Muscle Oxygen Saturation Measurements in Diving Mammals and Birds Using NIRS

2013 ◽  
pp. 109-121
Author(s):  
Cassondra L. Williams ◽  
Paul J. Ponganis
Keyword(s):  
Oxygen Saturation ◽  
Muscle Oxygen

Effect of Climbing Speed on Pulmonary Oxygen Uptake and Muscle Oxygen Saturation Dynamics in the Finger Flexors

2021 ◽  
pp. 1-9
Author(s):  
Jan Gajdošík ◽  
Jirˇí Baláš ◽  
Dominika Krupková ◽  
Lukáš Psohlavec ◽  
Nick Draper
Keyword(s):  
Oxygen Uptake ◽  
Oxygen Saturation ◽  
Near Infrared ◽  
Cellular Level ◽  
Gas Analysis ◽  
Whole Body ◽  
Flexor Digitorum Profundus ◽  
Muscle Oxygen ◽  
Sport Climbing ◽  
Body Activity

Purpose: Although sport climbing is a self-paced whole-body activity, speed varies with climbing style, and the effect of this on systemic and localized oxygen responses is not well understood. Therefore, the aim of the present study was to determine muscle and pulmonary oxygen responses during submaximal climbing at differing speeds of ascent. Methods: Thirty-two intermediate and advanced sport climbers completed three 4-minute-long ascents of the same route at 4, 6, and 9 m·min−1 on a motorized climbing ergometer (treadwall) on separate laboratory visits. Gas analysis and near-infrared spectroscopy were used to determine systemic oxygen uptake () and muscle oxygen saturation (StO2) of the flexor digitorum profundus. Results: Increases in ascent speed of 1 m·min−1 led to increases of by 2.4 mL·kg−1·min−1 (95% CI, 2.1 to 2.8 mL·kg−1·min−1) and decreases in StO2 by −1.3% (95% CI, 1.9% to −0.7%). There was a significant interaction of climbing ability and speed for StO2 (P < .001, ). The results revealed that the decrease of StO2 was present for intermediate but not advanced climbers. Conclusions: In this study, the results suggest that demand during climbing was largely determined by climbing speed; however, the ability level of the climber appeared to mitigate StO2 at a cellular level. Coaches and instructors may prescribe climbing ascents with elevated speed to improve generalized cardiorespiratory fitness. To stimulate localized aerobic capacity, however, climbers should perhaps increase the intensity of training ascents through the manipulation of wall angle or reduction of hold size.

Relationship Between Muscle Oxygen Saturation and Exercise Load in Patients with Malignant Hematopoietic Disease

2020 ◽  
pp. 201-207
Author(s):  
Tatsushi Wakasugi ◽  
Shinichiro Morishita ◽  
Katsuji Kaida ◽  
Yusuke Itani ◽  
Kazuhiro Ikegame ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Exercise Load ◽  
Muscle Oxygen

Evaluation of Muscle Oxygen Saturation of Human by Measuring Skin Tissue on Medial Forearm

2021 ◽  
Author(s):  
Hsin-Yi Tsai ◽  
Chih-Chung Yang ◽  
Cheng-Ru Li ◽  
Chun-Han Chou ◽  
Kuo-Cheng Huang ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Skin Tissue ◽  
Muscle Oxygen

The Effects of Blood Flow Restriction on Muscle Activation and Hypoxia in Individuals With Chronic Ankle Instability

2020 ◽  
Vol 29 (5) ◽  
pp. 633-639
Author(s):  
Brian Killinger ◽  
Jakob D. Lauver ◽  
Luke Donovan ◽  
John Goetschius
Keyword(s):  
Blood Flow ◽  
Oxygen Saturation ◽  
Muscle Activation ◽  
Perceived Exertion ◽  
Ankle Instability ◽  
Muscle Oxygen ◽  
Flow Restriction ◽  
Acute Responses ◽  
Muscle Adaptations ◽  
Resistance Exercises

Context: Muscle dysfunction is common in patients with chronic ankle instability (CAI). Blood flow restriction (BFR) may enhance muscle responses during exercise and provide an opportunity to enhance muscle adaptations to ankle rehabilitation exercises; however, there is no evidence examining the effect of BFR on muscle function in CAI patients. Objective: Examine the effects of BFR on muscle activation and oxygen saturation during submaximal ankle eversion and dorsiflexion exercises in individuals with CAI. Design: Cross-over study design. Setting: Laboratory setting. Patients (or Other Participants): Nineteen young adults with a history of CAI. Interventions: Participants performed 4 sets (30, 15, 15, and 15) of eversion and dorsiflexion resistance exercises at 30% of maximum voluntary isometric contraction during 2 conditions, BFR and control. For BFR, a cuff was applied above the knee at 80% of blood flow occlusion. For control, the cuff was not inflated. Main Outcome Measures: Fibularis longus and tibialis anterior electromyography muscle activation, lower-leg muscle oxygen saturation, and ratings of perceived exertion were recorded during exercises. Results: Average grand mean muscle activation was 5.6% greater during eversion (P = .03) and 7.7% greater during dorsiflexion (P = .01) resistance exercises with BFR compared with control; however, the magnitudes of the effects of BFR were only clinically important during the dorsiflexion exercises. Lower-leg muscle oxygen saturation was 31% to 44% lower (P < .001) during BFR exercises. Ratings of perceived exertion were significantly higher during BFR exercises (P < .001). Conclusions: Greater muscle activation and hypoxia were present during submaximal resistance exercise with BFR in participants with CAI. Greater muscle activation and hypoxia during BFR exercises may be important acute responses mediating the training-related muscle adaptations that have been observed with BFR. The presence of these acute responses in CAI patients supports further research examining BFR as a potential ankle rehabilitation tool.

Serial Lower Limb Occlusion and Reperfusion Augments Muscle Oxygen Saturation despite Attenuated Cardiac Hemodynamics

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 672-673
Author(s):  
Afton D. Seeley ◽  
Natasha Cruz ◽  
Jesse S. Brenman ◽  
Kevin A. Jacobs
Keyword(s):  
Oxygen Saturation ◽  
Lower Limb ◽  
Muscle Oxygen ◽  
Cardiac Hemodynamics

Vascular Inflammation, Calf Muscle Oxygen Saturation, and Blood Glucose are Associated With Exercise Pressor Response in Symptomatic Peripheral Artery Disease

Angiology ◽  
2019 ◽  
Vol 70 (8) ◽  
pp. 747-755 ◽  
Author(s):  
Andrew W. Gardner ◽  
Polly S. Montgomery ◽  
Ming Wang ◽  
Chixiang Chen ◽  
Marcos Kuroki ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Glucose ◽  
Oxygen Saturation ◽  
Peripheral Artery Disease ◽  
Pressor Response ◽  
Calf Muscle ◽  
Peripheral Artery ◽  
Muscle Oxygen ◽  
Artery Disease ◽  
Vascular Biomarkers

We determined whether calf muscle oxygen saturation (StO2) and vascular biomarkers of inflammation and oxidative stress were associated with an exercise pressor response during treadmill walking in 179 patients with symptomatic peripheral artery disease (PAD). The exercise pressor response was measured as the change in blood pressure from rest to the end of the first 2-minute treadmill stage (2 mph, 0% grade). There was a wide range in the change in systolic blood pressure (−46 to 50 mm Hg) and in diastolic blood pressure (−23 to 38 mm Hg), with mean increases of 4.3 and 1.4 mm Hg, respectively. In multiple regression analyses, significant predictors of systolic pressure included glucose ( P < .001) and insulin ( P = .039). Significant predictors of diastolic pressure included cultured endothelial cell apoptosis ( P = .019), the percentage drop in exercise calf muscle (StO2; P = .023), high-sensitivity C-reactive protein ( P = .032), and glucose ( P = .033). Higher levels in pro-inflammatory vascular biomarkers, impaired calf muscle StO2 during exercise, and elevated blood glucose were independently associated with greater exercise pressor response in patients with symptomatic PAD. The clinical implication is that exercise and nutritional interventions designed to improve inflammation, microcirculation, and glucose metabolism may also lower blood pressure during exercise in patients with symptomatic PAD.

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