scholarly journals Diferencias en el OBLA en jugadoras de fútbol en relación a su posición en el campo de juego (Differences in OBLA in football players based on their field position)

Retos ◽  
2016 ◽  
pp. 58-61
Author(s):  
Jose E. Del Río Valdivia ◽  
Ciria Margarita Salazar ◽  
Julio Cuevas Romo ◽  
Adriana Isabel Andrade Sánchez ◽  
Pedro Julian Flores Moreno ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
P Value ◽  
Significance Level ◽  
Speed Test ◽  
Physiological Variables ◽  
Significant Difference ◽  
Speed Level ◽  
Field Position

La posición en el campo de juego en el fútbol, no obedece solo a un interés personal, sino que podría depender de variables fisiológicas individuales. El presente estudio determina el OBLA en las diferentes posiciones. La población del estudio fue integrada por 16 jugadoras universitarias de la modalidad soccer (4 por cada posición) evaluadas en una banda sin fin, con una prueba de velocidades crecientes. En cada velocidad utilizada se midió la concentración de lactato sanguíneo con un analizador portátil Accuntrend Lactate Plus. Para el análisis de los datos se propuso una fórmula matemática de interpolación entre las variables velocidad y concentración de lactato. Se encontró, una variación significativa del OBLA, en la muestra estudiada, dependiendo de la posición de juego (porteras, defensas, medio-campistas y delanteras). Utilizando la prueba de Kruskal-Wallis, con un nivel de significancia (α) del 5 %, en búsqueda de la relación entre el OBLA y la posición de las jugadoras, se obtuvo un p-valor de 0.004, por lo que no es posible aceptar la igualdad entre las poblaciones, por lo tanto, se puede afirmar que existe una diferencia estadística significativa cuando se compara el comienzo de acumulación de lactato en sangre (OBLA) con la posición en la que juegan las futbolistas. Los resultados demuestran que existen diferencias estadísticamente significativas entre los grupos de jugadoras de acuerdo a la posición que desempeñan en el campo de juego y a la concentración de lactato en sangre.Abstract. Choosing a field position in football may not depend only on personal interest, but also on individual physiological variables. The aim of the study is to determine the Onset of Blood Lactate Accumulation (OBLA) in the different field positions of football. The study sample was composed by 16 female players (four per position) evaluated using an increased speed test carried out on treadmill. At each speed level, blood lactate concentrations were measured with the portable analyzer Accuntrend Lactate Plus. A mathematical formula interpolating speed and lactate concentration was proposed for the analysis of the data obtained. A significant variation of OBLA was found in the participants, associated with playing position (goalkeepers, defenders, midfielders, and strikers). Setting the significance level (α) at 5%, a p-value of 0.004 was obtained using the Kruskal-Wallis test in order to study the relation between OBLA and players’ field position. This demonstrates that there is no equivalence among positions, at the same time as a statistically significant difference is shown when comparing OBLA with players’ field position. Results show that there are statistically significant differences between the groups of players based on their field position and on blood lactate concentration.

scholarly journals Lactate Clearance as a Predictive Marker of Mortality in Adult Intensive Care Unit

2020 ◽  
Vol 5 (2) ◽  
pp. 32-38
Author(s):  
Shirish Raj Joshi ◽  
Renu Gurung ◽  
Subhash Prasad Acharya ◽  
Bashu Dev Parajuli ◽  
Navindra Raj Bista
Keyword(s):  
Intensive Care Unit ◽  
Intensive Care ◽  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Lactate Clearance ◽  
Icu Mortality ◽  
Adult Intensive Care Unit ◽  
Icu Admission ◽  
Significant Difference

Introduction: Lactate clearance has been widely investigated. Serial lactate concentrations can be used to examine disease severity and predict mortality in the intensive care unit. We investigated the diagnostic accuracy of lactate concentration and lactate clearance in predicting mortality in critically ill patients during the first 24 hours in Intensive Care Unit (ICU).Methods: It was a Prospective, observational study conducted in ICU. Sixty eight consecutive patients having blood lactate level >2 mmol/L were included irrespective of disease and postoperative status. We measured blood lactate concentration at ICU admission(H0), at six hours(H6), 12 hours(H12), and 24 hours(H24). Lactate clearance was measured for H0-H6, H0-H12 and H0-H24 time period.Results: ICU mortality was 33.8%. Lactate clearance was 15.80 ± 17.21% in survivors and 1.73±11% in non survivors for the H0-H6 (p = 0.001) and remained higher in survivors than in non survivors over the study period of 24 hours; 17.97±15 vs. -2.04±19.84% for H0-H12 and 27.40 ± 11.41% vs. -14.83 ± 26.84% for the H0-H24 period (p < 0.001 for each studied period). There was significant difference in lactate concentration (static) between survivors and non survivors during the course of initial 24 hours. The best predictor of ICU mortality was lactate clearance for the H0-H24 period (AUC =0.89; 95% CI 0.78-1.01). Logistic regression found that H0-H24 lactate clearance was independently correlated to a survival status (p = 0.005, OR = 0.922 and 95% CI 0.871-0.976).Conclusion: Blood lactate concentration and lactate clearance are both predictive for mortality during initial 24 hours of ICU admission.

scholarly journals La privación de sueño no afecta la resistencia aeróbica ni la concentración de lactato en sangre de jóvenes deportistas (Sleep deprivation does not affect aerobic resistance or blood lactate concentration of young athletes)

Retos ◽  
2018 ◽  
pp. 221-223
Author(s):  
Jorge Alberto Aburto Corona ◽  
Tatiana Miranda Núñez ◽  
Alicia Bárcenas Ugalde ◽  
Roberto Espinoza Gutiérrez ◽  
Emilio Manuel Arrayales Millán
Keyword(s):  
Sleep Deprivation ◽  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Aerobic Performance ◽  
Control Group ◽  
Experimental Conditions ◽  
Male Athletes ◽  
Physical Test ◽  
Significant Difference

El objetivo de este estudio fue determinar si la resistencia aeróbica y la concentración de lactato en sangre, pueden ser influenciados por la privación parcial o total del sueño en un grupo de deportistas. Se reclutaron 13 deportistas masculinos (21.8 ± 2.9 años de edad) los cuales fueron sometidos a tres condiciones experimentales: dormir cuatro horas (D4H), no dormir (0H) y una condición contol de dormir ocho horas (D8H). No se encontraron diferencias estadísticamente significativas en la resistencia aeróbica (p=.845). De la misma manera, no se halló diferencia significativa en la concentración de lactato en sangre (p>.05). Estos resultados señalan que la privación parcial (dormir cuatro horas) o total (no dormir) del sueño, previo a una prueba física, no es un factor que influya en el rendimiento aeróbico ni en la concentración de lactato en sangre en comparación a la cantidad de horas de sueño recomendadas (dormir ocho horas).Abstract. The purpose of this study was to determinate if aerobic performance and blood lactate concentration are influenced by partial or total sleep deprivation. Thirteen male athletes (age: 21.8 ± 2.9 y.o) were randomly assigned to three experimental conditions: sleep four hours (D4H), no sleep (0H), and sleep eigth hours (D8H, control group). No significant difference was found in the aerobic performance (p=.845). Similarly, there was no sifnificant difference in blood lactate concentration (p>.05). This results suggest that partial (sleep four hours) or total (no sleep) sleep deprivation before a physical test are not a factor influencing aerobic performance or blood lactate concentration compared to the amount of recommended hours of sleep (sleep eight hours).

scholarly journals Metabolic and Cardiorespiratory Responses of Semiprofessional Football Players in Repeated Ajax Shuttle Tests and Curved Sprint Tests, and Their Relationship with Football Match Play

2020 ◽  
Vol 17 (21) ◽  
pp. 7745
Author(s):  
Tomasz Gabrys ◽  
Arkadiusz Stanula ◽  
Urszula Szmatlan-Gabrys ◽  
Michal Garnys ◽  
Luboš Charvát ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Test Performance ◽  
Pulmonary Ventilation ◽  
Lactate Concentration ◽  
Total Duration ◽  
Blood Lactate Concentration ◽  
Energy System ◽  
Football Players ◽  
Performance Decrement ◽  
Physiological Variables

In this study, the Ajax Shuttle Test (AST) and the Curved Sprint Test (CST) were conducted on semiprofessional football players to evaluate (1) their test performance, (2) the extent of anaerobic glycolysis by measuring blood lactate, (3) performance decrement and onset of fatigue, and (4) the correlation between selected physiological variables and test performance. Thirty-two semiprofessional Polish football players participated in this study. Both AST and CST were conducted on an outdoor football ground and were conducted in two sets; each set had six repetitions. In the case of AST, the total duration for 6 repetitions of the exercise in Sets 1 and 2 were 90.63 ± 3.71 and 91.65 ± 4.24 s, respectively, whereas, in the case of CST, the respective values were 46.8 ± 0.56 and 47.2 ± 0.66 s. Peak blood lactate concentration [La] after Sets 1 and 2 of AST were 14.47 ± 3.77 and 15.00 ± 1.85 mmol/L, and in the case of CST, the values were 8.17 ± 1.32 and 9.78 ± 1.35 mmol/L, respectively. Performance decrement in AST was more than in CST, both after Set 1 (4.32 ± 1.43 and 3.31 ± 0.96 in AST and CST, respectively) and Set 2 (7.95 ± 3.24 and 3.71 ± 1.02 in AST and CST, respectively). Only in a few of the repetitions, pulmonary ventilation (VE) and oxygen uptake (VO2) were found to be significantly correlated with the performance of the volunteers in both AST and CST. Respiratory exchange ratio (RER) was significantly correlated with most of the repetitions of AST, but not with CST. The study concludes that (1) AST shows more dependence on the anaerobic glycolytic system than shorter repetitive sprints (as in CST), (2) there is more performance decrement and fatigue in AST than in CST, and (3) early decrease in performance and fatigue in the semiprofessional football players in AST and CST may be due to the insufficiency of their aerobic energy system.

Metabolic and cardiovascular effects of infusions of low doses of isoprenaline in man

1988 ◽  
Vol 75 (3) ◽  
pp. 285-291 ◽  
Author(s):  
P. I. Mansell ◽  
I. W. Fellows ◽  
A. T. Birmingham ◽  
I. A. Macdonald
Keyword(s):  
Blood Pressure ◽  
Peak Plasma ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Metabolic Effects ◽  
Glycerol Concentration ◽  
Low Doses ◽  
Plasma Adrenaline ◽  
Physiological Variables ◽  
Significant Difference

1. The cardiovascular and metabolic responses to low doses of isoprenaline (15 and 5 ng min−1 kg−1 body weight infused over 30 min) were determined in six healthy males. The study was performed to investigate whether there were sustained effects after the termination of the isoprenaline infusions, as has been observed previously after the infusion of adrenaline. 2. The isoprenaline infusions produced dose-dependent increases in heart rate, systolic blood pressure and metabolic rate, but similar increases in calf blood flow and decreases in diastolic blood pressure for the two infusion rates. Finger tremor was increased in amplitude by the 15 ng min−1 kg−1 infusion only. The changes in each of these physiological variables largely resolved within a few minutes of discontinuing the isoprenaline infusions. 3. There were no changes in arterialized venous plasma adrenaline or noradrenaline levels during the isoprenaline infusions. Mean peak plasma isoprenaline levels were 0.16 ±0.02 nmol/l during the 5 ng min−1 kg−1 infusion and 0.71 ±0.05 nmol/l during the 15 ng min−1 kg−1 infusion. 4. Plasma insulin levels increased with isoprenaline but blood glucose concentrations were unchanged, consistent with a direct effect of isoprenaline on β2-adrenoceptors mediating insulin release from pancreatic β-cells. Blood glycerol concentration also increased with isoprenaline but blood lactate concentration was unaltered. 5. The present study demonstrates pronounced cardiovascular and metabolic effects of low dose isoprenaline infusions. Differences in the rate of resolution of the changes induced by isoprenaline and by adrenaline seen in previous studies may result from a significant difference in their metabolism.

scholarly journals Physiological Response to Different Kata Performances

2021 ◽  
Vol 61 (1) ◽  
pp. 14-23
Author(s):  
Dušana Augustovičová ◽  
Radovan Hadža ◽  
Rastislav Štyriak ◽  
Peter Barinec
Keyword(s):  
Heart Rate ◽  
Blood Lactate ◽  
Physiological Response ◽  
Body Height ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Energy System ◽  
Mean Values ◽  
National Team ◽  
Significant Difference

Summary During a karate competition, a competitor in the kata discipline may choose one kata of 102 katas on the list. This kata must not be repeated. Katas differ in duration, complexity, number of fast and slow techniques, which also means different intensity, physiological response of the karateka body and energy coverage. Problems and Aim. In our study, we focused on the identification and assessment of the duration and difficulty of selected katas by monitoring the internal response of the human body (heart rate, lactate) of three top women´s Slovak national team karate competitors of kata individual categories during training and competition. Methods. The research sample consisted of 3 karate kata athletes (age 17.3 years, body height 161.7 cm, body weight 55.7 kg), who trained kata on average 7 years. To evaluate the indicators of the internal body load in selected katas we used mean, standard deviation, min-max. Results. The highest mean maximum heart rate values athletes had during performance kata Gojushi Ho (187 ± 8.2 bpm). The highest average heart rate values were observed during performance kata Chatanyara Kushanku (171 ± 9.9). Similarly, we found the highest mean values of blood lactate 4 minutes after performance kata Chatanyara Kushanku. (7.6 ± 2.5 mmol.l-1). The longest duration had the kata Suparinpei (204 ± 13 s). There was a significant difference in level of blood lactate reached in different katas (p ≤ 0.05) and the duration of katas. Conclusions. The duration of 5 most common katas used at the high level competition is different (p ≤ 0.05), thus the intensity expressed by the frequency of the techniques, and heart rate and blood lactate concentration. ATP-PCr energy system seems to be the major contributor while contribution of the aerobic energy system rises with the increase in duration of kata.

scholarly journals Comparison of perceptual and physiological variables of running on a track, motorized treadmill, and non-motorized curved treadmill at increasing velocity

2016 ◽  
Vol 22 ◽  
pp. 20 ◽  
Author(s):  
Veronika Myran Wee ◽  
Erna Von Heimburg ◽  
Roland Van den Tillaar
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Blood Lactate ◽  
Perceived Exertion ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Treadmill Running ◽  
Male Athletes ◽  
Physiological Variables ◽  
The Difference

The aim of this study was to compare perceptual and physiological variables between running on three different modalities — an indoor athletics track, a motorized treadmill, and a non-motorized curved treadmill — for 1000 m at three different velocities. Ten male athletes (age 24±3 years, body mass 69.8±6.91 kg, height 1.80±0.06 m, VO2peak 69.0±6.70 ml/kg/ min) conducted three 1000 m laps at increasing velocity on three different running modalities. The athletes had a 3-minute recovery between each lap, where the rate of perceived exertion (RPE) was registered and the blood lactate concentration and heart rate were measured. Oxygen uptake was measured using a portable metabolic analyser. The physiological (oxygen uptake, heart rate, and blood lactate concentration) and perceptual (RPE) variables were higher when running on a non-motorized curved treadmill compared with running on the track or a motorized treadmill. No differences were found between running on a motorized treadmill and the track except for the RPE, which was lower when running on the track compared with the motorized treadmill. Running on a non-motorized curved treadmill at three different velocities results in a higher oxygen uptake (37%) and heart rate (22%) and is subjectively much harder than running on a track or a motorized treadmill at the same velocities. The difference is around 4 km/h when comparing the physiological and perceptual responses. Thus, when performing training sessions on a non-motorized curved treadmill, subjects should subtract 4 km/h from their regular pace on a track or motorized treadmill to get the same response considering oxygen uptake, heart rate, RPE and blood lactate concentration.

scholarly journals The Effect of Aerobic Exercise on Intraocular Pressure in Horse

2010 ◽  
Vol 79 (3) ◽  
pp. 409-413 ◽  
Author(s):  
Elisabetta Giudice ◽  
Claudia Giannetto ◽  
Stefania Casella ◽  
Giuseppe Piccione
Keyword(s):  
Blood Pressure ◽  
Intraocular Pressure ◽  
Diastolic Blood Pressure ◽  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Anaerobic Exercise ◽  
Significant Difference ◽  
Haematological Changes ◽  
Intensity Of Exercise

The present study was planned to investigate the effect of the intensity of exercise on intraocular pressure (IOP), systolic and diastolic blood pressure, glycaemia and blood lactate concentration in regularly trained Italian saddle jumper horses. On the first day five female horses performed 1 h of walking on an electronically controlled horse-walker at 100 m/min; on the second day 1 h session consisted of 5 min of walk, 30 min of trot, 20 min of gallop and one exercise of a 300 m long trail with eight jumps 90 cm high to be run in 1 min. The studied indicators were collected at rest, immediately after the exercise and 30 min after the exercise. Analysis of variance (ANOVA) showed a significant effect of different workloads on blood lactate concentration, systolic and diastolic blood pressure. No significant difference was found in IOP reduction when comparing aerobic and moderate anaerobic exercise. Our results confirm that the lack of a significant change in IOP in the athletic horse after mild exercise is in accordance with the human athlete. The cardiovascular and haematological changes induced by aerobic and moderate anaerobic exercise had no significant effect on IOP, either.

The influence of execution speed on blood lactate concentration in strength training protocol in bench press exercise

2020 ◽  
Vol 19 (1) ◽  
pp. 32
Author(s):  
Gustavo Taques Marczynski ◽  
Luís Carlos Zattar Coelho ◽  
Leonardo Emmanuel De Medeiros Lima ◽  
Rodrigo Pereira Da Silva ◽  
Dilmar Pinto Guedes Jr ◽  
...  
Keyword(s):  
Strength Training ◽  
Blood Lactate ◽  
Bench Press ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
The Third ◽  
Fast Speed ◽  
Work Volume ◽  
Execution Speed ◽  
Training Protocol

The aim of this study was to analyze the influence of two velocities of execution relative to blood lactate concentration in strength training exercise until the momentary concentric failure. Fifteen men (29.1 ± 5.9 years), trained, participated in the experiment. The volunteers performed three bench press sessions, with an interval of 48 hours between them. At the first session, individuals determined loads through the 10-12 RMs test. In the following two sessions, three series with 90 seconds of interval were performed, in the second session slow execution speed (cadence 3030) and later in the third session fast speed (cadence 1010). For statistical analysis, the Student-T test was used for an independent sample study and considered the value of probability (p) ≤ 0.05 statistically significant. By comparing the number of repetitions and time under tension of the two runs, all series compared to the first presented significant reductions (p < 0.05). The total work volume was higher with the fast speed (p < 0.05). The study revealed that rapid velocities (cadence 1010) present a higher concentration of blood lactate when compared to slow runs (cadence 3030). The blood lactate concentration, in maximum repetitions, is affected by the speed of execution.Keywords: resistance training, cadence, blood lactate.

Effects of cocaine on incremental treadmill exercise in horses

1993 ◽  
Vol 75 (6) ◽  
pp. 2727-2733 ◽  
Author(s):  
K. H. McKeever ◽  
K. W. Hinchcliff ◽  
D. F. Gerken ◽  
R. A. Sams
Keyword(s):  
Right Ventricular ◽  
Blood Lactate ◽  
Venous Blood ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Ventricular Pressure ◽  
Mixed Venous Blood ◽  
Work Intensity ◽  
Venous Blood Lactate ◽  
Mixed Venous

Four mature horses were used to test the effects of two doses (50 and 200 mg) of intravenously administered cocaine on hemodynamics and selected indexes of performance [maximal heart rate (HRmax), treadmill velocity at HRmax, treadmill velocity needed to produce a blood lactate concentration of 4 mmol/l, maximal mixed venous blood lactate concentration, maximal treadmill work intensity, and test duration] measured during an incremental treadmill test. Both doses of cocaine increased HRmax approximately 7% (P < 0.05). Mean arterial pressure was 30 mmHg greater (P < 0.05) during the 4- to 7-m/s steps of the exercise test in the 200-mg trial. Neither dose of cocaine had an effect on the responses to exertion of right atrial pressure, right ventricular pressure, or maximal change in right ventricular pressure over time. Maximal mixed venous blood lactate concentration increased 41% (P < 0.05) with the 50-mg dose and 75% (P < 0.05) with the 200-mg dose during exercise. Administration of cocaine resulted in decreases (P < 0.05) in the treadmill velocity needed to produce a blood lactate concentration of 4 mmol/l from 6.9 +/- 0.5 and 6.8 +/- 0.9 m/s during the control trials to 4.4 +/- 0.1 m/s during the 200-mg cocaine trial. Cocaine did not alter maximal treadmill work intensity (P > 0.05); however, time to exhaustion increased by approximately 92 s (15%; P < 0.05) during the 200-mg trial.(ABSTRACT TRUNCATED AT 250 WORDS)

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