The relationships between age and running performance variables in master runners

Purpose: Peak aerobic capacity (V˙ O _2peak) declines with age, but running economy (RE) may not. We evaluated VO_2peak and RE in master runners and determined whether age is associated with these measures. Methods: In a cross-sectional study, runners completed two running tests within 4 weeks of a goal race of 10–26.2 miles. Subjects ran for 5 min at 88% of predicted maximum heart rate, approximating a marathon-intensity effort (MIE), then performed a V˙ O _2peak test. Running economy in the MIE was measured using oxygen cost with body mass scaled allometrically (allo V˙ O ₂); energy cost (EC), determined using caloric equivalents; and percent of V˙ O _2peak (%V˙ O _2peak). Pearson’s correlations were used to determine relationships between age and running performance variables. Results: Runners (n = 31, 13 females; mean age 54.9 ± 8.4 years) had a mean VO_2peak of 52.5 ± 7.9 ml O₂ kg⁻¹ min⁻¹. Age was significantly correlated with V˙ O _2peak (r = − 0.580, p = 0.001) and allo V˙ O ₂ (r = − 0.454, p = 0.034). Age was related to EC in females (r = 0.649, p = 0.042) and MIE V˙ O ₂ in males (r = − 0.600, p = 0.039). Conclusions: In this population, age was negatively associated with V˙ O _2peak and allo V˙ O ₂. Females showed a positive relationship between age and EC, while males had a negative correlation between age and MIE V˙ O ₂. Aerobic capacity declines with age, but there may be sex differences in age-related alterations to submaximal running.