Effects of combined hot and hypoxic conditions on muscle blood flow and muscle oxygenation during repeated cycling sprints

Yamaguchi, Keiichi; Sumi, Daichi; Hayashi, Nanako; Ota, Naoki; Ienaga, Koki; Goto, Kazushige

doi:10.1007/s00421-021-04738-w

Cited by 16 publications

(19 citation statements)

References 41 publications

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“…While ΔTSI was lower in HH during 15-s maximal sprints, a previous study reported that reduction of TSI during repeated-cycling sprints did not differ between hypoxic-only and combined hot and hypoxic environments (Yamaguchi et al, 2021). The differences in exercise regimen (three 15-s sprints in the present study vs. three sets of 5 × 6-s sprints in the previous study), pre-exercise exposure duration (30-min in the present study vs. 5-min in the previous study), and subjective characteristics (track and field sprinters in the present study vs. active males in the previous study) would be potential reasons for inconsistent results.…”

Section: Discussionmentioning

confidence: 68%

“…Yatsutani et al (2020) reported that the tissue saturation index (TSI) during 60-min moderate-intensity cycling tended to be lower in hot hypoxic than thermoneutral hypoxic environments. On the other hand, Yamaguchi et al (2021) failed to observe larger deoxygenation during repeated cycling sprints in a hot hypoxic environment compared with a thermoneutral hypoxic environment. The magnitude of exercise-induced muscle deoxygenation is related to exercise intensity and duration (Racinais et al, 2014;Shibuya et al, 2004), therefore the effect of combined hot and hypoxia on muscle oxygenation may also depend on exercise intensity and regimen utilized.…”

Section: Introductionmentioning

confidence: 73%

“…The magnitude of exercise-induced muscle deoxygenation is related to exercise intensity and duration (Racinais et al, 2014;Shibuya et al, 2004), therefore the effect of combined hot and hypoxia on muscle oxygenation may also depend on exercise intensity and regimen utilized. Although muscle oxygenation during repeated-sprint exercise (≤ 10 s) in hypoxia-only (Billaut and Buchheit, 2013;Willis et al, 2017) and combined hot and hypoxia (Yamaguchi et al, 2021) have been previously examined, muscle oxygenation response during longer sprint exercise (> 10 s) is still unknown. Track and field sprinters typically incorporate sprint interval exercise, in particular a relatively longer duration of sprints (15-30 s) with complete recovery, into their training routines.…”

Section: Introductionmentioning

confidence: 99%

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A Combined Hot and Hypoxic Environment during Maximal Cycling Sprints Reduced Muscle Oxygen Saturation: A Pilot Study

Yamaguchi¹,

Imai²,

Yatsutani³

et al. 2021

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The present study investigated the effects of a combined hot and hypoxic environment on muscle oxygenation during repeated 15-s maximal cycling sprints. In a single-blind, cross-over study, nine trained sprinters performed three 15-s maximal cycling sprints interspersed with 7-min passive recovery in normoxic (NOR; 23℃, 50%, FiO2 20.9%), normobaric hypoxic (HYP; 23℃, FiO2 14.5%), and hot normobaric hypoxic (HH; 35℃, FiO2 14.5%) environments. Relative humidity was set to 50% in all trials. The vastus lateralis muscle oxygenation was evaluated during exercise using near-infrared spectroscopy. The oxygen uptake (VO2) and arterial oxygen saturation (SpO2) were also monitored. There was no significant difference in peak or mean power output among the three conditions. The reduction in tissue saturation index was significantly greater in the HH (-17.0 ± 2.7%) than in the HYP (-10.4 ± 2.8%) condition during the second sprint (p < 0.05). The average VO2 and SpO2 were significantly lower in the HYP (VO2 = 980 ± 52 mL/min, SpO2 = 82.9 ± 0.8%) and HH (VO2 = 965 ± 42 mL/min, SpO2 = 83.2 ± 1.2%) than in the NOR (VO2 = 1149 ± 40 mL/min, SpO2 = 90.6 ± 1.4%; p < 0.05) condition. In conclusion, muscle oxygen saturation was reduced to a greater extent in the HH than in the HYP condition during the second bout of three 15-s maximal cycling sprints, despite the equivalent hypoxic stress between HH and HYP.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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A Combined Hot and Hypoxic Environment during Maximal Cycling Sprints Reduced Muscle Oxygen Saturation: A Pilot Study

Yamaguchi¹,

Imai²,

Yatsutani³

et al. 2021

jsportscimed

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“…Blood samples were collected to determine changes in blood glucose and lactate concentrations after each of the three exercise sets, and exercise-related sensations were evaluated simultaneously. The mBF of the vastus lateralis muscle was measured using venous occlusion and near-infrared spectroscopy (NIRS) immediately after exercise completion [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…RSH increases blood perfusion in muscles [ 18 ]. In addition, a previous study reported that exercise-induced peripheral tissue responses (e.g., changes in muscle blood flow and muscle oxygenation) were higher under hypoxic conditions [ 19 ]. In contrast, repeated sprint training with VHL may not improve the muscle oxidative capacity after the training period.…”

Section: Introductionmentioning

confidence: 99%

Comparison of systemic and peripheral responses during high-intensity interval exercise under voluntary hypoventilation vs. hypoxic conditions

Imai¹,

Yamaguchi²,

Goto³

2022

Phys Act Nutr

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[Purpose] This study aimed to determine the systemic and peripheral responses to high-intensity interval exercise (HIIE) with voluntary hypoventilation at low lung volume (VHL) or HIIE under hypoxic conditions.[Methods] Ten male participants completed a single session of HIIE (three sets of 6 × 8-s high-intensity pedaling at 170% of maximal oxygen uptake [VO2max]) under three different conditions: normoxia with normal breathing (NOR: 23 °C, 20.9% of fraction of inspired oxygen [FiO2]), hypoxia with normal breathing (HYP: 23 °C, 14.5% FiO2), and normoxia with VHL (VHL: 23 °C, 20.9% FiO2). A randomized crossover design was used. Power output, arterial oxygen saturation (SpO2), heart rate, and muscle oxygenation were monitored during the exercise and the 16-s recovery. Muscle blood flow (mBF) of the vastus lateralis was also evaluated.[Results] SpO2 during the exercise and the 16-s recovery in the VHL group was significantly lower than in that of the NOR group. However, this parameter in the VHL group was significantly higher than that of the HYP group (NOR: 94.9 ± 0.4%, HYP: 82.8 ± 1.2%, VHL: 90.4 ± 0.5%; p < 0.001). Muscle oxygen saturation was significantly lower in the HYP group than those in the VHL and NOR groups (NOR: 79.6 ± 17.4%, HYP: 65.5 ± 7.7%, VHL: 74.4 ± 7.8%; p = 0.024). No significant difference in this parameter was observed between the VHL and NOR groups (p > 0.05). Additionally, the exercise-induced increase in mBF did not differ significantly among three groups (p > 0.05).[Conclusion] HIIE-induced SpO2 decrease was smaller under hypoxic conditions than during VHL. Moreover, mBF was not enhanced by the addition of VHL during HIIE.

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Adding heat stress to repeated-sprint training in hypoxia does not enhance performance improvements in canoe/kayak athletes

et al. 2022

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Effects of combined hot and hypoxic conditions on muscle blood flow and muscle oxygenation during repeated cycling sprints

Cited by 16 publications

References 41 publications

A Combined Hot and Hypoxic Environment during Maximal Cycling Sprints Reduced Muscle Oxygen Saturation: A Pilot Study

A Combined Hot and Hypoxic Environment during Maximal Cycling Sprints Reduced Muscle Oxygen Saturation: A Pilot Study

Comparison of systemic and peripheral responses during high-intensity interval exercise under voluntary hypoventilation vs. hypoxic conditions

Adding heat stress to repeated-sprint training in hypoxia does not enhance performance improvements in canoe/kayak athletes

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