Abstract
Background: This study aimed to report, through a systematic review of the literature, the baseline and final reference values obtained by near-infrared spectroscopy (NIRS) of muscle oxygen saturation (SmO2) during resistance training in healthy adults. Methods: Original research studies were searched from four databases (Scopus, PubMed, WOS, and SportDiscus). Subsequently, three independent reviewers screened the titles and abstracts, followed by full-text reviews to assess the studies’ eligibility. Results: Four studies met the inclusion criteria, data were extracted and methodological quality was assessed using the Downs and Black scale. Muscle oxygen saturation (% SmO2) during reported muscle strength exercises showed a decreasing trend after a muscle strength protocol; that is, before the protocol (range = 68.07–77.9%) and after (range = 9.50–46.09%). Conclusions: The trend of the SmO2 variables is to decrease after a muscle strength protocol. Studies are lacking that allow expanding the use of these devices during this type of training.
Highlights
Today, near-infrared spectroscopy (NIRS) has positioned itself in the field of physical activity and health as a valid, reliable and inexpensive wireless instrument [1,2,3,4,5,6,7]
Near-infrared spectroscopy (NIRS) has positioned itself in the field of physical activity and health as a valid, reliable and inexpensive wireless instrument [1,2,3,4,5,6,7]. This technology is capable of evaluating, in real time, the balance between muscle oxygen supply and its demand during physical exercise [8]. These devices illuminate the skeletal muscle with infrared light and detect the light reflected through it as a consequence of the amount of light absorbed by the tissue, recognizing variables such as oxyhemoglobin (O2 Hb) and deoxyhemoglobin (HHb), as well as other derivatives such as total hemoglobin and muscle oxygen saturation expressed in percentage (%) (SmO2 = [O2 Hb]/[tHb] × 100), among others [9]
There is a small number of portable NIRS that are used in the sports market; among the most used, we find Portamon (Artinis Medical System, Einsteinweg, The Netherlands), Moxy Monitor
Summary
Near-infrared spectroscopy (NIRS) has positioned itself in the field of physical activity and health as a valid, reliable and inexpensive wireless instrument [1,2,3,4,5,6,7]. This technology is capable of evaluating, in real time, the balance between muscle oxygen supply and its demand during physical exercise [8].
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