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Purpose <p>Blood flow restriction (BFR) is a resistance training technique that enhances muscle adaptation and strength gains under hypoxic conditions. However, its impact on motor unit (MU) coordination remains unclear. This study investigated how BFR influences intra- and inter-muscular common drives to MUs in two functional agonists during a static precision pinch task.</p> Methods <p>Eighteen adults (23.9 ± 1.3&#xa0;years; nine men, nine women) performed a thumb–index finger precision pinch under BFR and non-BFR conditions, while force fluctuation dynamics and MU activities in the flexor pollicis brevis (FPB) and first dorsal interosseous (FDI) were analyzed.</p> Results <p>The results revealed a significant reduction in maximal voluntary contraction following BFR application (<i>p</i> = 0.003). In addition, BFR significantly increased force fluctuations (<i>p</i> = 0.007), potentiated discharge variability (<i>p</i> = 0.018), and strengthened force–discharge coupling specifically in the FPB (<i>p</i> = 0.010). BFR increased the mean recruitment threshold of motor units in the FDI (<i>p</i> &lt; 0.001), but not in the FPB (<i>p</i> &gt; 0.05) during finger precision pinch. Intra-muscular common drive increased within the FDI (<i>p</i> &lt; 0.001) and FPB (<i>p</i> &lt; 0.001), whereas inter-muscular common drive between agonist MUs decreased (<i>p</i> &lt; 0.001).</p> Conclusion <p>BFR application disrupts force precision stability and neuromuscular coordination between functional agonists during precision pinch. It increases global discharge variability and intra-muscular MU synchrony. However, the resulting force fluctuations are only partially compensated by reduced inter-muscular MU synchrony, offering limited coordination flexibility among agonists.</p>

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Blood flow restriction modulates common drive to motor units and force precision: implications for neuromuscular coordination

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Chia-Chan Wu,
  • Yen-Ting Lin,
  • Yueh Chen,
  • Yi-Ching Chen,
  • Ing-Shiou Hwang

摘要

Purpose

Blood flow restriction (BFR) is a resistance training technique that enhances muscle adaptation and strength gains under hypoxic conditions. However, its impact on motor unit (MU) coordination remains unclear. This study investigated how BFR influences intra- and inter-muscular common drives to MUs in two functional agonists during a static precision pinch task.

Methods

Eighteen adults (23.9 ± 1.3 years; nine men, nine women) performed a thumb–index finger precision pinch under BFR and non-BFR conditions, while force fluctuation dynamics and MU activities in the flexor pollicis brevis (FPB) and first dorsal interosseous (FDI) were analyzed.

Results

The results revealed a significant reduction in maximal voluntary contraction following BFR application (p = 0.003). In addition, BFR significantly increased force fluctuations (p = 0.007), potentiated discharge variability (p = 0.018), and strengthened force–discharge coupling specifically in the FPB (p = 0.010). BFR increased the mean recruitment threshold of motor units in the FDI (p < 0.001), but not in the FPB (p > 0.05) during finger precision pinch. Intra-muscular common drive increased within the FDI (p < 0.001) and FPB (p < 0.001), whereas inter-muscular common drive between agonist MUs decreased (p < 0.001).

Conclusion

BFR application disrupts force precision stability and neuromuscular coordination between functional agonists during precision pinch. It increases global discharge variability and intra-muscular MU synchrony. However, the resulting force fluctuations are only partially compensated by reduced inter-muscular MU synchrony, offering limited coordination flexibility among agonists.