Institute of Health Science and Graduate School of Human-Environment Studies, Kyushu University, Kasuga, Fukuoka, Japan.
Eur J Appl Physiol. 2011 Oct;111(10):2601-6. doi: 10.1007/s00421-011-1880-9. Epub 2011 Mar 5.
Visual performance is impaired when the ocular blood flow decreases, indicating that ocular blood flow plays a role in maintaining visual performance during exercise. We examined the ocular blood flow response to incremental cycling exercise to test the hypothesis that ocular blood flow is relatively stable during dynamic exercise because of its autoregulatory nature. The blood flow in the inferior and superior temporal retinal arterioles (ITRA and STRA, respectively) and retinal and choroidal vessels (RCV), mean arterial pressure, and heart rate (HR) were measured at rest and during leg cycling in nine young and healthy subjects (26 ± 5 years, mean ± SD). Ocular blood flow was measured by laser speckle flowmetry. The exercise intensity was incremented by 30 W every 3 min until the subject was unable to maintain a position appropriate for measuring ocular blood flow. Blood flow data obtained during cycling exercise were categorized based on HR as follows: <100, 100-120, and >120 bpm. Blood flow in the RCV increased with the exercise intensity: by 16 ± 8, 32 ± 13, and 40 ± 19% from baseline, respectively. However, blood flow and vascular conductance in the ITRA and STRA did not change significantly with exercise. These findings demonstrate for the first time that ocular blood flow increases in the retina and choroid, but not in the arterioles, with increasing exercise intensity during dynamic exercise.
当眼球血流减少时，视觉表现会受到损害，这表明眼球血流在运动过程中对维持视觉表现起着重要作用。我们检查了眼球血流对递增性踏车运动的反应，以检验以下假说：由于其自身调节特性，眼球血流在动态运动中相对稳定。在 9 名年轻健康受试者（26±5 岁，均值±标准差）休息和腿部踏车运动期间，测量了下方和上方颞视网膜动脉（ITRA 和 STRA）和视网膜脉络膜血管（RCV）的血流、平均动脉压和心率（HR）。通过激光散斑流速测量法测量眼球血流。运动强度每 3 分钟增加 30W，直到受试者无法保持适合测量眼球血流的位置。根据 HR 将在踏车运动期间获得的血流数据分类如下：<100、100-120 和>120bpm。RCV 中的血流随运动强度增加：分别比基线增加 16±8、32±13 和 40±19%。然而，ITRA 和 STRA 的血流和血管传导性在运动过程中没有明显变化。这些发现首次表明，在动态运动中，随着运动强度的增加，视网膜和脉络膜中的眼球血流增加，但动脉中的血流没有增加。
