Blood Lactate Dynamics and Heart Rate Variability during Ultra-Distance Relay Running

Introduction. The purpose of this study was to evaluate the application of the Dmax method on heart rate variability (HRV) to estimate the lactate thresholds (LT), during a maximal incremental running test (MIRT). Methods. Nineteen male runners performed two MIRTs, with the initial speed at 8 km·h−1 and increments of 1 km·h−1 every 3 minutes, until exhaustion. Measures of HRV and blood lactate concentrations were obtained, and lactate (LT1 and LT2) and HRV (HRVTDMAX1 and HRVTDMAX2) thresholds were identified. ANOVA with Scheffe’s post hoc test, effect sizes (d), the bias ± 95% limits of agreement (LoA), standard error of the estimate (SEE), Pearson’s (r), and intraclass correlation coefficient (ICC) were calculated to assess validity. Results. No significant differences were observed between HRVTDMAX1 and LT1 when expressed for speed (12.1 ± 1.4 km·h−1 and 11.2 ± 2.1 km·h−1; p=0.55; d = 0.45; r = 0.46; bias ± LoA = 0.8 ± 3.7 km·h−1; SEE = 1.2 km·h−1 (95% CI, 0.9–1.9)). Significant differences were observed between HRVTDMAX2 and LT2 when expressed for speed (12.0 ± 1.2 km·h−1 and 14.1 ± 2.5 km·h−1; p=0.00; d = 1.21; r = 0.48; bias ± LoA = −1.0 ± 1.8 km·h−1; SEE = 1.1 km·h−1 (95% CI, 0.8–1.6)), respectively. Reproducibility values were found for the LT1 (ICC = 0.90; bias ± LoA = −0.7 ± 2.0 km·h−1), LT2 (ICC = 0.97; bias ± LoA = −0.1 ± 1.1 km·h−1), HRVTDMAX1 (ICC = 0.48; bias ± LoA = −0.2 ± 3.4 km·h−1), and HRVTDMAX2 (ICC = 0.30; bias ± LoA = 0.3 ± 3.5 km·h−1). Conclusions. The Dmax method applied over a HRV dataset allowed the identification of LT1 that is close to aerobic threshold, during a MIRT.

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Temporal sequence of recovery-related events following maximal exercise assessed by heart rate variability and blood lactate concentration

Clinical Physiology and Functional Imaging ◽

10.1111/cpf.12339 ◽

2016 ◽

Vol 37 (5) ◽

pp. 536-543 ◽

Cited By ~ 9

Author(s):

Rosangela Akemi Hoshi ◽

Luiz Carlos Marques Vanderlei ◽

Moacir Fernandes de Godoy ◽

Fábio do Nascimento Bastos ◽

Jayme Netto ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Blood Lactate ◽

Maximal Exercise ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Temporal Sequence

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Heart-Rate Variability and Blood-Lactate Threshold Interaction During Progressive Resistance Exercise in Healthy Older Men

The Journal of Strength and Conditioning Research ◽

10.1519/jsc.0b013e3181d2c0fe ◽

2010 ◽

Vol 24 (5) ◽

pp. 1313-1320 ◽

Cited By ~ 29

Author(s):

Rodrigo P Simões ◽

Renata G Mendes ◽

Viviane Castello ◽

Heloísa G Machado ◽

Larissa B Almeida ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Resistance Exercise ◽

Blood Lactate ◽

Lactate Threshold ◽

Older Men ◽

Progressive Resistance Exercise ◽

Progressive Resistance

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Psychophysiological response and energy balance during a 14-h ultraendurance mountain running event

Applied Physiology Nutrition and Metabolism ◽

10.1139/apnm-2014-0263 ◽

2015 ◽

Vol 40 (3) ◽

pp. 269-273 ◽

Cited By ~ 29

Author(s):

Vicente Javier Clemente-Suárez

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Energy Balance ◽

Blood Lactate ◽

Perceived Exertion ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Negative Energy ◽

Rating Of Perceived Exertion ◽

Psychophysiological Response

Many studies have researched the psychophysiological response and energy balance of athletes in numerous ultraendurance probes, but none has investigated an ultraendurance mountain running event. The current study aims to analyze changes in blood lactate concentration, rating of perceived exertion, heart rate, heart rate variability, and energy balance after the performance of an ultraendurance mountain running event. The parameters in the 6 participants who finished the event were analyzed (age, 30.8 ± 3.1 years; height, 176.2 ± 8.6 cm; body mass, 69.2 ± 3.7 kg). The race covered 54 km, with 6441 m of altitude change, 3556 m downhill and 2885 m uphill. The athletes completed together the race in 14 h and 6 min. After the ultraendurance event, the athletes presented a negative energy balance of 4732 kcal, a blood lactate concentration of 2.8 ± 0.3 mmol/L, a heart rate mean/heart rate maximum ratio of 0.64, a heart rate mean of 111.4 ± 5.9 beats/min, a decrease in vagal modulation, and an increase in sympathetic modulation, and recorded 19.5 ± 1.5 points on the 6–20 rating of perceived exertion scale. The event was a stressful stimulus for the athletes despite the low intensity measured by blood lactate concentration and heart rate. The results obtained may be used by coaches as a reference parameter of heart rate, heart rate variability, rating of perceived exertion, and lactate concentration to develop specific training programs. In addition, the energy balance data obtained in this research may improve nutritional intake strategies.

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Effects of Wearing a Jaw-repositioning Intra-oral Device in Synchronized Swimming Athletes

International Journal of Sports Medicine ◽

10.1055/a-1179-5806 ◽

2020 ◽

Vol 41 (12) ◽

pp. 839-845

Author(s):

Monica Solana-Tramunt ◽

Bernat Buscà ◽

Jose Morales ◽

Adrià Miró ◽

Joan Aguilera-Castells ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Blood Lactate ◽

Salivary Cortisol ◽

Perceived Exertion ◽

Female Athletes ◽

Training Session ◽

High Standard ◽

Rating Of Perceived Exertion ◽

Synchronized Swimming

AbstractThe effects of wearing an intra-oral device on several ventilatory and fatigue markers have been reported for a variety of sports. The quality of the figures performed in synchronized swimming is directly affected by fatigue, and can be monitored during training sessions (TS). The aim of the study was to investigate the acute effects of wearing customized intra-oral devices on heart rate variability, rating of perceived exertion, blood lactate accumulation, and salivary cortisol production during a competitive training session. Twelve highly trained elite female athletes (age: 21.0±3.6 years) participated in the study. Fatigue markers were assessed at the beginning and at the end of the 3rd and 5th afternoon TS for that week, once with and once without an intra-oral device, in random order. Salivary cortisol levels were higher in relation to the baseline in the intra-oral device condition (P<0.05) but not in athletes without an intra-oral device. No differences between conditions were found in rating of perceived exertion (P=0.465) and blood lactate (P=0.711). No time or condition interactions or main effects were shown for heart rate variability. Thus, there is no evidence that wearing a low-arch intra-oral device is a good recommendation for high-standard athletes performing long and stressful routines.

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