. 2021 Nov 20;42(1):43–52. doi: 10.1111/cpf.12734

Table 4.

Values of characteristic parameters obtained at different epochs during exercise performed 25% below the ventilatory threshold with and without a surgical mask

	Condition	3–6 min	7–10 min	Δ 10‐7
VO₂ (mL kg⁻¹ min⁻¹)	Mask	30.1 ± 3.8	30.3 ± 3.5	−0.04 ± 1.5
VO₂ (mL kg⁻¹ min⁻¹)	No mask	31.6 ± 3.9	32.0 ± 3.8	0.10 ± 1.2
Heart rate (bpm)	Mask	142.5 ± 14.1	148.6 ± 14.5 ^a	3.3 ± 3.0 ^b
Heart rate (bpm)	No mask	141.7 ± 13.9	147.8 ± 13.9 ^a	3.8 ± 2.9 ^b
Ve (L min⁻¹)	Mask	45.7 ± 9.1	47.2 ± 8.5 ^a	0.8 ± 3.1
Ve (L min⁻¹)	No mask	50.4 ± 8.4	51.9 ± 9.0 ^a	0.7 ± 2.7
RER	Mask	0.93 ± 0.05	0.93 ± 0.04	−0.03 ± 0.02
RER	No mask	0.94 ± 0.05	0.93 ± 0.05	−0.01 ± 0.01

Values are mean ± SD.

Abbreviations: VO₂, oxygen uptake; Ve, minute ventilation; RER, respiratory exchange ratio; Δ 7–10, change between the seventh and tenth minute of exercise.

^{^a}

Significant differences between time points (p < 0.05).

^{^b}

Δ value significantly different from 0 (p < 0.05).