scholarly journals The Effects of L-Citrulline on Blood-Lactate Removal Kinetics Following Maximal-Effort Exercise

2021 ◽  
pp. 1-13
Author(s):  
Benjamin Divito ◽  
Mackenzie McLaughlin ◽  
Ira Jacobs
Keyword(s):  
Blood Lactate ◽  
Lactate Removal ◽  
Maximal Effort

Muscle glycogen repletion during active postexercise recovery

1987 ◽  
Vol 253 (3) ◽  
pp. E305-E311 ◽  
Author(s):  
E. M. Peters Futre ◽  
T. D. Noakes ◽  
R. I. Raine ◽  
S. E. Terblanche
Keyword(s):  
Blood Lactate ◽  
Muscle Glycogen ◽  
High Intensity ◽  
Active Recovery ◽  
Muscle Lactate ◽  
Glycogen Resynthesis ◽  
Passive Recovery ◽  
Lactate Removal ◽  
Glycogen Repletion ◽  
Lactate Levels

High-intensity intermittent bicycle exercise was used to deplete muscle glycogen levels by 70% and elevate blood lactate levels to greater than 13.0 mmol/l. Thereafter subjects either cycled with one leg for 45 min followed by 45 min of passive recovery (partially active recovery) or rested for 90 min (passive recovery). During the first 45 min of partially active recovery 1) blood lactate (P less than 0.05) and pH levels (P less than 0.05) returned more rapidly to preexercise values than during passive recovery, 2) the rate of net glycogen resynthesis (0.28 mumol . g-1 . min-1) was the same in both legs, and 3) muscle lactate levels were significantly lower (P less than 0.05) in the passive than in the active leg. Thereafter the rate of net muscle glycogen resynthesis was unchanged (0.26 mumol . g-1 . min-1) and lactate removal could theoretically account for only 18% of the glycogen resynthesized. Overall, the rate of muscle glycogen resynthesis and muscle lactate removal was not different from that measured during passive recovery. After high-intensity exercise 1) glycogen repletion is not impeded by light exercise, and 2) blood glucose is an important substrate for glycogen resynthesis.

Lactate removal ability and graded exercise in humans

1990 ◽  
Vol 68 (3) ◽  
pp. 905-911 ◽  
Author(s):  
S. Oyono-Enguelle ◽  
J. Marbach ◽  
A. Heitz ◽  
C. Ott ◽  
M. Gartner ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Inverse Correlation ◽  
Continuous Model ◽  
Work Rate ◽  
Linear Relationships ◽  
Graded Exercise ◽  
Lactate Removal ◽  
The Individual

Venous lactate concentrations of nine athletes were recorded every 5 s before, during, and after graded exercise beginning at a work rate of 0 W with an increase of 50 W every 4th min. The continuous model proposed by Hughson et al. (J. Appl. Physiol. 62: 1975-1981, 1987) was well fitted with the individual blood lactate concentration vs. work rate curves obtained during exercise. Time courses of lactate concentrations during recovery were accurately described by a sum of two exponential functions. Significant direct linear relationships were found between the velocity constant (gamma 2 nu) of the slowly decreasing exponential term of the recovery curves and the times into the exercise when a lactate concentration of 2.5 mmol/l was reached. There was a significant inverse correlation between gamma 2 nu and the rate of lactate increase during the last step of the exercise. In terms of the functional meaning given to gamma 2 nu, these relationships indicate that the shift to higher work rates of the increase of the blood lactate concentration during graded exercise in fit or trained athletes, when compared with less fit or untrained ones, is associated with a higher ability to remove lactate during the recovery. The results suggest that the lactate removal ability plays an important role in the evolution pattern of blood lactate concentrations during graded exercise.

Lactate kinetics in resting and exercising forearms during moderate-intensity supine leg exercise

1993 ◽  
Vol 74 (1) ◽  
pp. 435-443 ◽  
Author(s):  
P. G. Catcheside ◽  
G. C. Scroop
Keyword(s):  
Skeletal Muscle ◽  
Blood Lactate ◽  
Lactate Production ◽  
Voluntary Contraction ◽  
Moderate Intensity ◽  
Arterial Blood ◽  
Exercise Period ◽  
Leg Exercise ◽  
Lactate Removal ◽  
Lactate Levels

Arterial blood lactate was elevated by supine leg exercise (20 min at approximately 65% maximal oxygen uptake) in five untrained male subjects, and the contribution to blood lactate removal from passive uptake vs. metabolic disposal was compared in resting and lightly exercising (15% maximal voluntary contraction static handgrip) forearm skeletal muscle. An integrated form of the Fick equation was used to predict venous lactate levels resulting solely from passive equilibration of lactate between incoming arterial blood and the forearm muscles. In the resting forearm, predicted and measured venous lactate levels were closely correlated during the exercise period (r = 0.995, P < 0.001), indicating that lactate removal could be accounted for in terms of passive uptake alone. In the lightly exercising forearm, measured venous lactate levels were higher than both the arterial and predicted venous levels, indicating net lactate production. It was concluded that most of the blood lactate generated by moderate-intensity supine leg exercise is taken up passively and not metabolized by resting skeletal muscle and that the rate of lactate disposal is unlikely to be enhanced in lightly exercising muscle.

Relationship between turnover rate and blood concentration of lactate in exercising dogs

1975 ◽  
Vol 39 (2) ◽  
pp. 231-234 ◽  
Author(s):  
F. L. Eldridge
Keyword(s):  
Steady State ◽  
Blood Lactate ◽  
Turnover Rate ◽  
The Other ◽  
Constant Infusion ◽  
Blood Concentrations ◽  
Lactate Turnover ◽  
Anesthetized Dogs ◽  
Lactate Removal ◽  
The Relationship

Steady-state blood lactate concentrationss and lactate turnover, or entry, rates were determined by use of constant infusion of L(+)-[14C]lactate in seven anesthetized dogs before and during electrically induced exercise. Lactate entry rates increased during exercise in all dogs with or without the infusion of additional exogenous cold lactate. Blood lactate concentrations, on the other hand, rose to levels considerably below those predicted for these entry rates in a previous study of the relationship in normal nonexercising dogs. It is concluded that improved efficiency of lactate removal during exercise allows low blood concentrations despite large increases in entry rates.

Blood Lactate Concentration and Clearance in Elite Swimmers During Competition

2011 ◽  
Vol 6 (1) ◽  
pp. 106-117 ◽  
Author(s):  
Jason D. Vescovi ◽  
Olesya Falenchuk ◽  
Greg D. Wells
Keyword(s):  
Blood Lactate ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Active Recovery ◽  
Competitive Swimming ◽  
Elite Swimmers ◽  
Lactate Removal ◽  
The Relationship ◽  
Competitive Swimmers ◽  
Effect Of Age

Purpose:Blood lactate concentration, [BLa], after swimming events might be influenced by demographic features and characteristics of the swim race, whereas active recovery enhances blood lactate removal. Our aims were to (1) examine how sex, age, race distance, and swim stroke influenced [BLa] after competitive swimming events and (2) develop a practical model based on recovery swim distance to optimize blood lactate removal.Methods:We retrospectively analyzed postrace [BLa] from 100 swimmers who competed in the finals at the Canadian Swim Championships. [BLa] was also assessed repeatedly during the active recovery. Generalized estimating equations were used to evaluate the relationship between postrace [BLa] with independent variables.Results:Postrace [BLa] was highest following 100–200 m events and lowest after 50 and 1500 m races. A sex effect for postrace [BLa] was observed only for freestyle events. There was a negligible effect of age on postrace [BLa]. A model was developed to estimate an expected change in [BLa] during active recovery (male = 0; female = 1): [BLa] change after active recovery = –3.374 + (1.162 × sex) + (0.789 × postrace [BLa]) + (0.003 × active recovery distance).Conclusions:These findings indicate that swimmers competing at an elite standard display similar postrace [BLa] and that there is little effect of age on postrace [BLa] in competitive swimmers aged 14 to 29 y.

BLOOD LACTATE REMOVAL USING COMBINED MASSAGE AND ACTIVE RECOVERY

2003 ◽  
Vol 35 (Supplement 1) ◽  
pp. S317 ◽  
Author(s):  
D P. Micklewright ◽  
R Beneke ◽  
V Gladwell ◽  
M H. Sellens
Keyword(s):  
Blood Lactate ◽  
Active Recovery ◽  
Lactate Removal

scholarly journals Relationships between maximal muscle oxidative capacity and blood lactate removal after supramaximal exercise and fatigue indexes in humans

2004 ◽  
Vol 97 (6) ◽  
pp. 2132-2138 ◽  
Author(s):  
C. Thomas ◽  
P. Sirvent ◽  
S. Perrey ◽  
E. Raynaud ◽  
J. Mercier
Keyword(s):  
Blood Lactate ◽  
Citrate Synthase ◽  
Vastus Lateralis ◽  
Oxidative Capacity ◽  
Slow Phase ◽  
Vastus Lateralis Muscle ◽  
Supramaximal Exercise ◽  
Muscle Oxidative Capacity ◽  
S Cycling ◽  
Lactate Removal

The present study investigated whether blood lactate removal after supramaximal exercise and fatigue indexes measured during continuous and intermittent supramaximal exercises are related to the maximal muscle oxidative capacity in humans with different training status. Lactate recovery curves were obtained after a 1-min all-out exercise. A biexponential time function was then used to determine the velocity constant of the slow phase (γ2), which denoted the blood lactate removal ability. Fatigue indexes were calculated during all-out (FIAO) and repeated 10-s cycling sprints (FISprint). Biopsies were taken from the vastus lateralis muscle, and maximal ADP-stimulated mitochondrial respiration ( Vmax) was evaluated in an oxygraph cell on saponin-permeabilized muscle fibers with pyruvate + malate and glutamate + malate as substrates. Significant relationships were found between γ2 and pyruvate + malate Vmax ( r = 0.60, P < 0.05), γ2 and glutamate + malate Vmax ( r = 0.66, P < 0.01), and γ2 and citrate synthase activity ( r = 0.76, P < 0.01). In addition, γ2, glutamate + malate Vmax, and pyruvate + malate Vmax were related to FIAO (γ2 − FIAO: r = 0.85; P < 0.01; glutamate + malate Vmax − FIAO: r = 0.70, P < 0.01; and pyruvate + malate Vmax − FIAO: r = 0.63, P < 0.01) and FISprint (γ2 − FISprint: r = 0.74, P < 0.01; glutamate + malate Vmax − FISprint: r = 0.64, P < 0.01; and pyruvate + malate Vmax − FISprint: r = 0.46, P < 0.01). In conclusion, these results suggested that the maximal muscle oxidative capacity was related to blood lactate removal ability after a 1-min all-out test. Moreover, maximal muscle oxidative capacity and blood lactate removal ability were associated with the delay in the fatigue observed during continuous and intermittent supramaximal exercises in well-trained subjects.

Metabolic recovery from exhaustive activity by a large lizard

1980 ◽  
Vol 48 (4) ◽  
pp. 689-694 ◽  
Author(s):  
T. T. Gleeson
Keyword(s):  
Temperature Dependence ◽  
Blood Lactate ◽  
Lactate Concentration ◽  
Lactate Production ◽  
Blood Lactate Concentration ◽  
Excess Oxygen ◽  
Temporal Separation ◽  
Metabolic Recovery ◽  
Strenuous Activity ◽  
Lactate Removal

Gas exchange (VO2 and VCO2) and blood lactate concentration were measured in the lizard Amblyrhynchus cristatus at 25 and 35 degrees C during resting, running, and recovery after exhaustion (less than or equal to 180 min) to analyze the temperature dependency of metabolic recovery in this lizard. Amblyrhynchus exhausted twice as fast (4.2 vs. 8.8 min) at 25 degrees C than when running at the same speed at 35 degrees C. At both temperatures, VO2 and VCO2 increased rapidly during activity and declined toward resting levels during recovery in a manner similar to other vertebrates. Respiratory quotients (R, where R = VCO2/VO2) exceeded 2.0 after exhaustion at both temperatures. Extensive lactate production occurred during activity; blood lactate concentrations ranged from 1.0 to 1.7 mg lactate/ml blood after activity. Net lactate removal exhibited a temperature dependence. Blood lactate concentrations remained elevated hours after VO2 returned to normal. Endurance was reduced in lizards that had recovered aerobically but still possessed high lactate concentrations. The temporal separation of the excess oxygen consumption and lactate removal suggests that the concept of the lactacid oxygen debt is not applicable to this animal. The temperature dependence of total metabolic recovery suggests a benefit for Amblyrhynchus that select warm basking temperatures following strenuous activity.

Effect of Active and Passive Recovery on Blood Lactate and Performance During Simulated Competition in High Level Gymnasts

2003 ◽  
Vol 28 (2) ◽  
pp. 240-256 ◽  
Author(s):  
Monèm Jemni ◽  
William A. Sands ◽  
Françoise Friemel ◽  
Paul Delamarche
Keyword(s):  
Blood Lactate ◽  
Sitting Position ◽  
Active Recovery ◽  
Blood Samples ◽  
Passive Recovery ◽  
Recovery Strategies ◽  
Lactate Removal ◽  
And Performance ◽  
Recovery Protocols ◽  
High Level

The purpose of this study was to investigate the effect of two recovery strategies between men's gymnastics events on blood lactate removal (BL) and performance as rated by expert "blind" judges. Twelve male gymnasts (21.8 ± 2.4 years) participated. The sessions were composed of routine performances in the six Olympic events, which were separated by 10 min of recovery. All gymnasts performed two recovery protocols between events on separate days: Rest protocol, 10 min rest in a sitting position; combined protocol, 5 min rest and 5 min self-selected active recovery. Three blood samples were taken at 2, 5, and 10 min following each event. Gymnasts produced moderate values of BL following each of the six events (2.2 to 11.6 mmolúL−1). There was moderate variability in BL values between events that could not be accounted for by the athlete's event performance. Gymnasts showed higher BL concentration (p > .05) and significantly (p < .05) higher scoring performances (as rated by a panel of certified judges) when they used a combined recovery between gymnastics events rather than a passive recovery (ΔBL = 40.51% vs. 28.76% of maximal BL, p < .05, and total score = 47.28 ± 6.82 vs. 38.39 ± 7.55, p < .05, respectively). Key words: oxidation, removal, heart rate

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