Table 2 Peak values of the main variables determined during the incremental exercise test.

From: Acute respiratory muscle unloading improves time-to-exhaustion during moderate- and heavy-intensity cycling in obese adolescent males

 

OB

CTRL

Exercise duration, s

972 ± 182

1224 ± 241*

Work rate, watt

164 ± 32

206 ± 40*

HR, beats/min

170.6 ± 9.0

189.1 ± 4.5***

RPER (0–10)

6.3 ± 3.1

8.3 ± 2.1

RPEL (0–10)

8.0 ± 2.1

9.2 ± 1.0

SpO2, %

97.4 ± 1.6

96.3 ± 2.1

\({\dot{\text{V}}}\) O2, L/min

2.48 ± 0.48

3.03 ± 0.63*

\({\dot{\text{V}}}\) O2, mL/min/kg

21.2 ± 4.0

44.6 ± 9.9***

\({\dot{\text{V}}}\) CO2, L/min

2.62 ± 0.58

3.29 ± 0.66*

R

1.04 ± 0.05

1.09 ± 0.04

\({\dot{\text{V}}}_{{\text{E}}}\), L/min

86.4 ± 25.4

115.5 ± 24.2*

PETO2, mmHg

94.6 ± 3.9

116.4 ± 5.1***

PETCO2, mmHg

34.2 ± 3.4

33.4 ± 5.7

fR, breaths/min

37.9 ± 5.7

49.2 ± 10.6**

VT, L

2.3 ± 0.5

2.4 ± 0.4

  1. OB obese adolescents, CTRL control subjects, HR heart rate, RPEL rate of perceived exertion for leg effort, RPER rate of perceived exertion for respiratory discomfort, SpO2 arterial blood O2 saturation by pulse oximetry; \(\dot{V}\) O2 **O2 uptake, \(\dot{V}\) CO2 CO2 output, R respiratory gas-exchange ratio, \(\dot{V}_{E}\) pulmonary ventilation, PETCO2, CO2 end-tidal pressure; PETO2, O2 end tidal pressure, fR respiratory frequency, VT tidal volume; Values are expressed as mean ± standard deviation.
  2. ***P < 0.001; **P < 0.01; *P < 0.05.
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