Respiratory limitation can be a primary mechanism for exercise cessation in female athletes. This study aimed to assess the effects of inspiratory loading (IL) on intercostal muscles (IM), vastus lateralis (VL) and cerebral (Cox) muscles oxygenation in women soccer players during high-intensity dynamic exercise. Ten female soccer players were randomized to perform in order two constant-load tests on a treadmill until the exhaustion time (Tlim) (100 % of maximal oxygen uptake- ${\dot{\mathrm{V}}\mathrm{O}}_2$). They breathed freely or against a fixed inspiratory loading (IL) of 41 cm H₂O (∼30 % of maximal inspiratory pressure). Oxygenated (Δ[OxyHb]), deoxygenated (Δ[DeoxyHb]), total hemoglobin (Δ[tHb]) and tissue saturation index (ΔTSI) were obtained by NIRs. Also, blood lactate [La^—] was obtained. IL significantly reduced Tlim (224 ± 54 vs 78 ± 20; P < 0.05) and increased [La^—], ${\dot{\mathrm{V}}\mathrm{O}}_2$, respiratory cycles and dyspnea when corrected to Tlim (P < 0.05). IL also resulted in decrease of Δ[OxyHb] of Cox and IM during exercise compared with rest condition. In addition, decrease of Δ[OxyHb] was observed on IM during exercise when contrasted with Sham (P < 0.05). Furthermore, significant higher Δ[DeoxyHb] of IM and significant lower Δ[DeoxyHb] of Cox were observed when IL was applied during exercise in contrast with Sham (P < 0.05). These results were accompanied with significant reduction of Δ[tHb] and ΔTSI of IM and VL when IL was applied (P < 0.05). High-intensity exercise with IL decreased respiratory and peripheral muscle oxygenation with negative impact on exercise performance. However, the increase in ventilatory work did not impact cerebral oxygenation in soccer players.

呼吸受限可能是女运动员停止运动的主要机制。本研究旨在评估吸气负荷 (IL) 对女足球运动员在高强度动态运动期间的肋间肌 (IM)、股外侧肌 (VL) 和大脑 (Cox) 肌肉氧合的影响。10 名女足球运动员被随机分配在跑步机上按顺序进行两次恒定负荷测试，直到力竭时间 (Tlim)（最大摄氧量的 100% -${\dot{\mathrm{伏}}\mathrm{哦}}_2$）。他们自由呼吸或在固定吸气负荷 (IL) 41 cm H ₂ O（最大吸气压力的~30% ）下呼吸。通过 NIR 获得含氧 (Δ[OxyHb])、脱氧 (Δ[DeoxyHb])、总血红蛋白 (Δ[tHb]) 和组织饱和指数 (ΔTSI)。此外，获得血乳酸[La ^- ]。IL 显着降低 Tlim (224 ± 54 vs 78 ± 20; P < 0.05) 并增加 [La ^— ]，${\dot{\mathrm{伏}}\mathrm{哦}}_2$，当校正到 Tlim 时，呼吸周期和呼吸困难（P < 0.05）。与休息条件相比，IL 还导致运动期间 Cox 和 IM 的 Δ[OxyHb] 降低。此外，与假手术相比，运动期间 IM 上观察到 Δ[OxyHb] 减少（P < 0.05）。此外，与假手术相比，当在运动期间应用 IL 时，观察到显着更高的 IM Δ[DeoxyHb] 和显着更低的 Cox Δ[DeoxyHb]（P < 0.05）。当应用IL时，这些结果伴随着IM和VL的Δ[tHb]和ΔTSI的显着降低（P < 0.05）。IL 的高强度运动会降低呼吸和外周肌肉氧合，对运动表现产生负面影响。然而，通气工作的增加并没有影响足球运动员的脑氧合。