Nathaniel D. Rhoades1, Jacob J. May1, Blaine S. Lints1, Harry P. Cintineo2, Alexa J. Chandler1, Bridget A. McFadden3, Gianna F. Mastrofini1, Shawn M. Arent, FACSM1. 1University of South Carolina, Columbia, SC. 2Lindenwood University, Saint Charles, MO. 3Queens College, New York, NY.

BACKGROUND: Resistance training (RT) is widely understood to influence oxygen consumption kinetics during aerobic exercise. While measurement of cardiovascular 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: 41 collegiate Reserve Officer Training Corps (ROTC) cadets (n= 11 female; n= 30 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 differences in VO2max, VO2VT2, and 2-mile run time pre- and post-intervention. 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: No significant differences were identified pre- to post-testing for VO2max (p > 0.05) or VO2VT2 (p > 0.05). 2-mile run time was significantly different in pre- vs. post-testing (17.64 ± 3.3 vs. 16.82 ± 2.9, p < 0.01). Average HR during the 2-mile run was significantly higher compared to HRVT2 in pre- to post-testing (181.1 ± 9.7 vs. 163 ± 13.2, p < 0.01) (180.3 ± 7.6 vs. 160.8 ± 11.2, p < 0.01). No correlations were identified between changes in 2-mile run times and VO2max (r = -0.18, p = 0.26) or VO2VT2 (r = -0.03, p = 0.86). CONCLUSIONS: Our findings suggest VO2max and VO2VT2 do not have significant predictive value for changes in 2-mile run time following a 6-week RT intervention. Pre- and post-intervention average HR during the 2-mile run was significantly higher than HRVT2, indicating the run was performed at a high intensity. Future research should investigate the value of various physiological metrics in predicting changes in high intensity run performance, particularly after non-aerobic training interventions.

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