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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Acute ascorbic acid and hindlimb skeletal muscle blood flow distribution in old rats: Rest and exercise
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Acute ascorbic acid and hindlimb skeletal muscle blood flow distribution in old rats: Rest and exercise

机译:老年大鼠急性抗坏血酸和后肢骨骼肌血流分布:休息和运动

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Excess reactive oxygen species are implicated in the impaired peripheral vascular function evident during exercise in older individuals. We tested the hypothesis that an acute infusion of the antioxidant ascorbic acid (AA) in old rats would improve antioxidant capacity and reduce oxidative stress and, therefore, elevate hindlimb muscle blood flow at rest and during treadmill exercise in muscles containing principally type I and IIa muscle fibers. Total and individual hindlimb skeletal muscle blood flow was measured (radiolabeled microspheres) in old rats (26-28 months) at rest (n = 8) and during treadmill exercise (n = 8; 20 m·min-1, 5% grade) before and after AA treatment (76 mg·(kg body mass)-1 intra-arterial (i.a.) injection). AA elevated total antioxidant capacity (rest, ~37%; and exercise, 31%) and reduced oxidative stress (~26%, exercise only). AA reduced resting total hindlimb muscle blood flow (control, 25 ± 3; AA, 16 ± 2 mL·min-1·(100 g)-1; p 0.05) and blood flow to 8 of 28 individual muscles with no fiber-type correlation (p 0.05). During exercise there was no effect of AA on total hindlimb muscle blood flow (control, 154 ± 14; AA, 162 ± 13 mL·min-1·(100 g)-1; p 0.05) or blood flow to any individual muscle. This disconnect between whole-body antioxidant status and skeletal muscle blood flow in old rats mandates consideration when pursuing antioxidant treatments experimentally or clinically in older populations.
机译:年龄较大的人在运动过程中,明显存在过量的活性氧与周围血管功能受损有关。我们测试了以下假设:在老龄大鼠中急性输注抗氧化剂抗坏血酸(AA)会提高抗氧化能力并降低氧化应激,因此会增加静止状态和跑步机运动期间主要包含I型和IIa型肌肉的后肢肌肉血流量肌肉纤维。在休息(n = 8)和跑步机运动(n = 8; 20 m·min-1,5%等级)的老年大鼠(26-28个月)中,测量了全部和单个后肢骨骼肌的血流量(放射性标记的微球)。 AA治疗前后(76 mg·(kg体重)-1动脉内(ia)注射)。 AA提高了总抗氧化能力(休息,约占37%;运动,占31%),减少了氧化应激(约占26%,仅运动)。 AA减少了后肢的静止总后肢肌肉血流(对照组,25±3; AA,16±2 mL·min-1·(100 g)-1; p <0.05),血液流向28根无纤维的单支肌肉类型相关性(p> 0.05)。运动期间,AA对后肢的总血流没有影响(对照组,154±14; AA,162±13 mL·min-1·(100 g)-1; p> 0.05),也没有影响任何单个肌肉的血流。在老年人群中进行实验性或临床性抗氧化剂治疗时,老年大鼠的全身抗氧化剂状态与骨骼肌血流之间的这种脱节成为必须考虑的因素。

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