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Climacteric. 2014 Jun;17(3):285-93. doi: 10.3109/13697137.2013.828196. Epub 2013 Sep 3.

Phototherapy during treadmill training improves quadriceps performance in postmenopausal women.

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  • 1* Optics Group from Physics Institute of São Carlos, University of São Paulo , Brazil.

Abstract

OBJECTIVE:

To evaluate the effects of infrared-light-emitting diode (LED) during treadmill training on functional performance.

METHODS:

Thirty postmenopausal women aged 50-60 years were randomly assigned to one of three groups and successfully completed the full study. The three groups were: (1) the LED group, which performed treadmill training associated with phototherapy (n = 10); (2) the exercise group, which carried out treadmill training only (n = 10); and (3) the sedentary group, which neither performed physical training nor underwent phototherapy (n = 10). Training was performed over a period of 6 months, twice a week for 45 min per session at 85-90% of maximal heart rate, which was obtained during progressive exercise testing. The irradiation parameters were 100 mW, 39 mW/cm(2) and 108 J/cm(2) for 45 min. Quadriceps performance was measured during isokinetic exercise testing at 60°/s and 300°/s.

RESULTS:

Peak torque did not differ amongst the groups. However, the results showed significantly higher values of power and total work for the LED group (∆ = 21 ± 6 W and ∆ = 634 ± 156 J, p < 0.05) when compared to both the exercise group (∆ = 13 ± 10 W and = 410 ± 270 J) and the sedentary group (∆ = 10 ± 9 W and ∆ = 357 ± 327 J). Fatigue was also significantly lower in the LED group (∆ = -7 ± 4%, p < 0.05) compared to both the exercise group (∆ = 3 ± 8%) and the sedentary group (∆ = -2 ± 6%).

CONCLUSIONS:

Infrared-LED during treadmill training may improve quadriceps power and reduce peripheral fatigue in postmenopausal women.

KEYWORDS:

INFRARED; MUSCLE PERFORMANCE; PHOTOTHERAPY; PHYSICAL TRAINING; POSTMENOPAUSE

PMID:
23895414
[PubMed - indexed for MEDLINE]
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