الإنتاج البحثي لأعضاء هيئة التدريس بالكلية V.8 - Flipbook - Page 168
190 ± 9 cm, and weight 90 ± 10 kg) rowed on an ergometer at a targeted heart rate of 130 and 160
beats per minute. SV was derived from arterial pressure waveform by pulse contour analysis, while
ventilation and force on the handle were measured. Mean arterial pressure was elevated during the
stroke at both work rates (to 133 ± 10 [P < .001] and 145 ± 11 mm Hg [P = .024], respectively).
Also, SV fluctuated markedly during the stroke with deviations being largest at the higher work
rate. Thus, SV decreased by 27 ± 10% (31 ± 11 mL) at the beginning of the stroke and increased
by 25 ± 9% (28 ± 10 mL) in the recovery (P = .013), while breathing was entrained with one breath
during the drive of the stroke and one prior to the next stroke. These observations indicate that
during rowing cardiac output depends critically on SV surges during the recovery phase of the
stroke
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