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Title: Acute effects of low-level laser therapy irradiation on blood lactate and muscle fatigue perception in hospitalized patients with heart failure-a pilot study
Authors: Bublitz, Caroline [UNIFESP]
Renno, Ana Claudia Muniz [UNIFESP]
Ramos, Rodrigo Santin [UNIFESP]
Assis, Livia [UNIFESP]
Sellera, Carlos Alberto Cyrillo
Trimer, Renata
Borghi-Silva, Audrey
Arena, Ross
Guizilini, Solange [UNIFESP]
Keywords: Heart failure
Low-level laser therapy (LLLT)
Functional capacity
6-min walk test
Issue Date: 2016
Publisher: Springer London Ltd
Citation: Lasers In Medical Science. London, v. 31, n. 6, p. 1203-1209, 2016.
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, São 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.
ISSN: 0268-8921
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