Forearm blood flow follows work rate during submaximal dynamic forearm exercise independent of sex.
Forearm blood flow follows work rate during submaximal dynamic forearm exercise independent of sex.
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在次最大动态前臂运动期间，前臂血流量遵循工作速率，与性别无关。
DOI：
10.1152/japplphysiol.00452.2007
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Scheuermann,BarryW
中科院分区：
文献类型：
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作者：
Gonzales,JoaquinU;Thompson,BenjaminC;Thistlethwaite,JohnR;Harper,AllisonJ;Scheuermann,BarryW
为了验证性别影响运动时前臂血流量（FBF）的假设，15名女性和16名男性年龄相似[女性24.3±4.0 (SD) vs男性24.9±4.5岁]，但前臂肌肉力量不同（女性290.7±44.4 N vs男性509.6±97.8 N；P< 0.05），在坡道函数中增加相同的绝对工作量（0.25 W/min）时进行动态握力锻炼。任务失败被定义为无法保持收缩速度。运动时分别用听诊和多普勒超声测量两臂血压和FBF。肌肉力量与耐力时间呈正相关（r= 0.72，P< 0.01），女性的任务失败时间比男性短（450.5±113.0 s比831.3±272.9 s，P< 0.05）。然而，在任务失败时达到最大握力的百分比在性别之间是相似的（14%最大自愿收缩）。在整个运动过程中和任务失败时，女性和男性的FBF相似（女性为13.6±5.3，男性为14.5±4.9 ml·min−1·100 ml−1）。女性在休息和运动时的平均动脉压较低；因此，女性在运动期间计算的前臂血管传导（FVC）较高，但在任务失败时两性之间相似（女性为0.13±0.05，男性为0.11±0.04 ml·min - 1·100 ml - 1·mmHg - 1）。综上所述，在运动过程中，女性的FVC比男性高，而MAP比男性低，从而获得了相似的FBF。尽管如此，无论性别如何，运动过程中FBF仍然与工作速率（可能是代谢需求）相关联。
To test the hypothesis that sex influences forearm blood flow (FBF) during exercise, 15 women and 16 men of similar age [women 24.3 ± 4.0 (SD) vs. men 24.9 ± 4.5 yr] but different forearm muscle strength (women 290.7 ± 44.4 vs. men 509.6 ± 97.8 N;P< 0.05) performed dynamic handgrip exercise as the same absolute workload was increased in a ramp function (0.25 W/min). Task failure was defined as the inability to maintain contraction rate. Blood pressure and FBF were measured on separate arms during exercise by auscultation and Doppler ultrasound, respectively. Muscle strength was positively correlated with endurance time (r= 0.72,P< 0.01) such that women had a shorter time to task failure than men (450.5 ± 113.0 vs. 831.3 ± 272.9 s;P< 0.05). However, the percentage of maximal handgrip strength achieved at task failure was similar between sexes (14% maximum voluntary contraction). FBF was similar between women and men throughout exercise and at task failure (women 13.6 ± 5.3 vs. men 14.5 ± 4.9 ml·min−1·100 ml−1). Mean arterial pressure was lower in women at rest and during exercise; thus calculated forearm vascular conductance (FVC) was higher in women during exercise but similar between sexes at task failure (women 0.13 ± 0.05 vs. men 0.11 ± 0.04 ml·min−1·100 ml−1·mmHg−1). In conclusion, the similar FBF during exercise was achieved by a higher FVC in the presence of a lower MAP in women than men. Still, FBF remained coupled to work rate (and presumably metabolic demand) during exercise irrespective of sex.