Acute effects of low-level laser therapy irradiation on blood lactate and muscle fatigue perception in hospitalized patients with heart failure-a pilot study

Acute effects of low-level laser therapy irradiation on blood lactate and muscle fatigue perception in hospitalized patients with heart failure-a pilot study

Author Bublitz, Caroline Autor UNIFESP Google Scholar
Muniz Renno, Ana Claudia Autor UNIFESP Google Scholar
Ramos, Rodrigo Santin Autor UNIFESP Google Scholar
Assis, Livia Autor UNIFESP Google Scholar
Cyrillo Sellera, Carlos Alberto Google Scholar
Trimer, Renata Google Scholar
Borghi-Silva, Audrey Google Scholar
Arena, Ross Google Scholar
Guizilini, Solange Autor UNIFESP Google Scholar
Abstract The objective of the present study is to evaluate the acute effects of low-level laser therapy (LLLT) on functional capacity, perceived exertion, and blood lactate in hospitalized patients with heart failure (HF). Patients diagnosed with systolic HF (left ventricular ejection fraction < 45 %) were randomized and allocated prospectively into two groups: placebo LLLT group (n = 10)-subjects who were submitted to placebo laser and active LLLT group (n = 10)-subjects who were submitted to active laser. The 6-min walk test (6MWT) was performed, and blood lactate was determined at rest (before LLLT application and 6MWT), immediately after the exercise test (time 0) and recovery (3, 6, and 30 min). A multi-diode LLLT cluster probe (DMC, So Carlos, Brazil) was used. Both groups increased 6MWT distance after active or placebo LLLT application compared to baseline values (p = 0.03 and p = 0.01, respectively)

however, no difference was observed during intergroup comparison. The active LLLT group showed a significant reduction in the perceived exertion Borg (PEB) scale compared to the placebo LLLT group (p = 0.006). In addition, the group that received active LLLT showed no statistically significant difference for the blood lactate level through the times analyzed. The placebo LLLT group demonstrated a significant increase in blood lactate between the rest and recovery phase (p < 0.05). Acute effects of LLLT irradiation on skeletal musculature were not able to improve the functional capacity of hospitalized patients with HF, although it may favorably modulate blood lactate metabolism and reduce perceived muscle fatigue.
Keywords Heart failure
Low-level laser therapy (LLLT)
Functional capacity
6-min walk test
Lactate
xmlui.dri2xhtml.METS-1.0.item-coverage London
Language English
Sponsor FAPESP
CNPQ
Grant number FAPESP: 2013/15507-3
FAPESP: 2013/22224-8
Date 2016
Published in Lasers In Medical Science. London, v. 31, n. 6, p. 1203-1209, 2016.
ISSN 0268-8921 (Sherpa/Romeo, impact factor)
Publisher Springer London Ltd
Extent 1203-1209
Origin http://dx.doi.org/10.1007/s10103-016-1965-0
Access rights Closed access
Type Article
Web of Science ID WOS:000379849500020
URI https://repositorio.unifesp.br/handle/11600/57502

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