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RELATIONSHIP BETWEEN CHANGE IN VO2VT2 AND CHANGE IN 2-MILE RUN TIME

B Lints

Abstract

Blaine Lints. University of South Carolina, Columbia, SC.

BACKGROUND: Resistance training (RT) is widely understood to influence oxygen consumption kinetics during aerobic exercise. While measurement of cardiovascular (CV) fitness has focused heavily on maximal oxygen consumption (VO2max), the utility of assessing the second ventilatory threshold (VO2VT2) has gained increasing attention as a relevant metric. The purpose of this study was to identify associations between changes in VO2max and VO2VT2 with changes in 2-mile run times following a 6-week RT intervention. METHODS: 17 collegiate Reserve Officer Training Corps (ROTC) cadets (n=9 female; n=8 male) completed a 6-week RT intervention consisting of 4 sessions per week. VO2max, VO2VT2, and 2-mile run times were assessed pre- and post-intervention. Heart rate (HR) was measured via chest strap during all testing (Polar Electro Inc., Woodbury, NY, USA). Paired sample t-tests were used to evaluate changes in VO2max, VO2VT2, and 2-mile run time. To determine relative intensity of the 2-mile run, paired t-tests were used to compare average HR during the 2-mile run and HRVT2. Pearson-product moment correlations were used to assess relationships between individual changes in VO2max and VO2VT2 with changes in 2-mile run times. An alpha level of 0.05 was used to determine statistical significance. RESULTS: On average, no significant changes were observed from pre- to post-testing for VO2max, VO2VT2, or 2-mile run time (P > 0.05). HR during the 2-mile run was significantly higher than HRVT2 at both pre- (94.4% vs. 85.2%HRmax, P < 0.01) and post-testing (94.3% vs. 85.6%HRmax, P < 0.01). No correlation was observed between changes in VO2max and 2-mile run times (r = 0.05, P = 0.8), but changes in VO2VT2 were inversely correlated with changes in 2-mile run times (r = -0.55, P = 0.02). CONCLUSIONS: These findings suggest greater utility of changes in VO2VT2, compared to VO2max, in predicting changes in 2-mile run times. Average HR during the 2-mile run was significantly higher than HRVT2, indicating the run was performed at a high intensity. Training strategies aimed at improving VT2 may translate to improved high-intensity aerobic performance during efforts requiring large anaerobic contributions regardless of influence on VO2max. Furthermore, VT2 may be a more malleable physiological parameter than VO2max and has potential to facilitate greater aerobic performance improvements.

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