Key result
Simulated sailing (hiking) resulted in a lower increase in vastus lateralis blood flow index compared to cycling at equivalent cardiac outputs.
Why the study?
Does isometric exercise during simulated sailing restrict quadriceps muscle blood flow compared to cycling at equivalent cardiac outputs in national-squad sailors?
Does isometric exercise during simulated sailing restrict quadriceps muscle blood flow compared to cycling at equivalent cardiac outputs in national-squad sailors?
Reduced quadriceps muscle oxygen availability during simulated sailing (hiking) is likely due to restricted muscle blood flow in the isometrically acting muscles.
Answers are grounded in this paper and cite their sources.
May indicate blood flow restriction during isometric sailing postures; hypothesis-generating for sailor training and performance.
In this study, we wished to determine whether the observed reduction in quadriceps muscle oxygen availability, reported during repetitive bouts of isometric exercise in simulated sailing efforts (i.e. hiking), is because of restricted muscle blood flow. Six national-squad Laser sailors initially performed three successive 3-min hiking bouts followed by three successive 3-min cycling tests sustained at constant intensities reproducing the cardiac output recorded during each of the three hiking bouts. The blood flow index (BFI) was determined from assessment of the vastus lateralis using near-infrared spectroscopy in association with the light-absorbing tracer indocyanine green dye, while cardiac output was determined from impedance cardiography. At equivalent cardiac outputs (ranging from 10.3±0.5 to 14.8±0.86 L · min(-1)), the increase from baseline in vastus lateralis BFI across the three hiking bouts (from 1.1±0.2 to 3.1±0.6 nM · s(-1)) was lower (P = 0.036) than that seen during the three cycling bouts (from 1.1±0.2 to 7.2±1.4 nM · s(-1)) (Cohen's d: 3.80 nM · s(-1)), whereas the increase from baseline in deoxygenated haemoglobin (by ∼17.0±2.9 μM) (an index of tissue oxygen extraction) was greater (P = 0.006) during hiking than cycling (by ∼5.3±2.7 μM) (Cohen's d: 4.17 μM). The results suggest that reduced vastus lateralis muscle oxygen availability during hiking arises from restricted muscle blood flow in the isometrically acting quadriceps muscles.
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Vogiatzis et al. (2011) studied Healthy volunteers (national-squad Laser sailors) (n=6). Simulated sailing efforts (hiking) vs. Cycling tests at equivalent cardiac outputs was evaluated on Increase from baseline in vastus lateralis blood flow index (BFI) (Cohen's d: 3.80 nM · s(-1), p=0.036). Simulated sailing (hiking) resulted in a lower increase in vastus lateralis blood flow index compared to cycling at equivalent cardiac outputs.
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