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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">In the context of the COVID-19 pandemic and due to the authorization of sports practice in Catalonia&#44; that has generated various health problems among the athletes&#46; We present some initial results that allow us to give guidelines that balance the risk of contagion and that of hypercapnic hypoxia generated using protective masks&#46; Speculation and uncertainties are the order of the day<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">1</span></a>&#59; clear doubts&#44; motivates the present study&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Objectives&#58; &#40;a&#41; Provide urgent information on the safety of the use of masks for the prevention of COVID-19&#44; by athletes&#46; &#40;b&#41; Assess the impact of the use of masks on inhaled air during an aerobic exercise of the order of 1&#46;25<span class="elsevierStyleHsp" style=""></span>W&#47;kg &#40;6&#8211;8 METS&#41;&#44; the oxygen deficiency generated by its use&#44; as well as the possible toxicity associated with the increase CO<span class="elsevierStyleInf">2</span> breathed&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Material and methods</span><p id="par0015" class="elsevierStylePara elsevierViewall">Eight subjects were assessed at baseline with and without a mask&#44; and immediately after a 21-flex test performed following the Ruffier protocol with a mask&#44; with determination of the accumulated height as a function of time&#46; Of 21 push-ups<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">2</span></a> in a public park&#46; With determination of SaO<span class="elsevierStyleInf">2</span>Hb&#44; heart rate &#40;HR&#41;&#44; watts &#40;W&#41;&#44; O<span class="elsevierStyleInf">2</span> and CO<span class="elsevierStyleInf">2</span>&#46; The power achieved has been calculated in kilograms per second &#40;Kp-m&#47;s&#41; and has been converted into W and W&#47;kg&#59; and the interval has also been estimated in METS&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">The subjects studied had this baseline characteristics&#58; mean age&#58; 48&#46;9 &#40;19&#8211;66&#41; years old&#59; height&#58; 168 &#40;159&#8211;176&#41; cm&#59; BMI&#58; 22&#46;1 &#40;19&#46;1&#8211;28&#46;9&#41;&#46; Medical history&#58; HT &#40;1 case&#41;&#44; psychiatric &#40;1 case&#41;&#44; COVID-19 positive &#40;1 case discharged&#41;&#44; smoking &#40;1 case&#41;&#44; emphysema &#40;1 case&#41; and 4 without medical history&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Pulse Oximeter model FS20C TEMPI-TEC&#46; MultiRae gas analyzer from Rae Systems&#174; &#40;portable chemical detector&#41; with analysis of oxygen&#44; carbon dioxide and carbon monoxide&#46; It was strictly protocolized to avoid any risk of contagion&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Statistical analysis was performed with IBM SPSS&#174; version 19 software&#44; the T test for paired samples and the ANOVA of repeated means depending on the type of analysis used&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Results</span><p id="par0035" class="elsevierStylePara elsevierViewall">The 8 subjects &#40;2 women&#44; 6 men&#41; were calculated to have performed the test<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">2</span></a> with a performance of 82&#46;81<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>27&#46;3<span class="elsevierStyleHsp" style=""></span>W &#40;1&#46;23<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;37<span class="elsevierStyleHsp" style=""></span>W&#47;kg&#41; &#40;i&#46;e&#46; between 6 and 8 METS&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall">In two cases&#44; the CO<span class="elsevierStyleInf">2</span> level of 2&#37; &#40;20<span class="elsevierStyleHsp" style=""></span>000 parts per million or ppm&#41; has been reached&#46; This represents the threshold of toxicity for many subjects&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Subjects&#44; when wearing a mask&#44; at rest showed a minimal decrease in capillary hemoglobin saturation O<span class="elsevierStyleInf">2</span> &#40;97&#46;6<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;5&#37;&#41;&#46; At the end of the test they showed a decrease of 5&#46;5 points &#40;saturation O<span class="elsevierStyleInf">2</span> 92&#46;1<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#46;12&#37;&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#8804;<span class="elsevierStyleHsp" style=""></span>0&#46;02&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Regarding the heart rate during the test&#44; have been&#58; 75&#46;7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>17&#46;1<span class="elsevierStyleHsp" style=""></span>bpm at rest vs&#46; 112&#46;8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#46;1<span class="elsevierStyleHsp" style=""></span>bpm&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#8804;<span class="elsevierStyleHsp" style=""></span>0&#46;001<span class="elsevierStyleHsp" style=""></span>at the end of the test at 45&#8243;&#46; The heart rate recovery at one minute post effort was&#58; 81<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>17&#46;5<span class="elsevierStyleHsp" style=""></span>bpm&#59; and at 3<span class="elsevierStyleHsp" style=""></span>min 78&#46;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>23&#46;6<span class="elsevierStyleHsp" style=""></span>bpm &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;56&#41;&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Discussion</span><p id="par0055" class="elsevierStylePara elsevierViewall">The results of our study show that there is a significant decrease in O<span class="elsevierStyleInf">2</span> and increase in CO<span class="elsevierStyleInf">2</span> when performing an aerobic exercise with a mask&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">To date&#44; we do not know of other studies that assess the use of protective masks related to sport&#44; with which we can contrast our results&#44; but we do have different points of view with supporters and detractors of their use in the context of the pandemic from COVID-19&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">3</span></a> There are other studies on the effect of contamination and hypercapnic hypoxia and its possible metabolic implications in moderate hypercapnia&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">4&#44;5</span></a> In the case of hypoxia and severe hypercapnia&#44; there are affectations at the neuro-vegetative level&#44;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">6</span></a> with diverse symptoms typical of hypercapnia&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">7</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">We consider it of general interest to be able to communicate some initial results that confirm the hypoxic and hypercapnic impact due to the protection with masks on the intensity levels of aerobic exercise&#46; We provide real first figures on the range of the rarefied air generated by the masks&#46; We visualize a cut zone in the figure of 2&#37; of hypercapnia&#59; this topic should be object of analysis and consensus among the specialists&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Knowing the size of the O<span class="elsevierStyleInf">2</span> &#40;0&#46;15<span class="elsevierStyleHsp" style=""></span>nm&#41; and CO<span class="elsevierStyleInf">2</span> &#40;0&#46;33<span class="elsevierStyleHsp" style=""></span>nm&#41; molecules and the size of the SARS-CoV-2 that is between 50 and 200<span class="elsevierStyleHsp" style=""></span>nm&#44; it can be deduced that&#44; seeing the considerable filtering impact of masks&#44; their effect will be effective in preventing&#47;limiting the penetration of SARS-CoV-2 by air&#46; The effects of oxygen deficiency can be assessed in isolation&#44; when compared with the Saturation O<span class="elsevierStyleInf">2</span> data reported for acute exposure at different altitudes above sea level&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">8</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">In relation to the limitations of our study&#44; we can mention &#40;a&#41; a small number of subjects in the sample&#59; &#40;b&#41; study that has been carried out outside the physiology laboratory environment &#40;closed at this stage of the pandemic&#41;&#59; &#40;c&#41; it is limited to investigate the intensity only in the range of 6&#8211;8 METS&#59; &#40;d&#41; also does not provide data on the different types of masks and different prototypes for the protection of the nose&#44; mouth and respiratory tract&#46; And finally&#44; the analysis of the gaseous content of the mask-subject interface is simply that&#44; and therefore it is not an ergo-spirometric analysis&#44; but the study of the gaseous composition that the subject will inhale&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Conclusions</span><p id="par0080" class="elsevierStylePara elsevierViewall">The use of masks in a resting situation decreases the availability of oxygen by 14&#37; on average and increases aspirated CO<span class="elsevierStyleInf">2</span> levels by 30 times&#46; The use of masks during a short exercise with an intensity around 6&#8211;8 METS&#44; decreases O<span class="elsevierStyleInf">2</span> by 3&#46;7&#37; and increases the CO<span class="elsevierStyleInf">2</span> concentration by 20&#37;&#46; In some model of mask during exercise&#44; 20<span class="elsevierStyleHsp" style=""></span>000<span class="elsevierStyleHsp" style=""></span>ppm of CO<span class="elsevierStyleInf">2</span> &#40;2&#37;&#41; is reached and it can be uncomfortable and symptomatic for some of the subjects&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Due to the mandatory use of a mask&#44; and the authorization to do outdoor sports in Catalonia&#44; we aimed to assess the physiological impact of the hypercapnia hypoxia generated by the masks during aerobic sports practice&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Eight subjects &#40;2 women&#44; 6 men&#41; were assessed at baseline with and without a mask&#44; and immediately after a 21-flex test performed following the Ruffier protocol with a mask&#46; Measures of HR &#40;heart rate&#41;&#44; concentration of O<span class="elsevierStyleInf">2</span> and CO<span class="elsevierStyleInf">2</span> inside the mask and SatO<span class="elsevierStyleInf">2</span> were assessed&#46; The test was carried out in ambient air in squares in the city of Barcelona&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">A decrease in O<span class="elsevierStyleInf">2</span> was recorded&#44; and when comparing the&#44; baseline 20&#46;9&#37;&#44; baseline mask 18&#46;3&#37;&#44; post-exercise 17&#46;8&#37; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46; An increase in CO<span class="elsevierStyleInf">2</span> in the three preconditions &#40;464&#44; 14162&#44; 17<span class="elsevierStyleHsp" style=""></span>000<span class="elsevierStyleHsp" style=""></span>ppm&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46; Basal saturation O<span class="elsevierStyleInf">2</span> was 97&#46;6<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;5&#37; and post exercise 92&#46;1<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#46;12&#37; &#40;<span class="elsevierStyleItalic">p</span> 0&#46;02&#41;&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">The use of masks in athletes causes hypoxic and hypercapnic breathing as evidenced by increased effort during exercise&#46; The use of masks during a short exercise with an intensity around 6&#8211;8 METS&#44; decreases O<span class="elsevierStyleInf">2</span> by 3&#46;7&#37; and increases the CO<span class="elsevierStyleInf">2</span> concentration by 20&#37;&#46;</p></span>"
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                  \t\t\t\t">17<span class="elsevierStyleHsp" style=""></span>000<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2684&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">97&#46;6<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
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          "en" => "<p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">shows the changes in O<span class="elsevierStyleInf">2</span> and CO<span class="elsevierStyleInf">2</span> in the 3 conditions&#44; basal with and without mask&#44; and post exercise with mask&#46;</p>"
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      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0015"
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                  "contribucion" => array:1 [
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                      "titulo" => "Exercising Outdoors With a Face Mask"
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                            0 => "I&#46; de Yzaguirre y Maura"
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                            2 => "M&#46; Dom&#232;nech Feira-Carot"
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Journal Information
Vol. 55. Issue 208.
Pages 143-145 (October - December 2020)
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Vol. 55. Issue 208.
Pages 143-145 (October - December 2020)
Special article
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COVID-19 and mask in sports
Visits
3518
Fernando Pifarréa, Diego Dulanto Zabalab, Gonzalo Graziolic, Ignasi de Yzaguirre i Mauraa,
Corresponding author
a Unitat de Medicina i Esport, Generalitat of Catalunya, Barcelona, Spain
b Basurto University Hospital, Bilbao, Spain
c Àptima Center Clínic, Terrassa, Spain
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Table 1. shows the changes in O2 and CO2 in the 3 conditions, basal with and without mask, and post exercise with mask.
Abstract
Introduction

Due to the mandatory use of a mask, and the authorization to do outdoor sports in Catalonia, we aimed to assess the physiological impact of the hypercapnia hypoxia generated by the masks during aerobic sports practice.

Methods

Eight subjects (2 women, 6 men) were assessed at baseline with and without a mask, and immediately after a 21-flex test performed following the Ruffier protocol with a mask. Measures of HR (heart rate), concentration of O2 and CO2 inside the mask and SatO2 were assessed. The test was carried out in ambient air in squares in the city of Barcelona.

Results

A decrease in O2 was recorded, and when comparing the, baseline 20.9%, baseline mask 18.3%, post-exercise 17.8% (p<0.001). An increase in CO2 in the three preconditions (464, 14162, 17000ppm; p<0.001). Basal saturation O2 was 97.6±1.5% and post exercise 92.1±4.12% (p 0.02).

Conclusions

The use of masks in athletes causes hypoxic and hypercapnic breathing as evidenced by increased effort during exercise. The use of masks during a short exercise with an intensity around 6–8 METS, decreases O2 by 3.7% and increases the CO2 concentration by 20%.

Keywords:
COVID-19
SARS-CoV-2
Hypoxia
Hypercapnia
Sport
Masks
Full Text
Introduction

In the context of the COVID-19 pandemic and due to the authorization of sports practice in Catalonia, that has generated various health problems among the athletes. We present some initial results that allow us to give guidelines that balance the risk of contagion and that of hypercapnic hypoxia generated using protective masks. Speculation and uncertainties are the order of the day1; clear doubts, motivates the present study.

Objectives: (a) Provide urgent information on the safety of the use of masks for the prevention of COVID-19, by athletes. (b) Assess the impact of the use of masks on inhaled air during an aerobic exercise of the order of 1.25W/kg (6–8 METS), the oxygen deficiency generated by its use, as well as the possible toxicity associated with the increase CO2 breathed.

Material and methods

Eight subjects were assessed at baseline with and without a mask, and immediately after a 21-flex test performed following the Ruffier protocol with a mask, with determination of the accumulated height as a function of time. Of 21 push-ups2 in a public park. With determination of SaO2Hb, heart rate (HR), watts (W), O2 and CO2. The power achieved has been calculated in kilograms per second (Kp-m/s) and has been converted into W and W/kg; and the interval has also been estimated in METS.

The subjects studied had this baseline characteristics: mean age: 48.9 (19–66) years old; height: 168 (159–176) cm; BMI: 22.1 (19.1–28.9). Medical history: HT (1 case), psychiatric (1 case), COVID-19 positive (1 case discharged), smoking (1 case), emphysema (1 case) and 4 without medical history.

Pulse Oximeter model FS20C TEMPI-TEC. MultiRae gas analyzer from Rae Systems® (portable chemical detector) with analysis of oxygen, carbon dioxide and carbon monoxide. It was strictly protocolized to avoid any risk of contagion.

Statistical analysis was performed with IBM SPSS® version 19 software, the T test for paired samples and the ANOVA of repeated means depending on the type of analysis used.

Results

The 8 subjects (2 women, 6 men) were calculated to have performed the test2 with a performance of 82.81±27.3W (1.23±0.37W/kg) (i.e. between 6 and 8 METS) (Table 1).

Table 1.

shows the changes in O2 and CO2 in the 3 conditions, basal with and without mask, and post exercise with mask.

  Basal without mask  Basal with mask  Mask post-exercise  p 
O2,%  20.9  18.3±0.24  17.8±0.43  <0.001 
CO2, ppm  464±117  14162±2100  17000±2684  <0.001 
Saturation O2,%  97.6±1.5  –  92.1±4.12  0.02 
Heart rate, bpm  75.7±17.1  –  112.8±4.1  <0.001 

In two cases, the CO2 level of 2% (20000 parts per million or ppm) has been reached. This represents the threshold of toxicity for many subjects.

Subjects, when wearing a mask, at rest showed a minimal decrease in capillary hemoglobin saturation O2 (97.6±1.5%). At the end of the test they showed a decrease of 5.5 points (saturation O2 92.1±4.12%; p0.02).

Regarding the heart rate during the test, have been: 75.7±17.1bpm at rest vs. 112.8±4.1bpm; p0.001at the end of the test at 45″. The heart rate recovery at one minute post effort was: 81±17.5bpm; and at 3min 78.9±23.6bpm (p=0.56).

Discussion

The results of our study show that there is a significant decrease in O2 and increase in CO2 when performing an aerobic exercise with a mask.

To date, we do not know of other studies that assess the use of protective masks related to sport, with which we can contrast our results, but we do have different points of view with supporters and detractors of their use in the context of the pandemic from COVID-19.3 There are other studies on the effect of contamination and hypercapnic hypoxia and its possible metabolic implications in moderate hypercapnia.4,5 In the case of hypoxia and severe hypercapnia, there are affectations at the neuro-vegetative level,6 with diverse symptoms typical of hypercapnia.7

We consider it of general interest to be able to communicate some initial results that confirm the hypoxic and hypercapnic impact due to the protection with masks on the intensity levels of aerobic exercise. We provide real first figures on the range of the rarefied air generated by the masks. We visualize a cut zone in the figure of 2% of hypercapnia; this topic should be object of analysis and consensus among the specialists.

Knowing the size of the O2 (0.15nm) and CO2 (0.33nm) molecules and the size of the SARS-CoV-2 that is between 50 and 200nm, it can be deduced that, seeing the considerable filtering impact of masks, their effect will be effective in preventing/limiting the penetration of SARS-CoV-2 by air. The effects of oxygen deficiency can be assessed in isolation, when compared with the Saturation O2 data reported for acute exposure at different altitudes above sea level.8

In relation to the limitations of our study, we can mention (a) a small number of subjects in the sample; (b) study that has been carried out outside the physiology laboratory environment (closed at this stage of the pandemic); (c) it is limited to investigate the intensity only in the range of 6–8 METS; (d) also does not provide data on the different types of masks and different prototypes for the protection of the nose, mouth and respiratory tract. And finally, the analysis of the gaseous content of the mask-subject interface is simply that, and therefore it is not an ergo-spirometric analysis, but the study of the gaseous composition that the subject will inhale.

Conclusions

The use of masks in a resting situation decreases the availability of oxygen by 14% on average and increases aspirated CO2 levels by 30 times. The use of masks during a short exercise with an intensity around 6–8 METS, decreases O2 by 3.7% and increases the CO2 concentration by 20%. In some model of mask during exercise, 20000ppm of CO2 (2%) is reached and it can be uncomfortable and symptomatic for some of the subjects.

Acknowledgment

Volunteers subjected to stress test in a level 0 confinement situation in the Barcelona Epicenter, COVID-19.

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