The kinetics of blood rheology during and after prolonged standardized exercise

Ernst, Edzard; Daburger, L.; Saradeth, T.

doi:10.3233/ch-1991-11520

Cited by 30 publications

(28 citation statements)

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“…In general, blood circulation is reduced during sports activities, because the volume of plasma decreases and blood hematocrit increases (4). Blood hematocrit decreases after doing sports exercises because of the increase in plasma volume (32). Hematocrit is one of the main determinants of blood viscosity (4).…”

Section: Resultsmentioning

confidence: 99%

Effects of Circuit Resistance Training with Crocus Sativus (Saffron) Supplementation on Plasma Viscosity and Fibrinogen

Ghanbari–Niaki

Saeidi

Aliakbari

et al. 2015

Ann. Appl. Sport Sci

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BSTRACTA limited number of studies has been carried out concerning the combined effects of resistance training and saffron supplementation on cardiovascular risk factors. The aim of this study was to assess the effects of circuit resistance training with Crocus sativus (saffron) supplementation on plasma viscosity and fibrinogen. For this purpose, 44 healthy male subjects, based on individual characteristics and after homogenization, were divided into four groups, including water-training (WT; n=11), petal sweat-training (PST; n=10), bottom part of flower-training (BFT; n=11), and upper part of flower-training (UFT; n=12). Resistance training consisted of 12 stations (each station for 30 seconds with 40% of one repetition maximum) for 2 weeks (5 sessions per week). Saffron in the amount of 500 mg was used twice daily, i.e. in the morning and immediately after exercise. Blood samples were taken before and 48 hours after the last exercise session and were analyzed for fibrinogen and plasma viscosity. Significant differences were observed between groups in plasma levels of fibrinogen (P=0.01). The post hoc test showed significant differences between the UFT and PST groups and the UFT and BFT groups (respectively, P=0.04 and P=0.014). In the post-test, plasma fibrinogen had significantly decreased in the WT (P=0.005), PWT (P=0.003), and UFT (P=0.001) groups compared with pre-test data (within group difference). Moreover, plasma viscosity was significantly changed among groups (F3, 37=3.52, P=0.024). The post hoc test showed significant differences between the UFT and WT groups (P=0.037). In post-test data, plasma viscosity had significantly decreased in the WT (P=0.015) and UFT (P<0.001) groups compared with pre-test data. The present results show that circuit resistance training with saffron supplements can reduce cardiovascular risk factors (fibrinogen and plasma viscosity).

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Section: Resultsmentioning

confidence: 99%

Effects of Circuit Resistance Training with Crocus Sativus (Saffron) Supplementation on Plasma Viscosity and Fibrinogen

Ghanbari–Niaki

Saeidi

Aliakbari

et al. 2015

Ann. Appl. Sport Sci

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“…When sedentary or endurance trained subjects perform short-duration maximal or submaximal exercise (mainly cycling), plasma viscosity usually increases by up to 5-10% at the end of the exercise, when compared with resting values [13,23,34,36,81]. This increase contributes, with the other blood rheological changes, to the increase of blood viscosity at a given shear rate during exercise.…”

Section: Plasma Viscositymentioning

confidence: 99%

“…The effects of acute exercise on RBC deformability have been examined in several studies, with most reporting a decrease [13,36,38,61,67,97,98]. This decrease may contribute to the rise in blood viscosity during exercise.…”

Section: Red Blood Cell Deformabilitymentioning

confidence: 99%

“…In addition, several studies reported association between RBC aggregation abnormalities and diseases, probably as a consequence of inflammation and/or metabolic disturbances, such as in primary open-angle glaucoma [56], type 2 diabetes [75], insulin resistance [15,16], sickle cell disease [49,83,93] and others [32,48,58,79,95]. Few studies have investigated RBC aggregation in response to exercise and contrasting results have been reported: some studies described no change [25,84,89], an increase, in association or not with a rise in plasma fibrinogen level [18,36,84], or a delayed decrease [98] with exercise. Such findings should be considered in the context that in vitro assessment of RBC aggregation is typically performed on blood samples adjusted to standardised hematocrit (usually 40%); increased hematocrit observed during exercise likely increases RBC aggregation in vivo due to an increased cell-cell contact.…”

Section: Red Blood Cell Aggregationmentioning

confidence: 99%

“…Whereas acute exercise may increase blood viscosity at a given shear rate, chronic exercise (endurance or resistance exercise) usually results in a decrease [12,46,68]. Following a cessation of exercise (few hours or few days later), there is an increase in plasma volume [12] which represents a reversal of the acute hyperviscosity observed during acute exercise, resulting in an "autohemodilution" [35,36]. The repetition of exercise during consecutive days leads to a chronic "autohemodilution" resulting in a low baseline hematocrit -low baseline viscosity patterns [12,35,46].…”

Section: Healthy Populationmentioning

confidence: 99%

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Exercise hemorheology: Classical data, recent findings and unresolved issues

Connes

Simmonds

Brun

et al. 2013

Clinical Hemorheology and Microcirculation

125

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The present review focuses on the past and recent knowledge in the field of exercise hemorheology and presents some unresolved issues for opening discussion. Acute exercise is associated with a rise in hematocrit which results in an increase in blood viscosity. Whereas increased blood viscosity was previously viewed as having negative consequences for cardiovascular function and aerobic performance, recent findings suggest dynamic changes in blood viscosity might be useful for vascular function during exercise by increasing nitric oxide production. Other determinants of blood viscosity are altered by exercise (e.g., decreased red blood cell deformability, increased red blood cell aggregation and plasma viscosity) and may, independent of the associated effect on blood viscosity, directly modulate aerobic capacity. However, the data published on the effects of exercise on the hemorheology are not consistent, with some studies showing decreased, unchanged, or increased red blood cell deformability/aggregation when compared with rest. These discrepancies seem to be related to the exercise protocol investigated, the population tested or the methodogy utilized for hemorheological measurements. Finally, this review focuses on the effects of exercise training (i.e. chronic physical activity) on the hemorheological profile of healthy individuals and patients with cardiovascular and metabolic disorders. P. Connes et al. / Blood rheology and exerciseaddress classical findings in exercise hemorheology and will present new directions. In addition, some unresolved issues will be presented for opening discussion. Acute effects of exercise on hemorheology and relationships with performance2.1. Blood viscosity P. Connes et al. / Blood rheology and exercise 189 PRE 90 Blood viscosity (mPa/s) POST 90 POST 225 5 6 7 8 9

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