Search Results

You are looking at 1 - 10 of 682 items for :

  • "blood lactate" x
  • Refine by Access: All Content x
Clear All
Restricted access

Billy Sperlich, Silvia Achtzehn, Mirijam Buhr, Christoph Zinner, Stefan Zelle, and Hans-Christer Holmberg

Purpose:

This study aimed to quantify the intensity profile of elite downhill mountain bike races during competitions.

Methods:

Seventeen male downhill racers (22 ± 5 y; 185.1 ± 5.3 cm; 68.0 ± 3.9 kg; VO2peak: 59.4 ± 4.1 mL·min·kg−1) participated in the International German Downhill Championships in 2010. The racers’ peak oxygen uptake and heart rate (HR) at 2 and 4 mmol·L−1 blood lactate (HR2 and HR4), were assessed during an incremental laboratory step test (100 W, increase 40 W every 5 min). During the races, the HR was recorded and pre- and postrace blood lactate concentrations as well as salivary cortisol levels were obtained.

Results:

During the race, the absolute time spent in the “easy” intensity zone was 23.3 ± 6.8 s, 24.2 ± 12.8 s (HR2–HR4) in the “moderate” zone, and 151.6 ± 18.3 s (>HR4) in the “hard” zone. Eighty percent of the entire race was accomplished at intensities >90% HRpeak. Blood lactate concentrations postrace were higher than those obtained after the qualification heat (8.0 ± 2.5 mmol·L−1 vs 6.7 ± 1.8 mmol·L−1, P < .01). Salivary levels of cortisol before the competition and the qualification heat were twice as high as at resting state (P < .01).

Conclusions:

This study shows that mountain bike downhill races are conducted at high heart rates and levels of blood lactate as well as increased concentration of salivary cortisol as marker for psycho-physiological stress.

Restricted access

Mikael Fogelholm, Inkeri Ruokonen, Juha T. Laakso, Timo Vuorimaa, and Jaakko-Juhani Himberg

By means of a 5-week vitamin B-complex .supplementation, associations between indices of vitamin B1, B2, and B6, status (activation coefficients [AC] for erythrocyte transketolase, glutathione reductase, and aspartate aminotransferase) and exercise-induced blood lactate concentration were studied. Subjects, 42 physically active college students (18–32 yrs), were randomized into vitamin (n=22) and placebo (n=20) groups. Before the supplementation there were no differences in ACs or basal enzyme activities between the groups. The ACs were relatively high, suggesting marginal vitamin status. In the vitamin group, all three ACs were lower (p<0.0001) after supplementation: transketolase decreased from l. 16 (1.14–1.18) (mean and 95% confidence interval) to 1.08 (1.06–1.10); glutathione reductase decreased from 1.33 (1.28–1.39) to 1 .I4 (1.1 1–1.17); and aspartate aminotransferase decreased from 2.04 (1.94–2.14) to 1.73 (1.67–1.80). No changes were found after placebo. Despite improved indices of vitamin status, supplementation did not affect exercise-induced blood lactate concentration. Hence no association was found between ACs and blood lactate. It seems that marginally high ACs do not necessarily predict altered lactate metabolism.

Restricted access

Junhyeong Lim, Hyeongjun Park, Seunghee Lee, and Jihong Park

-intensity movement (eg, walking or jogging). 9 An increased blood flow is thought to be the mechanism, which facilitates the removal of blood lactate concentration due to the elimination of blood H + 10 and activation of oxidation. 11 Previous studies on CWI have also reported effectiveness in reducing fatigue

Open access

Petra Lundström, Katarina Lauruschkus, Åsa Andersson, and Åsa B. Tornberg

tissue hypoxia is absent. Mild hyperlactatemia has been defined as persistent increase in blood lactate concentration (≥2.1–5 mmol/L) ( 8 ), whereas, lactic acidosis is defined as metabolic acidosis (≥5 mmol) ( 8 ). CP is a permanent heterogeneous disorder caused by a lesion in the immature brain ( 30

Restricted access

Subir Gupta, Arkadiusz Stanula, and Asis Goswami

physiological parameters that influence long-distance running performance are maximal oxygen consumption (VO 2 max), running economy, and fractional utilization of aerobic capacity. 2 A number of studies have been conducted to find out the most appropriate time for the measurement of peak blood lactate

Restricted access

Naoya Takei, Katsuyuki Kakinoki, Olivier Girard, and Hideo Hatta

, only one study examined the effects of acute moderate and severe hypoxia (inspired fraction of oxygen or FiO 2 of 0.164 and 0.136, respectively) versus normoxia on RW performance (4 × 30-s Wingate efforts with 4-min recovery). 10 In this previous study, blood lactate concentration (BLa) was only

Restricted access

Jason P. Brandenburg and Luisa V. Giles

period, an incremental exercise test was then conducted to determine VO 2 max. The final three visits served as experimental sessions. In each experimental session, participants completed an 8-km TT. Blood lactate, CMVJ, and DJ were assessed before the TT and during a 30-min recovery period. Saliva

Restricted access

Jason D. Vescovi, Olesya Falenchuk, and Greg D. Wells

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.

Restricted access

Peter Pfitzinger and Patty Freedson

Part 1 reviews the literature concerning peak blood lactate responses to exercise in children. After a brief overview of lactate metabolism, an analysis is presented comparing children to adults regarding peak blood lactate concentration. Possible factors accounting for lower blood lactate concentrations during maximal exercise in children are considered.

Restricted access

Ralph Beneke, Renate M. Leithäuser, and Oliver Ochentel

A link between lactate and muscular exercise was seen already more than 200 years ago. The blood lactate concentration (BLC) is sensitive to changes in exercise intensity and duration. Multiple BLC threshold concepts define different points on the BLC power curve during various tests with increasing power (INCP). The INCP test results are affected by the increase in power over time. The maximal lactate steady state (MLSS) is measured during a series of prolonged constant power (CP) tests. It detects the highest aerobic power without metabolic energy from continuing net lactate production, which is usually sustainable for 30 to 60 min. BLC threshold and MLSS power are highly correlated with the maximum aerobic power and athletic endurance performance. The idea that training at threshold intensity is particularly effective has no evidence. Three BLC-orientated intensity domains have been established: (1) training up to an intensity at which the BLC clearly exceeds resting BLC, light- and moderate-intensity training focusing on active regeneration or high-volume endurance training (Intensity < Threshold); (2) heavy endurance training at work rates up to MLSS intensity (Threshold ≤ Intensity ≤ MLSS); and (3) severe exercise intensity training between MLSS and maximum oxygen uptake intensity mostly organized as interval and tempo work (Intensity > MLSS). High-performance endurance athletes combining very high training volume with high aerobic power dedicate 70 to 90% of their training to intensity domain 1 (Intensity < Threshold) in order to keep glycogen homeostasis within sustainable limits.