), as well as during set-3 (p < 0.05). LI-BFR resulted in a greater change in deoxy-[Hb + Mb] compared to LI during set-2 (LI-BFR 13.1 ± 5.2 µM, LI 6.7 ± 7.9 µM), set-3 (LI-BFR 14.6 ± 6 µM, LI 6.9 ± 7.4 µM), and set-4 (p < 0.05). [THC] was higher during LI-BFR compared to LI (p < 0.05). All groups showed a decrease in MVIC torque immediately after maximal exercise (LI 74.2 ± 14.1%, LI-BFR 75 ± 5.1%, CON 53 ± 18.6%). At 24, 48, 72, and 96 h post maximal eccentric exercise, LI and LI-BFR force deficit was not different from baseline.<bold>Conclusion: </bold>This study suggests that the neuromuscular and deoxygenation (i.e., metabolic stress) responses were considerably different between LI and LI-BFR groups; however, these differences did not lead to improvements in the RBE inferred by performing LI and LI-BFR.
- Subjects
EXERCISE physiology; MUSCLE contraction; BLOOD flow; BLOOD circulation; NEUROMUSCULAR system; BLOOD-vessel physiology; MYALGIA; SKELETAL muscle physiology; COMPARATIVE studies; EXERCISE; RESEARCH methodology; MEDICAL cooperation; RESEARCH; THERAPEUTICS; EVALUATION research; RANDOMIZED controlled trials; OXYGEN consumption; SKELETAL muscle; PREVENTION
- Publication
European Journal of Applied Physiology, 2017, Vol 117, Issue 5, p1005
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-017-3589-x