Determination of second lactate threshold using near-infrared spectroscopy in elite cyclists

2022 ◽  
Author(s):  
José-Antonio Salas-Montoro ◽  
Manuel Mateo March ◽  
Cristóbal Sánchez-Muñoz ◽  
Mikel Zabala
Keyword(s):  
Heart Rate ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Lactate Threshold ◽  
Near Infrared ◽  
Aerobic Power ◽  
Maximal Aerobic Power ◽  
Maximum Heart Rate ◽  
Muscle Oxygen ◽  
Elite Cyclists

The use of near-infrared spectroscopy could be an interesting alternative to other invasive or expensive methods to estimate the second lactate threshold. Our objective was to compare the intensities of the muscle oxygen saturation breakpoint obtained with the Humon Hex and the second lactate threshold in elite cyclists. Ninety cyclists performed a maximal graded exercise test. Blood capillary lactate was obtained at the end of steps and muscle oxygenation was continuously monitored. There were no differences (p>0.05) between muscle oxygen oxygenation breakpoint and second lactate threshold neither in power nor in heart rate, nor when these values were relativized as a percentage of maximal aerobic power or maximum heart rate. There were also no differences when men and women were studied separately. Both methods showed a highly correlation in power (r=0.914), percentage of maximal aerobic power (r=0.752), heart rate (r=0.955), and percentage of maximum heart rate (r=0.903). Bland-Altman resulted in a mean difference of 0.05±0.27 W·kg–1, 0.91±4.93%, 0.63±3.25 bpm, and 0.32±1.69% for power, percentage of maximal aerobic power, heart rate and percentage of maximum heart rate respectively. These findings suggest that Humon may be a non-invasive and low-cost alternative to estimate the second lactate threshold intensity in elite cyclists.

A comparison of exercise type and intensity on the noninvasive assessment of skeletal muscle mitochondrial function using near-infrared spectroscopy

2013 ◽  
Vol 114 (2) ◽  
pp. 230-237 ◽  
Author(s):  
Terence E. Ryan ◽  
Jared T. Brizendine ◽  
Kevin K. McCully
Keyword(s):  
Skeletal Muscle ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Mitochondrial Function ◽  
Rate Constants ◽  
Near Infrared ◽  
Clinical Settings ◽  
Muscle Oxygen ◽  
Muscle Oxygen Consumption ◽  
Intensity Of Exercise

Near-infrared spectroscopy (NIRS) can be used to measure muscle oxygen consumption (mVO2) using arterial occlusions. The recovery rate of mVO2after exercise can provide an index of skeletal muscle mitochondrial function. The purpose of this study was to test the influence of exercise modality and intensity on NIRS measurements of mitochondrial function. Three experiments were performed. Thirty subjects (age: 18–27 yr) were tested. NIRS signals were corrected for blood volume changes. The recovery of mVO2after exercise was fit to a monoexponential curve, and a rate constant was calculated (directly related to mitochondrial function). No differences were found in NIRS rate constants for VOL and ES exercises (2.04 ± 0.57 vs. 2.01 ± 0.59 min−1for VOL and ES, respectively; P = 0.317). NIRS rate constants were independent of the contraction frequency for both VOL and ES (VOL: P = 0.166 and ES: P = 0.780). ES current intensity resulted in significant changes to the normalized time-tension integral (54 ± 11, 82 ± 7, and 100 ± 0% for low, medium, and high currents, respectively; P < 0.001) but did not influence NIRS rate constants (2.02 ± 0.54, 1.95 ± 0.44, 2.02 ± 0.46 min−1for low, medium, and high currents, respectively; P = 0.771). In summary, NIRS measurements of skeletal muscle mitochondrial function can be compared between VOL and ES exercises and were independent of the intensity of exercise. NIRS represents an important new technique that is practical for testing in research and clinical settings.

scholarly journals Emotional modulation of cortical activity during gum-chewing: A functional near-infrared spectroscopy study

2021 ◽  
Author(s):  
Yoko Hasegawa ◽  
Ayumi Sakuramoto ◽  
Joe Sakagami ◽  
Masako Shiramizu ◽  
Tatsuya Suzuki ◽  
...  
Keyword(s):  
Heart Rate ◽  
Prefrontal Cortex ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Muscle Activation ◽  
Near Infrared ◽  
Cortical Activity ◽  
Brain Regions ◽  
Emotional States ◽  
Gum Chewing

Abstract Evidence indicates that distinct brain regions are associated with various emotional states. Cortical activity may be modulated by emotional states that are triggered upon chewing with various flavors. We examined cortical activity during chewing with different tastes/odors using multi-channel near-infrared spectroscopy (NIRS). Thirty-six right-handed subjects participated in a crossover-design trial. Subjects chewed flavorful (palatable) or less flavorful (unpalatable) gum for 5 minutes. During gum-chewing these subjects experienced positive and negative emotions, respectively. Subjects rated the taste/odor/deliciousness of each gum with a visual analog scale. Bilateral hemodynamic responses in the frontal to parietal lobes, bilateral masseter muscle activation, and heart rate were measured during gum-chewing. Data changes during gum-chewing were evaluated. Subjects’ ratings of the tastes and odors of each gum differed (p<0.001). Hemodynamic response changes were significantly elevated in the bilateral primary sensorimotor cortex during gum-chewing, in comparison to resting. The hemodynamic responses of wide brain regions showed little difference between the gum conditions; however, a difference was detected in the corresponding left frontopolar/dorsolateral prefrontal cortex. Muscle activation and heart rate were not significantly different between the gum conditions. Differential processing in the left prefrontal cortex might be responsible for emotional states caused by palatable and unpalatable foods.

scholarly journals Extraction of heart rate from functional near-infrared spectroscopy in infants

2014 ◽  
Vol 19 (6) ◽  
pp. 067010 ◽  
Author(s):  
Katherine L. Perdue ◽  
Alissa Westerlund ◽  
Sarah A. McCormick ◽  
Charles A. Nelson
Keyword(s):  
Heart Rate ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Functional Near Infrared Spectroscopy

scholarly journals Increased prefrontal oxygenation prior to and at the onset of over-ground locomotion in humans

2020 ◽  
Vol 129 (5) ◽  
pp. 1161-1172
Author(s):  
Kanji Matsukawa ◽  
Ryota Asahara ◽  
Kei Ishii ◽  
Mayo Kunishi ◽  
Yurino Yamashita ◽  
...  
Keyword(s):  
Heart Rate ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Positive Relationship ◽  
Near Infrared ◽  
Heart Rate Response ◽  
Central Command ◽  
The Difference ◽  
Over Ground Walking

We found using wireless near-infrared spectroscopy that prefrontal oxygenation increased before the onset of arbitrary over-ground walking, whereas the preexercise increase was absent when walking was suddenly started by cue. The difference in prefrontal oxygenation between start modes (considered related to central command) preceded heart rate response variances and demonstrated a positive relationship with the difference in heart rate. The central command-related prefrontal activity may contribute to cardiac adjustment, synchronized with the beginning of over-ground walking.

scholarly journals Quantitative measurement of muscle oxygen saturation without influence from skin and fat using continuous-wave near infrared spectroscopy

2007 ◽  
Vol 15 (21) ◽  
pp. 13715 ◽  
Author(s):  
Ye Yang ◽  
Olusola Soyemi ◽  
Peter J. Scott ◽  
Michelle R. Landry ◽  
Stuart M. Lee ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Oxygen Saturation ◽  
Near Infrared Spectroscopy ◽  
Quantitative Measurement ◽  
Near Infrared ◽  
Continuous Wave ◽  
Muscle Oxygen

Reproducibility of near-infrared spectroscopy measurements of oxidative function and postexercise recovery kinetics in the medial gastrocnemius muscle

2014 ◽  
Vol 39 (5) ◽  
pp. 521-529 ◽  
Author(s):  
William M. Southern ◽  
Terence E. Ryan ◽  
Mary A. Reynolds ◽  
Kevin McCully
Keyword(s):  
Blood Flow ◽  
Oxygen Consumption ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Plantar Flexion ◽  
Medial Gastrocnemius ◽  
Muscle Oxygen ◽  
Oxidative Function ◽  
Mitochondrial Capacity

The purpose of this study was to assess the reproducibility of resting blood flow, resting oxygen consumption, and mitochondrial capacity in skeletal muscle using near-infrared spectroscopy (NIRS). We also determined the influence of 2 exercise modalities (ergometer and rubber exercise bands) on the NIRS measurements. Fifteen young, healthy participants (5 female, 10 male) were tested on 2 nonconsecutive occasions within an 8-day period. The NIRS device was placed on the medial gastrocnemius. Venous and arterial occlusions were performed to obtain blood flow and oxygen consumption. A series of repeated arterial occlusions was used to measure the recovery kinetics of muscle oxygen consumption after ∼7–10 s of voluntary plantar flexion exercise. Resting blood flow had mean coefficients of variation (CV) of 42% and 38% for bands and ergometer, respectively, and resting metabolism had mean CVs of 17% and 12% for bands and ergometer, respectively. The recovery time constant of oxygen consumption (day 1 bands and ergometer: 23.2 ± 3.7 s, 27.6 ± 6.5 s, respectively; day 2 bands and ergometer: 25.5 ± 5.4 s, 25.0 ± 4.9 s, respectively) had mean CVs of 10% and 11% for bands and ergometer, respectively. We conclude that measurements of oxygen consumption and mitochondrial capacity using NIRS can be obtained with good reproducibility.

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