Endurance training induces adaptations that enlarge the isocapnic buffering phase independent of age (p<0.01), while aging is associated with a reduction of this phase.
Cross-Sectional (n=32)
How do aging and training status affect the ventilatory response and isocapnic buffering phase during incremental cycling exercise?
Endurance training induces physiological adaptations that enlarge the isocapnic buffering phase independent of age, although aging itself is associated with a reduction in this phase.
p-value: p=<0.01
The aim of this study was to examine the effect of aging and training status on ventilatory response during incremental cycling exercise. Eight young (24 ± 5 years) and 8 older (64 ± 3 years) competitive cyclists together with 8 young (27 ± 4 years) and 8 older (63 ± 2 years) untrained individuals underwent a continuous incremental cycling test to exhaustion to determine ventilatory threshold (VT), respiratory compensation point (RCP), and maximal oxygen uptake (VO₂max). In addition, the isocapnic buffering (IB) phase was calculated together with the hypocapnic hyperventilation. Ventilatory threshold occurred at similar relative exercise intensities in all groups, whereas RCP was recorded at higher intensities in young and older cyclists compared to the untrained subjects. The IB phase, reported as the difference between VT and RCP and expressed either in absolute (ml·min⁻¹·kg⁻¹ VO₂) or in relative terms, was greater (p < 0.01) in both young and older trained cyclists than in untrained subjects, who were also characterized by a lower exercise capacity. Isocapnic buffering was particularly small in the older untrained volunteers. Although young untrained and older trained subjects had a similar level of VO₂max, older athletes exhibited a larger IB. In addition, a higher absolute but similar relative IB was observed in young vs. older cyclists, despite a higher VO₂max in the former. In conclusion, the present study shows that aging is associated with a reduction of the IB phase recorded during an incremental exercise test. Moreover, endurance training induces adaptations that result in an enlargement of the IB phase independent of age. This information can be used for the characterization and monitoring of the physiological adaptations induced by endurance training.
Lenti et al. (Fri,) reported a cross-sectional. Endurance training and aging vs. Untrained status and young age was evaluated on Isocapnic buffering (IB) phase (p=<0.01). Endurance training induces adaptations that enlarge the isocapnic buffering phase independent of age (p<0.01), while aging is associated with a reduction of this phase.