60 ± 0.55 3.87 ± 0.47* 818.3 ± 127.2 869.3 ± 130.0* 2.14 ± 0.53 2.49 ± 0.57* Pl (n = 17) 3.65 ± 0.59 4.00 ± 0.59* 837.7 ± 130.1 899.4 ± 127.9* 2.30 ± 0.51 2.54 ± 0.48 Con (n = 10) 3.67 ± 0.71 3.54 ± 0.71 802.8 ± 148.9 781.9

± 151.2 2.08 ± 0.70 1.99 ± 0.48 *Indicates a significant (p ≤ 0.01) change over time within treatment groups. There was a significant two-way interaction (time × treatment, p < 0.001) for VO2PEAKTTE; however, a post hoc Bonferroni analysis indicated no significant differences between groups at post measurement. A main effect for time (p < 0.001) occurred, and separate Bonferroni-adjusted (p < 0.017) dependent-samples t-tests indicated a significant Selleckchem Palbociclib change over time in the Cr (p < 0.001) and Pl (p < 0.001) groups. Ventilatory Threshold (VT) A significant two-way interaction (time × treatment, p = 0.040) occurred for VT (l·min-1). A post hoc Bonferroni analysis indicated no difference between Cr and Pl (Table 1). Separate Bonferroni-adjusted (p < 0.017) dependent-samples t-test indicated a change over time for Cr (p = 0.001), but not for Pl (p = 0.040) (Figure 2). Figure 2 Effect of Creatine and HIIT on VT. Percent change in VT over time

for each group. Total Work Done (TWD) Table 2 summarizes the mean changes in TWD at 110% of the selleck kinase inhibitor VO2PEAK maximum workload within the three treatment groups. There was no interaction and no main effect Etomoxir cost for time for either group.

Table 2 Mean ± SD of total work done (TWD) at 110% of VO2PEAK maximum workload at baseline and following four weeks of treatment   TWD (kJ)   Baseline Post Cr (n = 16) 42.3 ± 8.0 40.5 ± 9.4 Pl (n = 17) 47.5 ± 14.1 43.3 ± 10.0 Con (n = 10) 37.7 ± 9.1 39.0 ± 11.6 Discussion High-intensity interval training DNA ligase has been shown to be an effective method for improving endurance performance [7, 12, 23–26]. The results of the present study are in agreement with many studies demonstrating an increase in VO2PEAK after HIIT [12, 27–29]. In addition, time to exhaustion during the graded exercise test was also improved. However, few studies have examined the concurrent effects of HIIT with Cr supplementation on endurance performance. The current study demonstrated no additional improvements in VO2PEAK when combining Cr supplementation and HIIT. However, when measuring VT, improvements were only demonstrated in the Cr group. Interestingly, in contrast to previous reports of significant increases in TWD with Cr supplementation or HIIT alone, no change in TWD was observed [5, 28, 30–33]. Endurance performance is commonly assessed using a measure of aerobic capacity, VO2PEAK. HIIT has been reported to be effective in improving VO2PEAK 5-15% [12, 27–29, 34–40]. In the current study, a 9% increase in VO2PEAK was observed.