Impact of weekly frequency of high-intensity interval training on cardiorespiratory, metabolic, and performance measures in recreational runners - An exploratory study.

Although these changes did not reach statistical significance, such trends could be linked to increased stroke volume and vagal tone, further supporting the role of HIIT in enhancing submaximal cardiovascular responses.

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Participants training twice or thrice weekly showed a trend toward reduced submaximal heart rate (HR submax ), which aligns with previous findings suggesting that intensified endurance training may decrease submaximal heart rate at a given running velocity, reflecting improved cardiovascular efficiency (Andrew et al., 1966 ; Clausen et al., 1970 ; Ekblom et al., 1968 ).

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