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Photomed Laser Surg. 2011 Sep;29(9):639-45. doi: 10.1089/pho.2010.2961. Epub 2011 Jul 12.

Effects of infrared-LED illumination applied during high-intensity treadmill training in postmenopausal women.

Author information

1
Optics Group from Instituto de Física de São Carlos, University of São Paulo, São Paulo, Brazil. fer.nanda.rp@hotmail.com

Abstract

BACKGROUND DATA:

Technology and physical exercise can enhance physical performance during aging.

OBJECTIVE:

The purpose of this study was to investigate the effects of infrared-light-emitting diode (LED) illumination (850 nm) applied during treadmill training.

MATERIALS AND METHODS:

Twenty postmenopausal women participated in this study. They were randomly divided into two groups. The LED group performed treadmill training associated with infrared-LED illumination (n=10) and the control group performed only treadmill training (n=10). The training was performed during 3 months, twice a week during 30 min at intensities between 85 and 90% of maximal heart rate. The irradiation parameters were 31 mW/cm(2), treatment time 30 min, 14,400 J of total energy and 55.8 J/cm(2) of fluence. Physiological, biomechanical, and body composition parameters were measured at the baseline and after 3 months.

RESULTS:

Both groups improved the time of tolerance limit (Tlim) (p<0.05) during submaximal constant-speed testing. The peak torque did not differ between groups. However, the results showed significantly higher values of power [from 56±10 to 73±8 W (p=0.002)] and total work [from 1,537±295 to 1,760±262 J (p=0.006)] for the LED group when compared to the control group [power: from 58±14 to 60±15 W (p≥0.05) and total work: from 1,504±404 to 1,622±418 J (p≥0.05)]. The fatigue significantly increased for the control group [from 51±6 to 58±5 % (p=0.04)], but not for the LED group [from 60±10 to 60±4 % (p≥0.05)]. No significant differences in body composition were observed for either group.

CONCLUSIONS:

Infrared-LED illumination associated with treadmill training can improve muscle power and delay leg fatigue in postmenopausal women.

PMID:
21749263
DOI:
10.1089/pho.2010.2961
[Indexed for MEDLINE]

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