Limits...
Acute Supramaximal Exercise Increases the Brain Oxygenation in Relation to Cognitive Workload.

Bediz CS, Oniz A, Guducu C, Ural Demirci E, Ogut H, Gunay E, Cetinkaya C, Ozgoren M - Front Hum Neurosci (2016)

Bottom Line: When performers were compared, in the HP group, the oxy-Hb values in post-exercise 2-Back test were significantly higher than those in pre-exercise 2-Back test.HP had significantly higher post-exercise oxy-Hb change (Δ) than those of LP.This can become a valuable parameter for future studies on human factor.

View Article: PubMed Central - PubMed

Affiliation: Department of Physiology, Faculty of Medicine, Dokuz Eylul UniversityIzmir, Turkey; Department of Biophysics, Faculty of Medicine, Dokuz Eylul UniversityIzmir, Turkey.

ABSTRACT
Single bout of exercise can improve the performance on cognitive tasks. However, cognitive responses may be controversial due to different type, intensity, and duration of exercise. In addition, the mechanism of the effect of acute exercise on brain is still unclear. This study was aimed to investigate the effects of supramaximal exercise on cognitive tasks by means of brain oxygenation monitoring. The brain oxygenation of Prefrontal cortex (PFC) was measured on 35 healthy male volunteers via functional near infrared spectroscopy (fNIRS) system. Subjects performed 2-Back test before and after the supramaximal exercise wingate anerobic test (WAnT) lasting 30-s on cycle ergometer. The PFC oxygenation change evaluation revealed that PFC oxygenation rise during post-exercise 2-Back task was considerably higher than those in pre-exercise 2-Back task. In order to describe the relationship between oxygenation change and exercise performance, subjects were divided into two groups as high performers (HP) and low performers (LP) according to their peak power values (PP) obtained from the supramaximal test. The oxy-hemoglobin (oxy-Hb) values were compared between pre- and post-exercise conditions within subjects and also between subjects according to peak power. When performers were compared, in the HP group, the oxy-Hb values in post-exercise 2-Back test were significantly higher than those in pre-exercise 2-Back test. HP had significantly higher post-exercise oxy-Hb change (Δ) than those of LP. In addition, PP of the total group were significantly correlated with Δoxy-Hb.The key findings of the present study revealed that acute supramaximal exercise has an impact on the brain oxygenation during a cognitive task. Also, the higher the anerobic PP describes the larger the oxy-Hb response in post-exercise cognitive task. The current study also demonstrated a significant correlation between peak power (exercise load) and post-exercise hemodynamic responses (oxy-, deoxy- and total-Hb). The magnitude of this impact might be related with the physical performance capacities of the individuals. This can become a valuable parameter for future studies on human factor.

No MeSH data available.


Related in: MedlinePlus

The demonstration of oxy- and deoxy-Hb levels in central PFC area during pre- and post-exercise 2-Back tests for group averages. Standard deviations are also marked in line with average as vertical lines (Note that only positive deflection is displayed for the sake of simplicity). The four panels are divided into performers (low and high performance, left and right consequently) and oxy- and deoxy-Hb (upper and lower consequently). Left panel indicated oxy-Hb and right panel deoxy-Hb results. Vertical scale denotes the strength of fNIRS signal in μMolar units, which is normalized to baseline. Horizontal scale denotes the time scale in minutes Vertical dashed lines denote pre-, during and post- exercise onsets and durations. The dotted lines represent the periods of warm-up and cool-down.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4837702&req=5

Figure 4: The demonstration of oxy- and deoxy-Hb levels in central PFC area during pre- and post-exercise 2-Back tests for group averages. Standard deviations are also marked in line with average as vertical lines (Note that only positive deflection is displayed for the sake of simplicity). The four panels are divided into performers (low and high performance, left and right consequently) and oxy- and deoxy-Hb (upper and lower consequently). Left panel indicated oxy-Hb and right panel deoxy-Hb results. Vertical scale denotes the strength of fNIRS signal in μMolar units, which is normalized to baseline. Horizontal scale denotes the time scale in minutes Vertical dashed lines denote pre-, during and post- exercise onsets and durations. The dotted lines represent the periods of warm-up and cool-down.

Mentions: In addition to these findings, the changes of oxy-Hb, deoxy-Hb, and total-Hb were compared between HP and LP groups via independent samples t-test (Table 3). While comparing the oxygenation changes (Δoxy-Hb) of the LP and HP group, PFC oxygenation rise in central PFC (p < 0.01) and left PFC (p < 0.05) areas were found significantly higher in HP group. While comparing the deoxygenation changes (Δdeoxy-Hb) of pre- and post-exercise 2-Back tests, HP group’s PFC deoxygenation changes in central PFC area was found significantly higher (p < 0.05). While comparing the total-Hb changes (Δtotal-Hb) of pre- and post-exercise 2-Back tests, HP group’s PFC total-Hb change in central PFC (p < 0.01) and left PFC (p < 0.05) areas were found significantly higher. Moreover, the peak power values (PP) of the total group were significantly correlated with Δoxy-Hb, Δdeoxy-Hb, and Δtotal-Hb values for central PFC area (r = 0.042 p < 0.01; r = 0.035 p < 0.02; r = 0.040 p < 0.01, respectively). The demonstration of average oxy-Hb and deoxy-Hb levels in central PFC area during pre- and post-exercise 2-Back Tests for HP and LP group were given in Figures 4, 5.


Acute Supramaximal Exercise Increases the Brain Oxygenation in Relation to Cognitive Workload.

Bediz CS, Oniz A, Guducu C, Ural Demirci E, Ogut H, Gunay E, Cetinkaya C, Ozgoren M - Front Hum Neurosci (2016)

The demonstration of oxy- and deoxy-Hb levels in central PFC area during pre- and post-exercise 2-Back tests for group averages. Standard deviations are also marked in line with average as vertical lines (Note that only positive deflection is displayed for the sake of simplicity). The four panels are divided into performers (low and high performance, left and right consequently) and oxy- and deoxy-Hb (upper and lower consequently). Left panel indicated oxy-Hb and right panel deoxy-Hb results. Vertical scale denotes the strength of fNIRS signal in μMolar units, which is normalized to baseline. Horizontal scale denotes the time scale in minutes Vertical dashed lines denote pre-, during and post- exercise onsets and durations. The dotted lines represent the periods of warm-up and cool-down.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837702&req=5

Figure 4: The demonstration of oxy- and deoxy-Hb levels in central PFC area during pre- and post-exercise 2-Back tests for group averages. Standard deviations are also marked in line with average as vertical lines (Note that only positive deflection is displayed for the sake of simplicity). The four panels are divided into performers (low and high performance, left and right consequently) and oxy- and deoxy-Hb (upper and lower consequently). Left panel indicated oxy-Hb and right panel deoxy-Hb results. Vertical scale denotes the strength of fNIRS signal in μMolar units, which is normalized to baseline. Horizontal scale denotes the time scale in minutes Vertical dashed lines denote pre-, during and post- exercise onsets and durations. The dotted lines represent the periods of warm-up and cool-down.
Mentions: In addition to these findings, the changes of oxy-Hb, deoxy-Hb, and total-Hb were compared between HP and LP groups via independent samples t-test (Table 3). While comparing the oxygenation changes (Δoxy-Hb) of the LP and HP group, PFC oxygenation rise in central PFC (p < 0.01) and left PFC (p < 0.05) areas were found significantly higher in HP group. While comparing the deoxygenation changes (Δdeoxy-Hb) of pre- and post-exercise 2-Back tests, HP group’s PFC deoxygenation changes in central PFC area was found significantly higher (p < 0.05). While comparing the total-Hb changes (Δtotal-Hb) of pre- and post-exercise 2-Back tests, HP group’s PFC total-Hb change in central PFC (p < 0.01) and left PFC (p < 0.05) areas were found significantly higher. Moreover, the peak power values (PP) of the total group were significantly correlated with Δoxy-Hb, Δdeoxy-Hb, and Δtotal-Hb values for central PFC area (r = 0.042 p < 0.01; r = 0.035 p < 0.02; r = 0.040 p < 0.01, respectively). The demonstration of average oxy-Hb and deoxy-Hb levels in central PFC area during pre- and post-exercise 2-Back Tests for HP and LP group were given in Figures 4, 5.

Bottom Line: When performers were compared, in the HP group, the oxy-Hb values in post-exercise 2-Back test were significantly higher than those in pre-exercise 2-Back test.HP had significantly higher post-exercise oxy-Hb change (Δ) than those of LP.This can become a valuable parameter for future studies on human factor.

View Article: PubMed Central - PubMed

Affiliation: Department of Physiology, Faculty of Medicine, Dokuz Eylul UniversityIzmir, Turkey; Department of Biophysics, Faculty of Medicine, Dokuz Eylul UniversityIzmir, Turkey.

ABSTRACT
Single bout of exercise can improve the performance on cognitive tasks. However, cognitive responses may be controversial due to different type, intensity, and duration of exercise. In addition, the mechanism of the effect of acute exercise on brain is still unclear. This study was aimed to investigate the effects of supramaximal exercise on cognitive tasks by means of brain oxygenation monitoring. The brain oxygenation of Prefrontal cortex (PFC) was measured on 35 healthy male volunteers via functional near infrared spectroscopy (fNIRS) system. Subjects performed 2-Back test before and after the supramaximal exercise wingate anerobic test (WAnT) lasting 30-s on cycle ergometer. The PFC oxygenation change evaluation revealed that PFC oxygenation rise during post-exercise 2-Back task was considerably higher than those in pre-exercise 2-Back task. In order to describe the relationship between oxygenation change and exercise performance, subjects were divided into two groups as high performers (HP) and low performers (LP) according to their peak power values (PP) obtained from the supramaximal test. The oxy-hemoglobin (oxy-Hb) values were compared between pre- and post-exercise conditions within subjects and also between subjects according to peak power. When performers were compared, in the HP group, the oxy-Hb values in post-exercise 2-Back test were significantly higher than those in pre-exercise 2-Back test. HP had significantly higher post-exercise oxy-Hb change (Δ) than those of LP. In addition, PP of the total group were significantly correlated with Δoxy-Hb.The key findings of the present study revealed that acute supramaximal exercise has an impact on the brain oxygenation during a cognitive task. Also, the higher the anerobic PP describes the larger the oxy-Hb response in post-exercise cognitive task. The current study also demonstrated a significant correlation between peak power (exercise load) and post-exercise hemodynamic responses (oxy-, deoxy- and total-Hb). The magnitude of this impact might be related with the physical performance capacities of the individuals. This can become a valuable parameter for future studies on human factor.

No MeSH data available.


Related in: MedlinePlus