Table 2.

Ventilatory parameters measured in awake C57BL/6 × 129 mice using whole body plethysmography

Age	Respiratory rate (min−1)	Tidal volume (ml/g)	Minute ventilation (ml/g/min−1)	Duty cycle (%)
24 (mo)	216 ± 43	0.009 ± 0.002	1.8 ± 0.6	35 ± 9
27 (mo)	167 ± 32	0.010 ± 0.001	1.6 ± 0.3	31 ± 5
30 (mo)	202 ± 68	0.010 ± 0.003	1.8 ± 0.4	30 ± 5

Data analyzed by one‐way ANOVA at 24, 27, and 30 months of age (mo; n = 10 for each age group). No age effect was evident on respiratory rate (p = .10), normalized tidal volume (p = .33), normalized minute ventilation (p = .52), or duty cycle (p = .20). Data shown as mean ± SD.