scholarly journals Reliability and Validity of Ventilatory Threshold and Respiratory Compensation Point Determined by Near‐infrared Spectroscopy

2015 ◽  
Vol 29 (S1) ◽  
Author(s):  
Tieh‐Cheng Fu ◽  
Tso‐Yen Mao ◽  
Jong‐Shyan Wang
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ventilatory Threshold ◽  
Reliability And Validity ◽  
Compensation Point ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation

scholarly journals Oxygenation Threshold Derived from Near-Infrared Spectroscopy: Reliability and Its Relationship with the First Ventilatory Threshold

PLoS ONE ◽  
2016 ◽  
Vol 11 (9) ◽  
pp. e0162914 ◽  
Author(s):  
Stephan van der Zwaard ◽  
Richard T. Jaspers ◽  
Ilse J. Blokland ◽  
Chantal Achterberg ◽  
Jurrian M. Visser ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ventilatory Threshold

Assessment of ventilatory threshold using near-infrared spectroscopy on the gastrocnemius muscle during treadmill running

2010 ◽  
Vol 40 (2) ◽  
pp. 206-211 ◽  
Author(s):  
Eleftherios Karatzanos ◽  
Georgios Paradisis ◽  
Elias Zacharogiannis ◽  
Stavros Tziortzis ◽  
Serafim Nanas
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Gastrocnemius Muscle ◽  
Near Infrared ◽  
Ventilatory Threshold ◽  
Treadmill Running

scholarly journals Using a Portable Near-infrared Spectroscopy Device to Estimate The Second Ventilatory Threshold

2021 ◽  
Author(s):  
Víctor Rodrigo-Carranza ◽  
Fernando González-Mohíno ◽  
Anthony P. Turner ◽  
Sergio Rodriguez-Barbero ◽  
José María González-Ravé
Keyword(s):  
Infrared Spectroscopy ◽  
Gas Exchange ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ventilatory Threshold ◽  
Maximum Heart Rate ◽  
Nirs Data ◽  
Trained Runners ◽  
Healthy Participants

AbstractA breakpoint in a portable near-infrared spectroscopy (NIRS) derived deoxygenated haemoglobin (deoxy[Hb]) signal during an incremental VO2max running test has been associated with the second ventilatory threshold (VT2) in healthy participants. Thus, the aim was to examine the association between this breakpoint (NIRS) and VT2 in well-trained runners. Gas exchange and NIRS data were collected during an incremental VO2max running test for 10 well-trained runners. The breakpoint calculated in oxygen saturation (StO2) and the VT2 were determined and compared in terms relative to %VO2max, absolute speed, VO2, and maximum heart rate (HRmax). There were no significant differences (p>0.05) between the breakpoint in StO2 and VT2 relative to %VO2max (87.00±6.14 and 88.28 ± 3.98 %), absolute speed (15.70±1.42 and 16.10±1.66 km·h−1), VO2 (53.71±15.17 and 54.66±15.57 ml·kg−1·min−1), and%HRmax (90.90±4.17 and 91.84±3.70%). There were large and significant correlations between instruments relative to%VO2max (r=0.68, p<0.05), absolute speed (r=0.86, p<0.001), VO2 (r=0.86, p<0.001), and %HRmax (r=0.69; p<0.05). A Bland and Altman analysis of agreement between instruments resulted in a mean difference of − 1.27±4.49%, −0.40±0.84 km·h−1,−0.90±3.07 ml·kg−1·min−1, and − 0.94±3.14 for %VO2max, absolute speed, VO2, and %HRmax, respectively. We conclude that a portable NIRS determination of the StO2 breakpoint is comparable with VT2 using gas exchange and therefore appropriate for use in determining exercise training above VT2 intensity. This is the first study to analyze the validity with the running mode using a NIRS portable device.

scholarly journals ESTIMATION OF THE VENTILATORY THRESHOLD USING WIRELESS NEAR-INFRARED SPECTROSCOPY AND DISTACE MAXIMUM ANALYSIS

2020 ◽  
Vol 52 (7S) ◽  
pp. 50-50
Author(s):  
David Lawson ◽  
Ericka Pursley ◽  
Noah Smith ◽  
Kendra Voth ◽  
Trent E. Cayot
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ventilatory Threshold

Perceptually Regulated Exercise Test Allows Determination of V˙O2max and Ventilatory Threshold But Not Respiratory Compensation Point In Trained Runners

2018 ◽  
Vol 39 (04) ◽  
pp. 304-313
Author(s):  
Perrine Truong ◽  
Gregoire Millet ◽  
Boris Gojanovic
Keyword(s):  
Exercise Test ◽  
Ventilatory Threshold ◽  
Compensation Point ◽  
Rating Of Perceived Exertion ◽  
Long Distance ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation ◽  
Graded Exercise Test ◽  
Graded Exercise ◽  
Trained Runners

AbstractThis study aimed to investigate the differences in maximal oxygen uptake (V̇O2max) and submaximal thresholds between a standard graded exercise test (GXT) and a perceptually regulated graded exercise test (PRGXT) in trained runners. Eleven well-trained middle- to long-distance runners performed both tests in a randomized order. PRGXT used incremental “clamps” of rating of perceived exertion (RPE) over 10×1-min stages on an automated treadmill equipped with a sonar sensor allowing them to change their running speed instantly and in a natural way. GXT used fixed 1 km.h−1 increment every minute. Ventilatory threshold (VT) and respiratory compensation point (RCP) were determined using ventilatory equivalents. No differences were found in V̇O2max (68.0 (5.3) vs. 69.5 (5.9) ml·min−1·kg−1, p=0.243), minute ventilation (V̇E) (159.4 (35.0) vs. 162.4 (33.7) l·min−1, p=0.175), heart rate (HR) (188.4 (6.9) vs. 190.7 (5.2) bpm, p=0.254) and speed (21.0 (1.7) vs. 21.1 (2.3) km·h-1, p=0.761) between GXT and PRGXT. At VT, there were no significant differences between GXT and PRGXT for any outcome variables. For 8 of 11 subjects, it was not possible to determine RCP from ventilatory equivalent in PRGXT. GXT appears more relevant for a comprehensive gas analysis in trained runners.

Training-Induced Changes in the Respiratory Compensation Point, Deoxyhemoglobin Break Point, and Maximal Lactate Steady State: Evidence of Equivalence

2020 ◽  
Vol 15 (1) ◽  
pp. 119-125 ◽  
Author(s):  
Erin Calaine Inglis ◽  
Danilo Iannetta ◽  
Daniel A. Keir ◽  
Juan M. Murias
Keyword(s):  
Steady State ◽  
Near Infrared ◽  
Break Point ◽  
Compensation Point ◽  
Maximal Lactate Steady State ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation ◽  
Measured Time ◽  
Comparison Direction ◽  
Induced Changes

Purpose: To evaluate whether the coherence in the oxygen uptake () associated with the respiratory compensation point (RCP), near-infrared spectroscopy-derived muscle deoxyhemoglobin ([HHb]) break point ([HHb]BP), and maximal lactate steady state (MLSS) would persist at the midpoint and endpoint of a 7-month training and racing season. Methods: Eight amateur male cyclists were tested in 3 separate phases over the course of a cycling season (PRE, MID, and POST). Testing at each phase included a ramp-incremental test to exhaustion to determine RCP and [HHb]BP. The PRE and POST phases also included constant power output rides to determine MLSS. Results: Compared with PRE, at both RCP and [HHb]BP was greater at MID (delta: RCP 0.23 [0.14] L·min−1, [HHb]BP 0.33 [0.17] L·min−1) and POST (delta: RCP 0.21 [0.12], [HHb]BP 0.30 [0.14] L·min−1) (P < .05). at MLSS also increased from PRE to POST (delta: 0.17 [12] L·min−1) (P < .05). was not different at RCP, [HHb]BP, and MLSS at PRE (3.74 [0.34], 3.64 [0.40], 3.78 [0.23] L·min−1) or POST (3.96 [0.25], 3.95 [0.32], 3.94 [0.18] L·min−1) respectively, and RCP (3.98 [0.33] L·min−1) and [HHb]BP (3.97 [0.34] L·min−1) were not different at MID (P > .05). PRE–MID and PRE–POST changes in associated with RCP, [HHb]BP, and MLSS were strongly correlated (range: r = .85–.90) and demonstrated low mean bias (range = −.09 to .12 L·min−1). Conclusions: At all measured time points, at RCP, [HHb]BP, and MLSS were not different. Irrespective of phase comparison, direction, or magnitude of changes, intraindividual changes between each index were strongly related, indicating that interindividual differences were reflected in the group mean response and that their interrelationships are beyond coincidental.

scholarly journals PPeak oxygen uptake differentiates competitive from recreational male surfboard riders

Motricidade ◽  
2018 ◽  
Vol 13 (4) ◽  
pp. 39
Author(s):  
Nuno Almeida ◽  
Joana Reis ◽  
João Beckert ◽  
Miguel Moreira ◽  
Francisco Alves
Keyword(s):  
Oxygen Uptake ◽  
Body Mass ◽  
Power Output ◽  
Aerobic Power ◽  
Ventilatory Threshold ◽  
Peak Oxygen Uptake ◽  
Maximal Aerobic Power ◽  
Compensation Point ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation

The purpose of this study was to verify if competitive performance status was associated to different levels of specific aerobic fitness in Portuguese surfboard riders. Six recreational surfers (age: 32.3±3.1 years; body mass: 73.2±7.8kg; height: 1.75±0.05m) and six competitive international level surfers (age: 25±8.4years; body mass: 68.5±3.8kg; height: 1.74±0.05m) performed a maximal continuous incremental paddling test consisting of two-minute steps starting at 20W, with increments of 10W, for determination of peak oxygen uptake and maximal aerobic power. Ventilatory threshold and respiratory compensation point with corresponding heart rate and power output were also determined. Elite surfers presented higher values for peak oxygen uptake (43.6±7.9 ml.kg-1.min-1) than recreational surfers (31.1±7.4 ml.kg-1.min-1, p=0.01) however, there were no differences (p> 0.05) between groups for maximal aerobic power (elite: 76.6±18.6W; recreational: 76.6±16.6W). No significant differences between the power output at which ventilatory threshold or respiratory compensation point occurred but elite surfers reached ventilation threshold with 22.5±5.8 ml.kg-1.min-1 which was significantly higher than recreational surfers (16±3.7 ml.kg-1.min-1). These findings show that elite surfers have higher values of peak oxygen uptake than recreational surfers which suggest a higher aerobic adaptation that may be related to the different amount of exercise volume undertaken.

scholarly journals Imagery Use and Affective Responses During Exercise: An Examination of Cerebral Hemodynamics Using Near-Infrared Spectroscopy

2013 ◽  
Vol 35 (5) ◽  
pp. 503-513 ◽  
Author(s):  
Gavin Tempest ◽  
Gaynor Parfitt
Keyword(s):  
Infrared Spectroscopy ◽  
Frontal Cortex ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ventilatory Threshold ◽  
Cerebral Hemodynamics ◽  
Affective Responses ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise ◽  
Control Activity

Imagery, as a cognitive strategy, can improve affective responses during moderate-intensity exercise. The effects of imagery at higher intensities of exercise have not been examined. Further, the effect of imagery use and activity in the frontal cortex during exercise is unknown. Using a crossover design (imagery and control), activity of the frontal cortex (reflected by changes in cerebral hemodynamics using near-infrared spectroscopy) and affective responses were measured during exercise at intensities 5% above the ventilatory threshold (VT) and the respiratory compensation point (RCP). Results indicated that imagery use influenced activity of the frontal cortex and was associated with a more positive affective response at intensities above VT, but not RCP to exhaustion (p < .05). These findings provide direct neurophysiological evidence of imagery use and activity in the frontal cortex during exercise at intensities above VT that positively impact affective responses.

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