Does moderate hypoxia alter working memory and executive function during prolonged exercise?

Komiyama, Tokutaro; Sudo, Mizuki; Higaki, Yasuki; Kiyonaga, Akira; Tanaka, Hiroaki; Andò, Sebastiano

doi:10.1016/j.physbeh.2014.11.057

Cited by 60 publications

(77 citation statements)

References 40 publications

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“…In the current study, rSo 2 significantly decreased during rest in hypoxia which is in agreement with previous reports (Ando et al, 2013;Komiyama et al, 2015). Cerebral oxygenation was further decreased during exercise in hypoxia which confirms the previous finding of exercise-induced reduction in rSo 2 in mild hypoxia (15% and 18% O 2 ).…”

Section: Cognitive and Physiological Measurements At Rest In Hypoxiasupporting

confidence: 93%

“…The data support these previous investigations in that some of our indices of cognitive function were impaired during at the B-Hypo compared to B-Norm. Specifically, we did not observe a significantly impaired mean reaction time and % correct in GNT, which is based primarily on motor reaction time (Etnier and Chang 2009;Lambourne and Tomporowski, 2010;Komiyama et al, 2015). However, our data indicated a significantly impaired % correct and throughput score of RMCPT at the B-Hypo compared to B-Norm.…”

Section: Cognitive and Physiological Measurements At Rest In Hypoxiacontrasting

confidence: 67%

“…A limitation of this study may be the small sample size, although previous study reported improvement in reaction time in Go/No-Go task with sixteen and twelve participants (Ando et al, 2013;Komiyama et al, 2015). Indeed, retrospective power analysis with the current 16 subjects, determined based on the analysis of the reaction time (96.1 -2.5 vs. 94.5 -2.8), the percent correct (96.5 -3.0 vs. 91.8 -4.5), and throughput score (110 -14.3 vs. 103.6 -14.8) in RMCPT, showed the study power of 0.73, 0.98, and 0.88, respectively.…”

Section: Cognitive and Physiological Measurements During Exercise In mentioning

confidence: 96%

“…Although improvements of cognitive performance have been observed during submaximal exercise (low to moderate intensities) in normoxia by numerous investigators (Baddeley, 2003;Sibley et al, 2006;Pontifex et al, 2009;Chang et al, 2012;Roig et al, 2013), to our knowledge few studies investigated the effect of acute exercise on cognitive function in hypoxia (Ando et al, 2013;Komiyama et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Exercise on Cognitive Performance in Normobaric Hypoxia

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Burns

Fennell

et al. 2015

High Altitude Medicine & Biology

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Although previous reports indicate that exercise improves cognitive function in normoxia, the influence of exercise on cognitive function in hypoxia is unknown. The purpose of this study was to determine if the impaired cognitive function in hypoxia can be restored by low to moderate intensity exercise. Sixteen young healthy men completed the ANAM versions of the Go/No-Go task (GNT) and Running Memory Continuous Performance Task (RMCPT) in normoxia to serve as baseline (B-Norm) (21% O2). Following 60 minutes of exposure to normobaric hypoxia (B-Hypo) (12.5% O2), these tests were repeated at rest and during cycling exercise at 40% and 60% of adjusted Vo2max. At B-Hypo, the % correct (p≤0.001) and throughput score (p≤0.001) in RMCPT were significantly impaired compared to B-Norm. During exercise at 40% (p=0.023) and 60% (p=0.006) of adjusted Vo2max, the throughput score in RMCPT improved compared to B-Hypo, and there was no significant difference in throughput score between the two exercise intensities. Mean reaction time also improved at both exercise intensities compared to B-Hypo (p≤0.028). Both peripheral oxygen saturation (Spo2) and regional cerebral oxygen saturation (rSo2) significantly decreased during B-Hypo (p≤0.001) and further decreased at 40% (p≤0.05) and 60% (p≤0.039) exercise. There was no significant difference in Spo2 or rSo2 between two exercise intensities. These data indicate that low to moderate exercise (i.e., 40%-60% adjusted Vo2max) may attenuate the risk of impaired cognitive function that occurs in hypoxic conditions.

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Section: Cognitive and Physiological Measurements At Rest In Hypoxiasupporting

confidence: 93%

Section: Cognitive and Physiological Measurements At Rest In Hypoxiacontrasting

confidence: 67%

Section: Cognitive and Physiological Measurements During Exercise In mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Exercise on Cognitive Performance in Normobaric Hypoxia

Seo

Burns

Fennell

et al. 2015

High Altitude Medicine & Biology

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“…The participants performed a combination of the Spatial delayed response (Spatial DR) task and the Go/No-Go task [25, 26], where working memory and executive function were required. The participants performed the cognitive task while they faced a computer display at a viewing distance of approximately 80 cm on a cycle ergometer (75XLII, COMBI Wellness, Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

The effects of temporal neck cooling on cognitive function during strenuous exercise in a hot environment: a pilot study

et al. 2015

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BackgroundHeat stress potentially has detrimental effects on brain function. Hence, cognitive function may be impaired during physical activity in a hot environment. Skin cooling is often applied in a hot environment to counteract heat stress. However, it is unclear to what extent neck cooling is effective for cognitive impairment during exercise in a hot environment. The purpose of this study was to examine the effects of temporal neck cooling on cognitive function during strenuous exercise in a hot environment.MethodsEight male young participants (mean ± SD, age = 26.1 ± 3.2 years; peak oxygen uptake = 45.6 ± 5.2 ml/kg/min) performed Spatial delayed response (DR) task (working memory) and Go/No-Go task (executive function) at rest and during exercise in the Hot and Hot + Cooling conditions. After the participants completed the cognitive tasks at rest, they cycled the ergometer until their heart rate (HR) reached 160 beats/min. Then, they cycled for 10 min while keeping their HR at 160 beats/min. The cognitive tasks were performed 3 min after their HR reached 160 beats/min. The air temperature was maintained at 35°C and the relative humidity was controlled at 70%. Neck cooling was applied to the backside of the neck by a wet towel and fanning. We used accuracy of the Spatial DR and Go/No-Go tasks and reaction time in the Go/No-Go task to assess cognitive function.ResultsNeck cooling temporarily decreased the skin temperature during exercise. The accuracy of the cognitive tasks was lower during exercise than that at rest in the Hot and Hot + Cooling condition (p < 0.05). There were no differences in the accuracy between the Hot and Hot + Cooling conditions (p = 0.98). Neither exercise (p = 0.40) nor cooling (p = 0.86) affected reaction time. These results indicate that temporal neck cooling did not alter cognitive function during strenuous exercise in a hot environment.ConclusionsThe present study suggests that temporal neck cooling with a wet towel and fanning is not effective for attenuating impairment of working memory and executive function during strenuous exercise with a short duration in a warm and humid environment.

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