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Lasers Med Sci. 2016 Aug;31(6):1151-60. doi: 10.1007/s10103-016-1962-3. Epub 2016 May 25.

Cognitive enhancement by transcranial laser stimulation and acute aerobic exercise.

Author information

1
Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX, 78712, USA.
2
Department of Psychology and Institute for Neuroscience, University of Texas at Austin, 108 E. Dean Keeton Stop A8000, Austin, TX, 78712, USA. gonzalezlima@utexas.edu.

Abstract

This is the first randomized, controlled study comparing the cognitive effects of transcranial laser stimulation and acute aerobic exercise on the same cognitive tasks. We examined whether transcranial infrared laser stimulation of the prefrontal cortex, acute high-intensity aerobic exercise, or the combination may enhance performance in sustained attention and working memory tasks. Sixty healthy young adults were randomly assigned to one of the following four treatments: (1) low-level laser therapy (LLLT) with infrared laser to two forehead sites while seated (total 8 min, 1064 nm continuous wave, 250 mW/cm(2), 60 J/cm(2) per site of 13.6 cm(2)); (2) acute exercise (EX) of high-intensity (total 20 min, with 10-min treadmill running at 85-90 % VO2max); (3) combined treatment (LLLT + EX); or (4) sham control (CON). Participants were tested for prefrontal measures of sustained attention with the psychomotor vigilance task (PVT) and working memory with the delayed match-to-sample task (DMS) before and after the treatments. As compared to CON, both LLLT and EX reduced reaction time in the PVT [F(1.56) = 4.134, p = 0.01, η (2)  = 0.181] and increased the number of correct responses in the DMS [F(1.56) = 4.690, p = 0.005, η (2)  = 0.201], demonstrating a significant enhancing effect of LLLT and EX on cognitive performance. LLLT + EX effects were similar but showed no significantly greater improvement on PVT and DMS than LLLT or EX alone. The transcranial infrared laser stimulation and acute aerobic exercise treatments were similarly effective for cognitive enhancement, suggesting that they augment prefrontal cognitive functions similarly.

KEYWORDS:

Acute aerobic exercise; Cognitive enhancement; Low-level laser therapy; Photobiomodulation; Transcranial laser stimulation

PMID:
27220529
DOI:
10.1007/s10103-016-1962-3
[Indexed for MEDLINE]

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