Figure 3. Correlation between recovery time for performance (t_{n_P}) and HF power (t_{n_HF}) and between peak time for performance (t_{g_P}) and HF power (t_{g_HF}).

Significant correlation was demonstrated first, between the time to recover to the initial level of performance (t_{n_P}) and HF power (left panel) and second, between the time to peak performance and HF power (t_{g_HF}).