Experienced competitive runners may increase VO 2max and decrease %BF after a marathon-specific training cycle. VDOT was significantly associated with alloVO 2 (r = -0.779, p = 0.039) but not with VO 2max (r = 0.071, p = 0.867). The alpha level for significance was set at 0.05. Paired t-tests were used to compare pre- and post-training values. Body composition (%BF) was determined using hydrostatic weighing. Eight runners (age 34☒ years marathon <3:00 males, <3:30 females five females) completed treadmill marathon-intensity-effort (MIE) and VO 2max tests at 10 and 1-2 weeks pre-marathon.

This study’s purpose was to determine whether VO 2max and measures of RE change with marathon training, and to evaluate the relationship between these variables and VDOT. The VDOT score, incorporating VO 2max and RE, enables comparison of race performances under different temperature conditions. Little is known about physiological changes that occur in competitive runners over a marathon training cycle. A valid evaluation of RE may occur through allometric scaling of body mass (alloVO 2 ml kg -0.66 min -1), energy cost (EC kcal kg -1 km -1), or percent of VO 2max (%VO 2max). Maximal aerobic capacity (VO 2max) and running economy (RE) are markers of running performance.

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