Increased Hemoglobin Mass and VO2max With 10 h Nightly Simulated Altitude at 3000 m

2013 ◽  
Vol 8 (4) ◽  
pp. 366-372 ◽  
Author(s):  
Mitsuo Neya ◽  
Taisuke Enoki ◽  
Nao Ohiwa ◽  
Takashi Kawahara ◽  
Christopher J. Gore
Keyword(s):  
Oxygen Consumption ◽  
Confidence Interval ◽  
Total Dose ◽  
Transferrin Receptor ◽  
Soluble Transferrin Receptor ◽  
Simulated Altitude ◽  
Maximum Oxygen Consumption ◽  
Hemoglobin Mass ◽  
And Control ◽  
Serum Erythropoietin

Purpose:To quantify the changes of hemoglobin mass (Hbmass) and maximum oxygen consumption (VO2max) after 22 days training at 1300–1800 m combined with nightly exposure to 3000-m simulated altitude. We hypothesized that with simulated 3000-m altitude, an adequate beneficial dose could be as little as 10 h/24 h.Methods:Fourteen male collegiate runners were equally divided into 2 groups: altitude (ALT) and control (CON). Both groups spent 22 days at 1300–1800 m. ALT spent 10 h/night for 21 nights in simulated altitude (3000 m), and CON stayed at 1300 m. VO2max and Hbmass were measured twice before and once after the intervention. Blood was collected for assessment of percent reticulocytes (%retics), serum erythropoietin (EPO), ferritin, and soluble transferrin receptor (sTfR) concentrations.Results:Compared with CON there was an almost certain increase in absolute VO2max (8.6%, 90% confidence interval 4.8–12.6%) and a likely increase in absolute Hbmass (3.5%; 0.9–6.2%) at postintervention. The %retics were at least very likely higher in ALT than in CON throughout the 21 nights, and sTfR was also very likely higher in the ALT group until day 17. EPO of ALT was likely higher than that of CON on days 1 and 5 at altitude, whereas serum ferritin was likely lower in ALT than CON for most of the intervention.Conclusions:Together the combination of the natural and simulated altitude was a sufficient total dose of hypoxia to increase both Hbmass and VO2max.

Increased serum erythropoietin but not red cell production after 4 wk of intermittent hypobaric hypoxia (4,000–5,500 m)

2006 ◽  
Vol 101 (5) ◽  
pp. 1386-1393 ◽  
Author(s):  
Christopher J. Gore ◽  
Ferran A. Rodríguez ◽  
Martin J. Truijens ◽  
Nathan E. Townsend ◽  
James Stray-Gundersen ◽  
...  
Keyword(s):  
Transferrin Receptor ◽  
Hypobaric Hypoxia ◽  
Soluble Transferrin Receptor ◽  
Double Blind ◽  
Hypoxia Exposure ◽  
Intermittent Hypobaric Hypoxia ◽  
Collegiate Level ◽  
Norm Group ◽  
Hemoglobin Mass ◽  
Serum Erythropoietin

This study tested the hypothesis that athletes exposed to 4 wk of intermittent hypobaric hypoxia exposure (3 h/day, 5 days/wk at 4,000–5,500 m) or double-blind placebo increase their red blood cell volume (RCV) and hemoglobin mass (Hbmass) secondary to an increase in erythropoietin (EPO). Twenty-three collegiate level athletes were measured before (Pre) and after (Post) the intervention for RCV via Evans blue (EB) dye and in duplicate for Hbmassusing CO rebreathing. Hematological indexes including EPO, soluble transferrin receptor, and reticulocyte parameters were measured on 8–10 occasions spanning the intervention. The subjects were randomly divided among hypobaric hypoxia (Hypo, n = 11) and normoxic (Norm, n = 12) groups. Apart from doubling EPO concentration 3 h after hypoxia there was no increase in any of the measures for either Hypo or Norm groups. The mean change in RCV from Pre to Post for the Hypo group was 2.3% (95% confidence limits = −4.8 to 9.5%) and for the Norm group was −0.2% (−5.7 to 5.3%). The corresponding changes in Hbmasswere 1.0% (−1.3 to 3.3%) for Hypo and −0.3% (−2.6 to 3.1%) for Norm. There was good agreement between blood volume (BV) from EB and CO: EB BV = 1.03 × CO BV + 142, r2= 0.85, P < 0.0001. Overall, evidence from four independent techniques (RCV, Hbmass, reticulocyte parameters, and soluble transferrin receptor) suggests that INTERMITTENT HYPOBARIC HYPOXIA EXPOSURE did not accelerate erythropoiesis despite the increase in serum EPO.

scholarly journals The Impact of Aerobic Training on Some Brain Neurotransmitters and Brain-Derived Neurotrophic Factor in Addicted Women

2021 ◽  
Vol 28 (1) ◽  
pp. 13-18
Author(s):  
Arezoo Koohestani ◽  
Mehrdad Fathi ◽  
Keyvan Hejazi
Keyword(s):  
Quality Of Life ◽  
Oxygen Consumption ◽  
Neurotrophic Factor ◽  
Aerobic Training ◽  
Brain Derived Neurotrophic Factor ◽  
Maximum Oxygen Consumption ◽  
Fat Percentage ◽  
Brain Neurotransmitters ◽  
And Control

Abstract Introduction. Addiction is a chronic disease that needs time-consuming treatment. The medicines used to stop or reduce the tendency have not been successful so far. The purpose of this study was to investigate the effect of six weeks of aerobic training (morning and afternoon) on some brain neurotransmitters, brain-derived neurotrophic factor and quality of life in addicted females. Material and Methods. Thirty subjects were selected and divided into intervention (n = 15) and control (n = 15) groups. The aerobic training program consisted of six weeks of aerobic training, 3 sessions per week, and each session lasted for 45 to 60 minutes with a maximum intensity of 50-70% of the maximum heart rate. Paired sample t-test and ANCOVA were used to compare between- and within-group variance changes. Results. Weight levels, body mass index and body fat percentage significantly decreased (p < 0.05), while the serum levels of serotonin, dopamine and brain-derived neurotrophic factor (BDNF) increased significantly. The maximum oxygen consumption and quality of life increased significantly at the end of the period. Changes in intra-group mean in weight, body mass index, body fat percentage, dopamine, BDNF, maximum oxygen consumption, physical limitation, general health, vitality, social activity, physical and emotional function and life satisfaction are significantly different between experimental and control groups (p < 0.05). Conclusions. Six-week aerobic training performed in the morning and afternoon reduces body composition indicators and increases brain neurotransmitters, quality of life and maximum oxygen consumption in addicted females. Therefore, it can be effective in improving physical and mental health.

SOLUBLE TRANSFERRIN RECEPTOR IS A PROMISING MARKER of IRON DEFICIENCY ANEMIA IN PREVALENT HEMODIALYSIS PATIENTS

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Khaled Abou seif ◽  
Hussien Sayed Hussien ◽  
Shaimaa Abdelmegied ◽  
Marwa Abdulhady
Keyword(s):  
Iron Deficiency ◽  
Iron Deficiency Anemia ◽  
Transferrin Receptor ◽  
Iron Status ◽  
Hemodialysis Patients ◽  
Deficiency Anemia ◽  
P Value ◽  
Soluble Transferrin Receptor ◽  
Significant Difference ◽  
And Control

Abstract: Background Diagnosis of iron deficiency is traditionally based on ferritin and other iron parameters becomes difficult in end stage renal disease patients due to the inflammatory condition which affects these markers and masks the iron deficiency. Serum soluble transferrin receptor (sTfR) is able to be a reliable indicator for assessing iron status, as it is not affected by inflammatory procedures. Aim To evaluate the usefulness of serum soluble transferrin receptors in iron deficiency anemia detection in comparison to the classic markers of iron status in prevalent hemodialysis patients. Methods This case-control study assessed sTfR in 80 prevalent ESRD patients on regular hemodialysis in 2 groups. Group A (N = 40): CRP &gt;10 and group B (N = 40):CRP &lt;10 and apparently healthy 8 control subjects. Results The cut of value of STFRs in hemodialysis patients was 12.5 mg\l. The prevalence of STFRs in patients with CRP&lt;10 was 85%, while in patients with CRP&gt;10 was 92.5% (P-value 0.288). STFRs have high sensitivity 88.75, specificity 100, PPV100% and NPV 47.1%. The hemodialysis patients who have elevated STFRs have risk 1.22 times to have iron deficiency anemia if CRP &lt;10 (odds ratio: 1.22) and 3.14 times if CRP&gt;10 (odds ratio: 3.14). There was significant difference on comparing patients with CRP&lt;10, CRP&gt;10 and control as regard Hb and STFR with P-value 0.0001 and 0.0001 respectively. Post Hoc analysis showed significant difference in both between the patients with CRP&lt;10 and control also in patients with CRP&gt;10 and control (p value &lt;0.0001). while on comparing patients with CRP&lt;10 with patients with CRP&gt;10 there was significant difference in STFRs p value 0.0001 despite no significant difference in hemoglobin (p value 0.642) and classic marker of iron deficiency (s.iron, TIBC, TSAT) with p value 0.701,0.192,0.382 respectively. Serum STFRs was negatively correlated with s.iron and Kt\v (r -0.372, P-value 0.018) and (r-0.416, p value 0.008) respectively in patients with CRP &lt;10. Conclusion Serum soluble transferrin receptor is highly sensitive and specific marker for iron deficiency in hemodialysis patients especially in patients with high CRP level.

MO789SERUM SOLUBLE TRANSFERRIN RECEPTOR IS A PROMISING  MARKER OF IRON DEFICIENCY ANEMIA IN PREVALENT HEMODIALYSIS PATIENTS

2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
Khaled Abouseif ◽  
Hussein Abdallah ◽  
Marwa Abdulhady ◽  
Shaimaa Zaki abdelmegied
Keyword(s):  
Iron Deficiency ◽  
Iron Deficiency Anemia ◽  
Transferrin Receptor ◽  
Hemodialysis Patients ◽  
Deficiency Anemia ◽  
P Value ◽  
Soluble Transferrin Receptor ◽  
Significant Difference ◽  
And Control ◽  
Esrd Patients

Abstract Background and Aims End stage renal disease (ESRD) is chronic inflammatory condition which affects iron parameters. Serum soluble transferrin receptor (sTfR) is a reliable indicator for assessing iron status in inflammatory conditions. This study evaluates the usefulness of serum sTfR in iron deficiency anemia detection in prevalent hemodialysis patients. Method This case-control study included 40 ESRD patients on conventional hemodialysis with CRP&gt;10, 40 ESRD patients with CRP&lt;10 and 8 apparently healthy controls. Serum sTfR was measured for all patients and controls. Results STFRs predicts iron deficiency anemia in prevalent hemodialysis patients at cut off value 12.5 mg/l with area under curve 0.949, sensitivity 88.75, specificity 100, PPV 100% and NPV 47.1%. The prevalence of STFRs in patients with CRP&lt;10 was 85%, while in patients with CRP&gt;10 was 92.5% (P-value 0.288). Patients who have elevated STFRs have risk 1.22 times to have iron deficiency anemia if CRP &lt;10 (odds ratio: 1.22) and 3.14 times if CRP&gt;10 (odds ratio: 3.14). There was significant difference on comparing patients with CRP&lt;10, CRP&gt;10 and control as regard haemoglobin and STFR with P-value 0.0001 and 0.0001 respectively. Post Hoc analysis showed significant difference between the patients with CRP&lt;10 and control also in patients with CRP&gt;10 and control as regard haemoglobin and STFR (p value &lt;0.0001). on comparing patients with CRP&lt;10 with patients with CRP&gt;10 there was significant difference in STFRs p value 0.0001 despite no significant difference in haemoglobin (p value 0.642) and classic iron markers (s.iron, TIBC, TSAT) with p value 0.701, 0.192, 0.382 respectively. Serum STFRs was negatively correlated with s.iron and Kt\v in patients with CRP &lt;10 (r -0.372, P-value 0.018) and (r-0.416, p value 0.008) respectively. Conclusion Serum soluble transferrin receptor is a highly sensitive and specific marker of iron deficiency anemia in hemodialysis patients especially with high CRP level.

CARDIORESPIRATORY SYSTEM UNDER BICYCLE ERGOMETER TEST IN SKIERS WITH DIFFERENT TRAINING STATUS (KOMI REPUBLIC)

2019 ◽  
pp. 76-84
Author(s):  
Yu.G. Solonin ◽  
T.P. Loginova ◽  
I.O. Garnov ◽  
A.L. Markov ◽  
A.A. Chernykh ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Komi Republic ◽  
Rate Pressure Product ◽  
Training Status ◽  
Maximum Oxygen Consumption ◽  
Bicycle Ergometry ◽  
Cardiorespiratory System ◽  
Unit Pulse ◽  
Ski Racers

The aim of the study is to examine the impact of training status on ski racers (Komi Republic) at rest and under bicycle ergometry evaluating their cardiorespiratory system parameters. Materials and Methods. The authors examined male ski racers with different training status: 22 first-rank sportsmen, 22 candidates for Master of Sports and 22 Masters of Sports. Athletes underwent bicycle ergometry loads up to refusal. Oxycon Pro system (Germany) was used. Then authors studied the complex of cardiorespiratory parameters, calculating maximum oxygen consumption and unit physiological cost. Results. At rest and under standard physical load (200 W) Masters of Sports demonstrate significantly increased training status among ski racers in such cardiorespiratory system parameters as heart rate, rate pressure product and oxygen pulse. Under standard physical load (200 W) statistically significant differences between first-rank sportsmen and candidates for Master of Sports are detected by heart rate, rate pressure product, respiration rate, respiratory minute volume and oxygen utilization coefficient. Such deviations indicate differences in training status. Under maximum load, the highest training status is found in Masters of Sports: bicycle ergometry load power and duration; unit pulse, pressor and cardiac cost, bulk and unit values of maximum oxygen consumption. Heart rate values, unit pulse and heart-vent cost indicate a high training status in candidates for Master of Sports under load up to refusal, if compared with first-rank sportsmen. Athletes’ organism under load up to refusal works more efficiently than under moderate load (200 W). The training status in ski racers (Komi Republic) is manifested in the saving cardiorespiratory system functions, both at rest and under standard bicycle ergometry, as well as in parameters of unit physiological cost under loads up to refusal and increased values of maximum oxygen consumption. Keywords: ski racers, Komi Republic, training status, bicycle ergometry loads, cardiorespiratory system, maximum oxygen consumption.

scholarly journals Zumba®, Fat Mass and Maximum Oxygen Consumption: A Systematic Review and Meta-Analysis

2020 ◽  
Vol 18 (1) ◽  
pp. 105
Author(s):  
Manuel Chavarrias ◽  
Santos Villafaina ◽  
Ana Myriam Lavín-Pérez ◽  
Jorge Carlos-Vivas ◽  
Eugenio Merellano-Navarro ◽  
...  
Keyword(s):  
Systematic Review ◽  
Oxygen Consumption ◽  
Body Mass ◽  
Fat Mass ◽  
Evidence Synthesis ◽  
Meta Analysis ◽  
P Value ◽  
Maximum Oxygen Consumption ◽  
Mass Percentage ◽  
Large Heterogeneity

Background and objectives: Obesity or overweight is associated with many health risk factors and preventable mortality. Even people with normal weight and without history of obesity or overweight should avoid weight gain to reduce health risks factors. In this regard Latin aerobic dances involved in Zumba® practice make this modality motivating for people. Apart from weight loss and VO2peak benefits, Zumba practice is also interesting by the increase in adherence which can also avoid weight regain. The aim was to systematically review the scientific literature about the effects of any randomized intervention of Zumba® practice on total fat mass (%) and maximum oxygen consumption (VO2peak), besides establishing directions for the clinical practice. Evidence acquisition: Two systematic searches were conducted in two electronic databases following the PRISMA guidelines. The eligibility criteria were (a) outcomes: body mass or VO2peak data including mean and standard deviation (SD) before and after Zumba® intervention, (b) study design: randomized controlled trial (RCT) and (c) language: English. GRADE guidelines were used to assess the quality of evidence. A meta-analysis was performed to determine mean differences. Nine and four studies were selected for fat mass percentage and VO2peak in the systematic review, respectively. However, only eight studies for fat mass percentage and three for VO2peak could be included in the meta-analysis. Evidence synthesis: The overall standardized mean difference for fat mass was −0.25 with a 95% CI from −0.67 to 0.16 with a p-value of 0.69, with large heterogeneity. On the other hand, the overall effect size for VO2peak was 0.53 (95% CI from 0.04 to 1.02 with a p-value of 0.03) with large heterogeneity. Conclusions: Based on the evidence, we cannot conclude that Zumba® is effective at reducing body mass but it may improve VO2peak. However, the limited number of studies that met the inclusion criteria makes it too early to reach a definite conclusion, so more research is needed.

scholarly journals Effect of Fortification with Multiple Micronutrient Powder on the Prevention and Treatment of Iron Deficiency and Anaemia in Brazilian Children: A Randomized Clinical Trial

Nutrients ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 2160
Author(s):  
Malaine Morais Alves Machado ◽  
Mirella de Paiva Lopes ◽  
Raquel Machado Schincaglia ◽  
Paulo Sérgio Sucasas da Costa ◽  
Alexandre Siqueira Guedes Coelho ◽  
...  
Keyword(s):  
Iron Deficiency ◽  
Serum Ferritin ◽  
Transferrin Receptor ◽  
Ferrous Sulfate ◽  
Soluble Transferrin Receptor ◽  
Standard Drug ◽  
Micronutrient Powder ◽  
Prevention And Treatment ◽  
Multiple Micronutrient ◽  
Multiple Micronutrient Powder

Fortification with multiple micronutrient powder has been proposed as a public health intervention able to reduce micronutrient deficiencies in children. Our objective was to compare the effectiveness of fortification with multiple micronutrient powder with drug supplementation in the prevention and treatment of iron deficiency and anaemia. This was a cluster trial with anemic and non-anaemic children between six and 42 months old, in randomization data. Non anaemic children received fortification with multiple micronutrient powder or standard drug supplementation of ferrous sulfate associated with folic acid in a prevention dose. Anaemic children who were randomized to receive multiple micronutrient powder also received the recommended iron complementation for anaemia treatment. A total of 162 children were evaluated. The prevalence of anaemia decreased from 13.58 to 1.85%. Iron deficiency decreased from 21.74% to 7.89% (by serum ferritin) and iron deficiency decreased from 66.81 to 38.27% (by soluble transferrin receptor). No difference was identified between interventions for hemoglobin (p = 0.142), serum ferritin (p = 0.288), and soluble transferrin receptor (p = 0.156). Fortification with multiple micronutrient powder was effective in preventing iron deficiency and anaemia in children aged six to 48 months. In anaemic children; it was necessary to supplement the dose of multiple micronutrient powder with ferrous sulfate.

Sign in / Sign up

Export Citation Format

Share Document