Acute Mild Hypoxic Hypoxia Effects on Cognitive and Simulated Aircraft Pilot Performance

Bouak, Fethi; Vartanian, Oshin; Hofer, Kevin; Cheung, Bob

doi:10.3357/amhp.5022.2018

Cited by 42 publications

(56 citation statements)

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“…22 Thus, the notion that decreased arterial desaturation is responsible for cognitive impairment appears to be extended to exercising under hypoxia. Both Bouak et al 28 and Shannon et al 32 have previously indicated that cognitive performance was impaired during/after exercise under severe hypoxia, but not moderate hypoxia. 28,32 These findings suggest that the severity of hypoxia is a critical factor in determining cognitive performance when acute exercise is performed in hypoxia.…”

Section: Discussionmentioning

confidence: 98%

“…In contrast, several studies demonstrated that cognitive performance was impaired during, or after, exercise in acute hypoxia. 28 30 reported impaired performance in the memory recognition and flanker task, but not in the N-back task, during exercise in severe hypoxia. Bouak et al 28 examined delayed matching-to-sample test, N-back and Stroop tasks after exercise under hypoxia at four different levels, and cognitive impairment was observed in all tasks under the most severe hypoxic environment.…”

Section: Laboratory Settingmentioning

confidence: 92%

“…In contrast, several studies demonstrated that cognitive performance was impaired during, or after, exercise in acute hypoxia . Dobashi et al reported impaired color‐word Stroop task (CWST) performance after four bouts of moderate exercise in moderate hypoxia.…”

Section: Combined Effects Of Acute Exercise and Hypoxiamentioning

confidence: 99%

“…Lefferts et al reported impaired performance in the memory recognition and flanker task, but not in the N‐back task, during exercise in severe hypoxia. Bouak et al examined delayed matching‐to‐sample test, N‐back and Stroop tasks after exercise under hypoxia at four different levels, and cognitive impairment was observed in all tasks under the most severe hypoxic environment. Furthermore, Shannon et al reported that attention switching and rapid visual information processing task performance was impaired during or after exercise under severe, compared with moderate, hypoxia.…”

Section: Combined Effects Of Acute Exercise and Hypoxiamentioning

confidence: 99%

“…In contrast, spatial span task performance was not impaired in the present study. The results of Bouak et al 28 and Shannon et al 32 suggest that the severity of hypoxia is one of the factors that affect the combined effects of acute exercise and hypoxia on cognitive performance.…”

Section: Laboratory Settingmentioning

confidence: 99%

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The interactive effects of acute exercise and hypoxia on cognitive performance: A narrative review

Andò

Komiyama

Sudo

et al. 2019

Scandinavian Med Sci Sports

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Acute moderate intensity exercise has been shown to improve cognitive performance. In contrast, hypoxia is believed to impair cognitive performance. The detrimental effects of hypoxia on cognitive performance are primarily dependent on the severity and duration of exposure. In this review, we describe how acute exercise under hypoxia alters cognitive performance, and propose that the combined effects of acute exercise and hypoxia on cognitive performance are mainly determined by interaction among exercise intensity and duration, the severity of hypoxia, and duration of exposure to hypoxia. We discuss the physiological mechanism(s) of the interaction and suggest that alterations in neurotransmitter function, cerebral blood flow, and possibly cerebral metabolism are the primary candidates that determine cognitive performance when acute exercise is combined with hypoxia. Furthermore, acclimatization appears to counteract impaired cognitive performance during prolonged exposure to hypoxia although the precise physiological mechanism(s) responsible for this amelioration remain to be elucidated. This review has implications for sporting, occupational, and recreational activities at terrestrial high altitude where cognitive performance is essential. Further studies are required to understand physiological mechanisms that determine cognitive performance when acute exercise is performed in hypoxia.

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Section: Discussionmentioning

confidence: 98%

Section: Laboratory Settingmentioning

confidence: 92%

Section: Combined Effects Of Acute Exercise and Hypoxiamentioning

confidence: 99%

Section: Combined Effects Of Acute Exercise and Hypoxiamentioning

confidence: 99%

Section: Laboratory Settingmentioning

confidence: 99%

See 3 more Smart Citations

The interactive effects of acute exercise and hypoxia on cognitive performance: A narrative review

Andò

Komiyama

Sudo

et al. 2019

Scandinavian Med Sci Sports

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Prefrontal cortex oxygenation during a mentally fatiguing task in normoxia and hypoxia

De Wachter,

Roose,

Proost

et al. 2024

Exp Brain Res

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Mental fatigue (MF) and hypoxia impair cognitive performance through changes in brain hemodynamics. We want to elucidate the role of prefrontal cortex (PFC)-oxygenation in MF. Twelve participants (22.9 ± 3.5 years) completed four experimental trials, (1) MF in (normobaric) hypoxia (MF_HYP) (3.800 m; 13.5%O2), (2) MF in normoxia (MF_NOR) (98 m; 21.0%O2), (3) Control task in HYP (CON_HYP), (4) Control in NOR (CON_NOR). Participants performed a 2-back task, Digit Symbol Substitution test and Psychomotor Vigilance task before and after a 60-min Stroop task or an emotionally neutral documentary. Brain oxygenation was measured through functional Near Infrared Spectroscopy. Subjective feelings of MF and physiological measures (heart rate, oxygen saturation, blood glucose and hemoglobin) were recorded. The Stroop task resulted in increased subjective feelings of MF compared to watching the documentary. 2-back accuracy was lower post task compared to pre task in MF_NOR and CON_NOR, while no differences were found in the other cognitive tasks. The fraction of inspired oxygen did not impact feelings of MF. Although performing the Stroop resulted in higher subjective feelings of MF, hypoxia had no effect on the severity of self-reported MF. Additionally, this study could not provide evidence for a role of oxygenation of the PFC in the build-up of MF.

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A brief bout of exercise in hypoxia reduces ventricular filling rate and stroke volume response during muscle metaboreflex activation

et al. 2020

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Purpose The hemodynamic consequences of exercise in hypoxia have not been completely investigated. The present investigation aimed at studying the hemodynamic effects of contemporary normobaric hypoxia and metaboreflex activation. Methods Eleven physically active, healthy males (age 32.7 ± 7.2 years) completed a cardiopulmonary test on an electromagnetically braked cycle-ergometer to determine their maximum workload (W max). On separate days, participants performed two randomly assigned exercise sessions (3 minutes pedalling at 30% of W max): (1) one in normoxia (NORMO), and (2) one in normobaric hypoxia with FiO 2 set to 13.5% (HYPO). After each session, the following protocol was randomly assigned: either (1) post-exercise muscle ischemia (PEMI) to study the metaboreflex, or (2) a control exercise recovery session, i.e., without metaboreflex activation. Hemodynamics were assessed with impedance cardiography. Results The main result was that the HYPO session impaired the ventricular filling rate (measured as stroke volume/diastolic time) response during PEMI versus control condition in comparison to the NORMO test (31.33 ± 68.03 vs. 81.52 ± 49 .23 ml•s −1 ,respectively, p = 0.003). This caused a reduction in the stroke volume response (1.45 ± 9.49 vs. 10.68 ± 8.21 ml, p = 0.020). As a consequence, cardiac output response was impaired during the HYPO test. Conclusions The present investigation suggests that a brief exercise bout in hypoxia is capable of impairing cardiac filling rate as well as stroke volume during the metaboreflex. These results are in good accordance with recent findings showing that among hemodynamic modulators, ventricular filling is the most sensible variable to hypoxic stimuli.

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Acute Mild Hypoxic Hypoxia Effects on Cognitive and Simulated Aircraft Pilot Performance

Cited by 42 publications

References 0 publications

The interactive effects of acute exercise and hypoxia on cognitive performance: A narrative review

The interactive effects of acute exercise and hypoxia on cognitive performance: A narrative review

Prefrontal cortex oxygenation during a mentally fatiguing task in normoxia and hypoxia

A brief bout of exercise in hypoxia reduces ventricular filling rate and stroke volume response during muscle metaboreflex activation

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