Gas exchange and lactate anaerobic thresholds: inter- and intraevaluator agreement

1985 ◽  
Vol 58 (6) ◽  
pp. 2082-2089 ◽  
Author(s):  
L. B. Gladden ◽  
J. W. Yates ◽  
R. W. Stremel ◽  
B. A. Stamford
Keyword(s):  
Gas Exchange ◽  
Linear Regression ◽  
Computer Program ◽  
Blood Lactate ◽  
Intraclass Correlation ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
The Mean ◽  
Graph Sets ◽  
Better Than

Twenty-four coded graph sets of gas exchange variables and blood lactate concentration (LA) plotted against time at 15-s intervals were analyzed by nine evaluators who determined the gas exchange (ATGE) and LA (ATLA) anaerobic thresholds. In addition, ATGE and ATLA were determined by a linear regression computer program. Agreement between ATGE and ATLA was poor; the median intraclass correlation coefficient (ri) was 0.53. Among evaluators, ATLA agreement (median ri = 0.81) was better than ATGE agreement (median ri = 0.70). In general, the ability of any evaluator to choose similar values from duplicate plots for either ATGE (median ri = 0.97) or ATLA (median ri = 0.995) was good. There was better agreement between the mean ATLA of the evaluators and the computer ATLA (ComLA) (ri = 0.88) than between the mean ATGE of the evaluators and the computer ATGE (ComVE), (ri = 0.58). Agreement between ComVE and ComLA was poor (ri = 0.29). These results suggest that ATGE does not accurately predict ATLA and that different evaluators choose different thresholds from the same data. Further assessment of the validity and precision of ATGE based on breath-by-breath and minute-by-minute data is needed.

Continuous increase in blood lactate concentration during different ramp exercise protocols

1989 ◽  
Vol 66 (3) ◽  
pp. 1104-1107 ◽  
Author(s):  
M. E. Campbell ◽  
R. L. Hughson ◽  
H. J. Green
Keyword(s):  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Continuous Model ◽  
Work Rate ◽  
Transformation Model ◽  
Mean Square ◽  
Log Transformation ◽  
Ramp Exercise ◽  
The Mean

The applicability of a continuous model description of the blood lactate concentration [( La-]) vs. O2 uptake (VO2) relationship was studied in nine healthy male volunteers during three different ramp exercise protocols. The work rate was increased at either 8, 15, or 50 W/min. The continuous model for [La-] = a + b exp(cVO2) was compared statistically with a previously proposed log-log transformation model for the [La-] and VO2 variables. It was found that the mean square error was significantly less for the continuous as opposed to the log-log model (P less than 0.01) by analysis of variance pooled across all three ramp slopes. The mean square errors from the individual ramp slopes were also significantly less for the continuous model by paired t test (P less than 0.05). It was observed that the major contributor to the increased error of the log-log model was at VO2's at or above the intersection point (lactate threshold) of the two linear log-transformed segments. The log-log transformation does not appear to relate to any physiological process. The lactate slope index, taken as the point where the slope of the relationship between [La-] and VO2 (i.e., d[La-]/dVO2) equaled 1, occurred at a mean VO2 of 2.25 and 2.37 l/min for the 15- and 8-W/min ramp slopes, respectively, but at 2.76 l/min for the 50-W/min ramp (P less than 0.05). It is concluded that [La-] increases as a continuous function with respect to VO2 across a wide range of ramp work rate slopes.

DOES THE GAS EXCHANGE ANAEROBIC THRESHOLD OCCUR AT AN ABSOLUTE BLOOD LACTATE CONCENTRATION OF 2 OR 4 mM?

1982 ◽  
Vol 14 (2) ◽  
pp. 114 ◽  
Author(s):  
J. A. Davis ◽  
V. J. Caiozzo ◽  
J. F. Ellis ◽  
J. L. Azus ◽  
R. Vandagriff ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Blood Lactate ◽  
Anaerobic Threshold ◽  
Lactate Concentration ◽  
Blood Lactate Concentration

Blood lactates after prolonged severe exercise

1963 ◽  
Vol 18 (3) ◽  
pp. 619-622 ◽  
Author(s):  
Per-Olof Åstrand ◽  
Inger Hallbäck ◽  
Rune Hedman ◽  
Bengt Saltin
Keyword(s):  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Mean Value ◽  
Common Finding ◽  
Work Time ◽  
Severe Exercise ◽  
The Mean ◽  
Cross Country ◽  
Maximal Effort

Blood was drawn from cross-country skiers at 1–3 min after the finish in competitions on distances from 10 to 85 km and the blood lactate determined. Despite a maximal effort of the skiers, accentuated at the end of the race, there was a successive decrease in the blood lactate concentration with work time. After a 10-km race, work time 35–36 min, the average was 139 mg/100 ml of blood (12.5 mEq/liter); after a 30-km race, with a time of 1 hr 50 min-1 hr 56 min, the mean value was 68 mg/100 ml (6.1 mEq/liter); and after a 50-km race, work time 3 hr 6 min-3 hr 18 min, 39 mg/100 ml (3.5 mEq/liter). A lactate concentration exceeding 100 mg/100 ml is a common finding after maximal muscular exercise involving large muscles. The explanation for the low values after prolonged maximal work, indicating a different kind of fatigue, is presently obscure. Data are presented on the oxygen uptake attained during skiing at actual racing speed (average Vo2 = 4.45 liters/min). Submitted on July 16, 1962

scholarly journals Blood lactate level in Elite boy swimmers after lactate tolerance exercise test

2017 ◽  
Vol 4 (05) ◽  
pp. 1318
Author(s):  
Asghar Nikseresht ◽  
Iman Yabande ◽  
Karamatollah Rahmanian ◽  
Abdolreza Sotoodeh Jahromi
Keyword(s):  
Blood Lactate ◽  
Exercise Test ◽  
High Intensity ◽  
Lactate Level ◽  
Baseline Level ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Blood Lactate Level ◽  
Enzymatic Method ◽  
The Mean

Introduction: To avoid injuries during high-intensity sports training, it is important to recognize conditions of bodily consumption and production of adequate energy; exercise increases the concentration of the blood lactate. This paper is an attempt to compare pre and post lactate tolerance exercise test - blood lactate concentrations - of elite boy swimmers. Methods: Blood lactates are measured by an enzymatic method on 12 subjects 30 minutes before and adjust and 24 hours after the test. Results: The mean lactate concentration of 30.35±12.16 mg/dl is observed in swimmers 30 minutes before the test. Swimmers adjust after the test show mean blood lactate concentration of 108.52±18.17 mg/dl that is significantly higher than 30 minutes before the test (p<0.001). Then blood lactate level decreases below baseline level at 24 hours after the test. Conclusion: Blood lactate increases with the test and decreases below baseline within 24 hours after the test. 

scholarly journals Changes in heart rate and blood lactate concentration during karate kata competition

2020 ◽  
Vol 24 (3) ◽  
pp. 137-142 ◽  
Author(s):  
R. Penov ◽  
P. Petrov ◽  
S. Kolimechkov
Keyword(s):  
Heart Rate ◽  
Blood Lactate ◽  
Muscle Tension ◽  
Lactate Concentration ◽  
Three Dimensional ◽  
Blood Lactate Concentration ◽  
Moderate Increase ◽  
National Team ◽  
The Third ◽  
The Mean

Background and Study Aim : Karate is going to take part in the Olympic games, for the first time in Tokyo 2020. The aim of this study was to analyse the changes in heart rate (HR) and blood lactate concentration of karate practitioners performing different katas in competitive conditions. Material and Methods : This study consisted of five elite male athletes (26.80±5.97 years), members of the Bulgarian national team in Shotokan karate, competing in the kata discipline. The study was conducted in competitive conditions during national competitions, in which three katas were performed by each of the competitors. Capillary blood lactate concentration (La) was determined at rest and after each kata. Heart rate (HR) was registered and physical activity was monitored by using three-dimensional accelerometers. Results: The mean La increased progressively after each following kata: 1.4±0.32 mmol/L at rest, 4.7±1.91 mmol/L after the first, 6.8±2.59 mmol/L after the second, and 7.1±2.35 mmol/L after the third kata. This increase was significant after the second (р<0.05) and third (р<0.01) kata, in comparison with the registered La at rest. The mean HR values reached 179±11.55 bpm during the first, 180±11.63 bpm during the second, and 181.5±15.44 bpm during the third kata. Conclusions: The La appeared to be a more informative parameter than heart rate, and the moderate increase of the La values (4-6 mmol/L) indicated optimal muscle tension and amplitude of moves when performing katas in competitive conditions. Further research is needed to determine the optimal La levels for the performance of different katas.

Higher exercise performance and lower VO2max in Tibetan than Han residents at 4,700 m altitude

1994 ◽  
Vol 77 (2) ◽  
pp. 684-691 ◽  
Author(s):  
R. L. Ge ◽  
Q. H. Chen ◽  
L. H. Wang ◽  
D. Gen ◽  
P. Yang ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Exercise Performance ◽  
Maximal Exercise ◽  
Minute Ventilation ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Blood Gases ◽  
Lower Blood ◽  
The Mean ◽  
Peripheral Adaptation

To examine the hypothesis that the pathway of adaptation to high altitude in natives differs considerably from that in newcomers, we measured maximal O2 uptake (VO2max), minute ventilation, anaerobic threshold (AT), blood lactate, and blood gases during maximal exercise in 17 lifelong Tibetan residents and 14 acclimatized Han Chinese newcomers living at the altitude of 4,700 m. The two groups were similar in age, height, and weight, and the subjects were nonathletes. Although VO2max was significantly lower in the Tibetans than in the Hans (30.4 +/- 1.5 vs. 36.0 +/- 1.9 ml.min-1.kg-1 STPD; P < 0.05), at maximal exercise effort the exercise workload was greater (167.7 +/- 4.2 vs. 150.0 +/- 5.9 W; P < 0.05). The mean AT values (in % VO2max) in the Tibetan and Han subjects were 84.1 and 61.6%, respectively (P < 0.01). Minute ventilation at maximal exercise was significantly lower in the Tibetans than in the Hans (68.4 +/- 3.4 vs. 79.7 +/- 4.1 l/min BTPS; P < 0.05), whereas heart rate at maximal effort was equivalent in the two groups. The Tibetans showed lower blood lactate value than did the Hans both before and at the end of exercise. We conclude that the Tibetan natives have higher exercise performance and AT but lower VO2max and blood lactate concentration than do acclimatized Han newcomers. These results may reflect the effects of genetic or peripheral adaptation factors in the Tibetan natives.

Does the Gas Exchange Anaerobic Threshold Occur at a Fixed Blood Lactate Concentration of 2 or 4 mM?

1983 ◽  
Vol 04 (02) ◽  
pp. 89-93 ◽  
Author(s):  
J. Davis ◽  
V. Caiozzo ◽  
N. Lamarra ◽  
J. Ellis ◽  
R. Vandagriff ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Blood Lactate ◽  
Anaerobic Threshold ◽  
Lactate Concentration ◽  
Blood Lactate Concentration

scholarly journals PSXI-19 Investigating the Relationship Between Temperament and Performance Traits in Feedlot Cattle

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 383-384
Author(s):  
Jesse Bouffiou ◽  
Jane A Boles ◽  
Jennifer M Thomson
Keyword(s):  
Standard Deviation ◽  
Blood Lactate ◽  
Feed Intake ◽  
Average Daily Gain ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Feedlot Cattle ◽  
Exit Velocity ◽  
The Mean ◽  
And Performance

Abstract Temperament in cattle, is defined as behavioral changes in response to humans or changes in the environment, and has been associated with reduced feed efficiency, reduced growth rate, and poor feedlot health. The objective of the study was to determine if temperament affected the performance, growth and health of feedlot cattle. One-hundred and thirty-one Angus x Simmental steers from a single ranch were sampled at a commercial feedlot in Chappell, NE. Blood samples for metabolite analysis, exit velocity, and blood lactate concentration for temperament classification were collected in addition to feedlot performance data and carcass quality measurements. The GLM and LSM procedures of SAS (SAS 9.4, 2014) were used to evaluate differences between temperament classifications. Pearson correlations were calculated between temperament and performance variables. Steers were divided into three exit velocity classifications, with fast animals (n = 27) having exit velocity greater than one standard deviation from the mean and slow animals (n = 26) having exit velocities lower than one standard deviation from the mean. Feed intake and behavior was monitored for 42 days with GrowSafe feed bunks and average daily gain, dry matter intake and residual feed intake calculated. There were significant differences between the temperament classifications of fast, medium and slow for both exit velocity and blood lactate (P &lt; 0.0001), indicating there was a difference in responses from the classifications. Exit velocity had no effect on any of the growth parameters measured. There was a significant positive correlation between exit velocity and blood lactate (P &lt; 0.0001). RFI was significantly correlated with exit velocity (P = 0. 051) and blood lactate (P &lt; 0.05). This suggests that animals with higher RFI or less efficient animals had more flighty temperaments as determined by blood lactate and exit velocity.

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.

Sign in / Sign up

Export Citation Format

Share Document