IF 1 4区医学

Biorheology Pub Date : 2025-05-01 Epub Date: 2024-10-29 DOI: 10.1177/0006355X241290980

Emine Kilic-Toprak, Guzin Fidan Yaylali, Yasin Ozdemir, Senay Topsakal, Ozgen Kilic-Erkek, Burak Oymak, Melek Bor-Kucukatay

{"title":"Blood rheology and systemic oxidative status in patients with acromegaly.","authors":"Emine Kilic-Toprak, Guzin Fidan Yaylali, Yasin Ozdemir, Senay Topsakal, Ozgen Kilic-Erkek, Burak Oymak, Melek Bor-Kucukatay","doi":"10.1177/0006355X241290980","DOIUrl":"10.1177/0006355X241290980","url":null,"abstract":"BackgroundCardiovascular system is known to be affected in acromegaly. However, it was not reported to date if hemorheology was also altered and there is limited data regarding systemic oxidative status in patients with acromegaly.ObjectiveTo investigate alterations in hemorheology and systemic oxidative stress in patients with acromegaly.MethodsThe study comprised 19 active (AA) and 15 controlled (CA) acromegaly patients (n = 34, mean age 48.85 ± 1.69 years) and 29 controls (mean age 52.83 ± 1.37 years). Erythrocyte aggregation index (AI), aggregation half time (t½), amplitude (Amp) and erythrocyte elongation index (EI) were determined by an ektacytometer. Commercial kits were used for measuring serum total oxidant status (TOS) and total antioxidant status (TAS), and oxidative stress index (OSI) was calculated.ResultsThere were statistically significant differences regarding EI at shear stresses of 16.87 ve 30.00 Pa (p = 0.034, p = 0.0001, respectively) and AI (p = 0.050, p = 0.035, respectively) values among the control, AA and CA groups. Decrement of t½ was in line with increment of AI and indicated increased erythrocyte aggregation. Serum TOS, TAS and OSI values were similar between the control, AA and CA groups (p > 0.05).ConclusionsThis pilot study demonstrated reduced erythrocyte deformability and increased erythrocyte aggregation in patients with AA and CA.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":" ","pages":"31-37"},"PeriodicalIF":1.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143456964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of adhesive strength between the epidermal and inner tissues of plant stems using a tensile tester. 用拉力试验机测定植物茎的表皮和内部组织之间的粘接强度。

IF 1 4区医学

Biorheology Pub Date : 2025-05-01 Epub Date: 2025-02-21 DOI: 10.1177/0006355X241296333

Yuma Shimizu, Kazuyuki Wakabayashi, Kensuke Miyamoto, Kouichi Soga

{"title":"Measurement of adhesive strength between the epidermal and inner tissues of plant stems using a tensile tester.","authors":"Yuma Shimizu, Kazuyuki Wakabayashi, Kensuke Miyamoto, Kouichi Soga","doi":"10.1177/0006355X241296333","DOIUrl":"https://doi.org/10.1177/0006355X241296333","url":null,"abstract":"BackgroundThe plant stem is composed of epidermal and inner tissues that are under tension and compression, respectively. Therefore, the adhesion of both tissues is considered to be involved in the structural integrity of the stem. However, the role of tissue adhesion in stem structure is unclear.ObjectiveThis study aimed to develop a method for quantitatively measuring the adhesive strength between the epidermal and inner tissues using a tensile tester to determine the possible role of tissue adhesion in stem integrity.MethodsThe epidermal tissue was partially peeled from the segment of pea epicotyls using forceps to create a peeling arm. The peeling arm and the segment region of the partially removed epidermal tissue were fixed to the upper and lower clamps, respectively. By raising the upper clamp at various speeds, the epidermal tissue was peeled from the segment, and the peeling force was recorded.ResultsAdhesive strength was defined as the peeling force normalized by the width of the peeled epidermal tissue. The peeling rate was determined as 100 mm/min. The adhesive strength in the elongation region of the stem was substantially smaller than in the non-elongation region.ConclusionsA method for quantitatively measuring the adhesive strength between the epidermal and inner tissues was developed. Analysis using this method suggests that adhesive strength may be involved in regulating stem growth.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":"60 1-2","pages":"23-30"},"PeriodicalIF":1.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144109658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impact of measurement techniques and common effectors on red blood cell aggregation. 测量技术和常见效应物对红细胞聚集的影响。

IF 1 4区医学

Biorheology Pub Date : 2025-05-01 Epub Date: 2024-12-22 DOI: 10.1177/0006355X241297017

Kaitlyn Chien, Honglei Liu, Silvie Suriany, Jon A Detterich

{"title":"The impact of measurement techniques and common effectors on red blood cell aggregation.","authors":"Kaitlyn Chien, Honglei Liu, Silvie Suriany, Jon A Detterich","doi":"10.1177/0006355X241297017","DOIUrl":"10.1177/0006355X241297017","url":null,"abstract":"BackgroundRed blood cell aggregation is largely influenced by hematocrit and plasma protein content with aggregation increasing as hematocrit and fibrinogen increase. Aggregation measurement techniques include light-transmission or laser-backscatter, and the impact of measurement technique on aggregation measurements with respect to changes in hematocrit and plasma protein is not well understood.ObjectiveThe objective of this study was to evaluate aggregation measurement techniques with respect to common effectors of red blood cell aggregation.MethodsWe obtained whole blood samples from 10 healthy participants and varied hematocrit, plasma albumin, and plasma fibrinogen concentration in a sample of healthy male and female participants. We then measured red blood cell aggregation using a Myrenne Aggregometer (light-transmission aggregometer) and a Laser Optical Rotational Red Cell Analyzer (laser-backscatter aggregometer).ResultsFor Myrenne, aggregation increased from 30% to 40% hematocrit, then declined at 50% hematocrit. Measurement in the LORRCA demonstrated an increase as hematocrit increased from 30% to 40%, and again increased at 50%, which differed from the light transmission method. Red blood cell aggregation increased with increased fibrinogen concentration, but did not change significantly as albumin concentration increased.ConclusionsRed blood cell aggregation is expected to increase as hematocrit increases, but when light transmission aggregometry is used, aggregation decreases as hematocrit increases past 40%. Each measurement technique has its own set of methodological strengths and weaknesses.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":" ","pages":"19-22"},"PeriodicalIF":1.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143456973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Examination of hemorheological and exerkine concentrations at four-week whole body vibration exercise in obese women: A pilot study. 检查血液流变学和运动浓度在四周全身振动运动肥胖妇女：一个试点研究。

IF 1 4区医学

Biorheology Pub Date : 2025-05-01 Epub Date: 2025-03-28 DOI: 10.1177/0006355X251330982

Emine Kilic-Toprak, Fatma Unver, Yasin Ozdemir, Ebru Tekin, Busra Emik, Hilal Seymanur Binbir, Aysegul Cort, Melek Bor-Kucukatay

{"title":"Examination of hemorheological and exerkine concentrations at four-week whole body vibration exercise in obese women: A pilot study.","authors":"Emine Kilic-Toprak, Fatma Unver, Yasin Ozdemir, Ebru Tekin, Busra Emik, Hilal Seymanur Binbir, Aysegul Cort, Melek Bor-Kucukatay","doi":"10.1177/0006355X251330982","DOIUrl":"https://doi.org/10.1177/0006355X251330982","url":null,"abstract":"Background: Obesity can result in increased visceral adipose tissue, insulin resistance, and impaired fasting glucose. Objective: The aim of the study was to investigate the acute and chronic effects of whole body vibration exercise (WBVE) on erythrocyte deformability, plasma viscosity, total oxidant/antioxidant status (TOS/TAS), oxidative stress index (OSI) and serum exerkine levels in obese women.Methods: The study included 13 obese women (mean age 41.32 ± 5.26 years, BMI 34.18 ± 1.67 kg/m2). Participants performed exercises using a vibration device for 12 sessions. Erythrocyte deformability (ektacytometry), plasma viscosity (rotational viscometry), plasma TOS/TAS, OSI and serum irisin, visfatin and resistin concentrations (ELISA) were evaluated. Blood samples were collected before and after the exercise at the first and fourth weeks.Results: Erythrocyte deformability values were increased after single session of WBVE at shear stress of 0.30 and 9.49 Pa and decreased after single session of WBVE at shear stress of 16.87 and 30 Pa (p < 0.05) at the first week. However, after 4 weeks of WBVE, erythrocyte deformability at 0.30 and 0.53 Pa increased; TOS, OSI and plasma viscosity were all decreased (p < 0.05). Serum irisin and resistin levels significantly increased after 4 weeks of WBVE (p < 0.05), whereas visfatin did not show statistically significant changes (p > 0.05).Conclusions: Four weeks of WBVE significantly improved the erythrocyte deformability, oxidative stress, plasma viscosity, and serum levels of irisin and resistin in obese women.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":"60 1-2","pages":"38-47"},"PeriodicalIF":1.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144109657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biomechanical changes in abdominal aortic aneurysms involve a prolonged post-failure phase. 腹主动脉瘤的生物力学变化涉及较长的衰竭后阶段。

IF 1 4区医学

Biorheology Pub Date : 2025-05-01 Epub Date: 2025-03-24 DOI: 10.1177/0006355X251323815

Dimitrios P Sokolis

{"title":"Biomechanical changes in abdominal aortic aneurysms involve a prolonged post-failure phase.","authors":"Dimitrios P Sokolis","doi":"10.1177/0006355X251323815","DOIUrl":"https://doi.org/10.1177/0006355X251323815","url":null,"abstract":"BackgroundPrevious studies characterizing the tensile strength of abdominal aortic aneurysms (AAAs) have disregarded the post-failure phase during which rupture propagates.ObjectiveTo identify aneurysm-induced changes in the post-failure phase of the intact infra-renal aortic wall, examining its three layers.MethodsWe analyzed ex vivo tensile tests on tissues from 27 AAA patients and 27 age-matched autopsy subjects.ResultsThe failure stress of the intact wall circumferentially and the intimal failure stress in both circumferential and longitudinal directions were significantly lower (p < 0.05) in AAAs than in non-aneurysmal aortas (NAAs). Failure stretch showed no significant changes. However, the pre-failure stretches of the intact wall and media circumferentially were higher (p < 0.05) in AAAs, as were the post-failure stretches of the intact wall and media in both directions and the adventitia circumferentially. The pre-extensions of the media and adventitia were also higher (p < 0.05) when coupled to the intact wall.ConclusionsThe study demonstrates an earlier onset of damage in AAAs and a strength decrease, indicating weakening. The medial and adventitial layers contribute more in determining AAA intact-wall properties. Their greater capacity for post-failure stretch may delay rupture progression outward, preserving the integrity of the entire aortic thickness despite initiation in the weakened intima.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":"60 1-2","pages":"3-18"},"PeriodicalIF":1.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144109651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Abstracts of the 2nd Annual Conference of the Austrian Society for Rheology. 奥地利流变学学会第二届年会摘要。

IF 1.1 4区医学

Biorheology Pub Date : 2024-03-12 DOI: 10.3233/BIR-239001

引用次数: 0

Abstracts of the 2nd Annual Conference of the Austrian Society for Rheology. 奥地利流变学学会第二届年会摘要。

IF 1.1 4区医学

Biorheology Pub Date : 2024-03-12 DOI: 10.3233/BIR-239002

引用次数: 0

HIIT serves as an efficient training strategy for basketball players by improving blood fluidity and decreasing oxidative stress 通过改善血液流动性和减少氧化应激，HIIT 成为篮球运动员的高效训练策略

IF 1.1 4区医学

Biorheology Pub Date : 2024-03-05 DOI: 10.3233/bir-230024

Riza Altinel, Ozgen Kilic-Erkek, Emine Kilic-Toprak, Bayram Ozhan, Ahmet Yildirim, Melek Bor-Kucukatay

{"title":"HIIT serves as an efficient training strategy for basketball players by improving blood fluidity and decreasing oxidative stress","authors":"Riza Altinel, Ozgen Kilic-Erkek, Emine Kilic-Toprak, Bayram Ozhan, Ahmet Yildirim, Melek Bor-Kucukatay","doi":"10.3233/bir-230024","DOIUrl":"https://doi.org/10.3233/bir-230024","url":null,"abstract":"BACKGROUND:A challenge for coaches and athletes is to find the best combination of exercises during training. Considering its favorable effects, HIIT has been very popular recently. OBJECTIVE:The goal of this study was to investigate anthropometric features, performance, erythrocyte deformability,plasma viscosity (PV) and oxidative stress in response to acute and long-term (6 weeks) HIIT in adolescent basketball players. METHODS:22 sportsmen between the ages of 14–16 were included. Tabata protocol was applied to the HIIT group in addition to their routine training program 3 days/week, for 6 weeks. Erythrocyte deformability was determined using an ectacytometer (LORCA), PV with a rotational viscometer. Total oxidant status (TOS), total antioxidant status (TAS) were measured by kits. RESULTS:HIIT for 6 weeks induced an improvement in performance tests and waist circumference. 6 weeks of HIIT resulted in a decrement, while the last exercise session yielded an increment in RBC deformability. PV and TOS of HIIT groups were decreased on the 6th week. CONCLUSIONS:Our results demonstrate that, HIIT in addition to the routine exercise program is beneficial for improving performance and blood fluidity as well as decreasing oxidative stress in basketball players. Therefore, HIIT seems as an efficient training strategy for highly-trained individuals.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":"63 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140070283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The rheology of interactions between leukocytes, platelets and the vessel wall in thrombo-inflammation 血栓性炎症中白细胞、血小板和血管壁之间相互作用的流变学原理

IF 1.1 4区医学

Biorheology Pub Date : 2024-02-02 DOI: 10.3233/bir-230040

Gerard B. Nash

{"title":"The rheology of interactions between leukocytes, platelets and the vessel wall in thrombo-inflammation","authors":"Gerard B. Nash","doi":"10.3233/bir-230040","DOIUrl":"https://doi.org/10.3233/bir-230040","url":null,"abstract":"Leukocytes and platelets must adhere to the wall of blood vessels to carry out their protective functions in inflammation and haemostasis. Recruitment is critically dependent on rheological variables (wall shear rate and stress, red cell aggregation and haematocrit) which affect delivery to the vessel wall as well as velocities and forces experienced there. Leukocyte recruitment is efficient only up to wall shear rates of about 300 s−1 and usually restricted to low-shear post-capillary venules in inflammation. Being smaller, platelets experience lower velocities and shear forces adjacent to the wall and can adhere at much higher shear rates for haemostasis in arteries. In addition, we found quite different effects of variations in haematocrit or red cell aggregation on attachment of neutrophils or platelets, which also assist their separate recruitment in venules or arteries. However, it has become increasingly evident that inflammatory and thrombotic responses may occur together, with platelets promoting the adhesion and activation of neutrophils and monocytes. Indeed, it is 30 years since we demonstrated that platelets could cause neutrophils to aggregate in suspension and, when attached to a surface, could support selectin-mediated rolling of all leukocytes. Thrombin-activated platelets could further induce neutrophil activation and immobilisation. In some conditions, platelets could bind to intact endothelial monolayers and capture neutrophils or monocytes. Subsequently, we found that extracellular vesicles released by activated platelets (PEV) fulfilled similar functions when deposited on surfaces or bound to endothelial cells. In murine models, platelets or PEV could act as bridges for monocytes in inflamed vessels. Thus, leukocytes and platelets are rheologically adapted for their separate functions, while novel thrombo-inflammatory pathways using platelets or PEV may underlie pathogenic leukocyte recruitment.","PeriodicalId":9167,"journal":{"name":"Biorheology","volume":"21 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140069867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Poiseuille Gold Medal Awardee 2023. 2023 年 Poiseuille 金奖获得者。

IF 1.1 4区医学

Biorheology Pub Date : 2024-01-01 DOI: 10.3233/BIR-240006

Herbert H Lipowsky, Brian M Cooke

引用次数: 0

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