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document
Infrared LED irradiation applied during high-intensity treadmill training improves maximal exercise tolerance in postmenopausal women : a 6-month longitudinal study . Reduced aerobic fitness is associated with an increased risk of cardiovascular diseases among the older population . The aim of this study was to investigate the effects of LED irradiation ( 850 nm ) applied during treadmill training on the maximal exercise tolerance in postmenopausal women . At the beginning of the study , 45 postmenopausal women were assigned randomly to three groups , and 30 women completed the entire 6 months of the study . The groups were : ( 1 ) the LED group ( treadmill training associated with phototherapy , n = 10 ) , ( 2 ) the exercise group ( treadmill training , n = 10 ) , and ( 3 ) the sedentary group ( neither physical training nor phototherapy , n = 10 ) . The training was performed for 45 min twice a week for 6 months at intensities between 85 % and 90 % maximal heart rate ( HRmax ) . The irradiation parameters were 39 mW/cm ( 2 ) , 45 min and 108 J/cm ( 2 ) . The cardiovascular parameters were measured at baseline and after 6 months . As expected , no significant differences were found in the sedentary group ( p ≥ 0.05 ) . The maximal time of tolerance ( Tlim ) , metabolic equivalents ( METs ) and Bruce stage reached significantly higher values in the LED group and the exercise group ( p < 0.01 ) . Furthermore , the HR , double product and Borg score at isotime were significantly lower in the LED group and in the exercise group ( p < 0.05 ) . However , the time of recovery showed a significant decrease only in the LED group ( p = 0.003 ) . Moreover , the differences between before and after training ( delta values ) for the Tlim , METs and HR at isotime were greater in the LED group than in the exercise group with a significant intergroup difference ( p < 0.05 ) . Therefore , the infrared LED irradiation during treadmill training can improve maximal performance and post-exercise recovery in postmenopausal women .
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Intervention_Physical
Infrared LED irradiation
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Intervention_Physical
LED irradiation
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Outcome_Physical
maximal exercise tolerance
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Outcome_Other
effects
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Outcome_Physical
maximal exercise tolerance