Leg- vs arm-cycling repeated sprints with blood flow restriction and systemic hypoxia

2019 ◽  
Vol 119 (8) ◽  
pp. 1819-1828 ◽  
Author(s):  
Sarah J. Willis ◽  
Fabio Borrani ◽  
Grégoire P. Millet
Keyword(s):  
Blood Flow ◽  
Blood Flow Restriction ◽  
Repeated Sprints ◽  
Flow Restriction ◽  
Arm Cycling ◽  
Systemic Hypoxia

Neuromuscular evaluation of arm-cycling repeated sprints under hypoxia and/or blood flow restriction

2019 ◽  
Vol 119 (7) ◽  
pp. 1533-1545 ◽  
Author(s):  
Arthur Peyrard ◽  
Sarah J. Willis ◽  
Nicolas Place ◽  
Grégoire P. Millet ◽  
Fabio Borrani ◽  
...  
Keyword(s):  
Blood Flow ◽  
Blood Flow Restriction ◽  
Repeated Sprints ◽  
Flow Restriction ◽  
Arm Cycling

Effects of Active Preconditioning With Local and Systemic Hypoxia on Submaximal Cycling

2021 ◽  
pp. 1-6
Author(s):  
Olivier Girard ◽  
Romain Leuenberger ◽  
Sarah J. Willis ◽  
Fabio Borrani ◽  
Grégoire P. Millet
Keyword(s):  
Blood Flow ◽  
Arterial Oxygen Saturation ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Blood Flow Restriction ◽  
Arterial Oxygen ◽  
Total Occlusion ◽  
Flow Restriction ◽  
Cycling Efficiency ◽  
Systemic Hypoxia

Purpose: The authors compared the effects of active preconditioning with local and systemic hypoxia during submaximal cycling. Methods: On separate visits, 14 active participants completed 4 trials. Each visit was composed of 1 preconditioning phase followed, after 40 minutes of rest, by 3 × 6-minute cycling bouts (intensity = 85% of critical power; rest = 6 min). The preconditioning phase consisted of 4 × 5-minute cycling bouts at 1.5 W·kg−1 (rest = 5 min) in 4 conditions: control (no occlusion and normoxia), blood flow restriction (60% of total occlusion), HYP (systemic hypoxia; inspired fraction of oxygen = 13.6%), and blood flow restriction + HYP (local and systemic hypoxia combined). Results: During the preconditioning phase, there were main effects of both systemic (all P < .014) and local hypoxia (all P ≤ .001) on heart rate, arterial oxygen saturation, leg discomfort, difficulty of breathing, and blood lactate concentration. Cardiorespiratory variables, gross efficiency, energy cost, and energy expenditure during the last minute of 6-minute cycling bouts did not differ between conditions (all P > .105). Conclusion: Local and systemic hypoxic stimuli, or a combination of both, during active preconditioning did not improve physiological responses such as cycling efficiency during subsequent submaximal cycling.

Insights for Blood Flow Restriction and Hypoxia in Leg Versus Arm Submaximal Exercise

2020 ◽  
Vol 15 (5) ◽  
pp. 714-719
Author(s):  
Sarah J. Willis ◽  
Grégoire P. Millet ◽  
Fabio Borrani
Keyword(s):  
Blood Flow ◽  
Oxygen Delivery ◽  
Vascular Reactivity ◽  
Near Infrared ◽  
Biceps Brachii ◽  
Submaximal Exercise ◽  
Blood Flow Restriction ◽  
Arterial Oxygen ◽  
Flow Restriction ◽  
Arm Cycling

Purpose: To assess tissue oxygenation, along with metabolic and physiological responses during blood flow restriction (BFR, bilateral vascular occlusion) and systemic hypoxia conditions during submaximal leg- versus arm-cycling exercise. Methods: In both legs and arms, 4 randomized sessions were performed (normoxia 400 m, fraction of inspired oxygen [FIO2] 20.9% and normobaric hypoxia 3800 m, FIO2 13.1% [0.1%]; combined with BFR at 0% and 45% of resting pulse elimination pressure). During each session, a single 6-minute steady-state submaximal exercise was performed to measure physiological changes and oxygenation (near-infrared spectroscopy) of the muscle tissue in both the vastus lateralis (legs) and biceps brachii (arms). Results: Total hemoglobin concentration ([tHb]) was 65% higher (P < .001) in arms versus legs, suggesting that arms had a greater blood perfusion capacity than legs. Furthermore, there were greater changes in tissue blood volume [tHb] during BFR compared with control conditions (P = .017, F = 5.45). The arms elicited 7% lower tissue saturation (P < .001) and were thus more sensitive to the hypoxia-induced reduction in oxygen supply than legs, no matter the condition. This indicates that legs and arms may elicit different regulatory hemodynamic mechanisms (ie, greater blood flow in arms) for limiting the decreased oxygen delivery during exercise with altered arterial oxygen content. Conclusions: The combination of BFR and/or hypoxia led to increased [tHb] in both limbs likely due to greater vascular resistance; further, arms were more responsive than legs. This possibly influences the maintenance of oxygen delivery and enhances perfusion pressure, suggesting greater vascular reactivity in arms than in legs.

Exercise with blood flow restriction as a new tool for health improvement in hypertensive elderly women: the role of purinergic enzymes

2020 ◽  
Vol 60 (11) ◽  
Author(s):  
Aline Mânica ◽  
Clodoaldo A. De SÁ ◽  
Angélica Barili ◽  
Vanessa S. Corralo ◽  
Beatriz S. Bonadiman ◽  
...  
Keyword(s):  
Blood Flow ◽  
Elderly Women ◽  
Blood Flow Restriction ◽  
Health Improvement ◽  
Flow Restriction
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