Six Hit Treadmill Sessions Improve Lipid Oxidation and Ventilatory Threshold Intensities

Abstract

Introduction: High-intensity interval training (HIT) has been used as an alternative to cardiorespiratory training performed continuously at submaximal intensity and over long periods. Objectives: Propose a treadmill HIT protocol and verify the influence of six HIT sessions with this protocol on ventilatory anaerobic thresholds (VATs) and substrate oxidation pattern during submaximal continuous exercise (SCE). Methods: Fifteen sporadically active subjects underwent maximal progressive testing before and after six HIT treadmill running sessions to determine peak oxygen uptake (VO2peak), peak velocity (Vpeak), and VATs followed by SCE to determine lipid (LIPox) and carbohydrate (CHOox) oxidation rates. The HIT sessions consisted of eight sets of 60s at 100%Vpeak, interspersed with 75s of passive recovery between sets and a 48h interval between sessions. Results: Our results showed increases in VAT intensities of 4.4% for VAT1 and 8.8% for VAT2, a decrease of 12.8% in CHOox and an increase of 23.7% for LIPox; accordingly, the relative energy derived from LIPox was 20.3% higher after the training period. Vpeak was ~15 km/h, producing intensities corresponding to ~84%VO2peak and ~91%FCpeak over the training period. Conclusion: The proposed protocol produced adaptations and intensities which are similar to those described in the literature, but unlike others, it can be applied in sporadically active individuals. Level of Evidence II; Comparative prospective study.

Six HIT Sessions Improve Cardiorespiratory Fitness and Metabolic Flexibility in Insulin Resistant and Insulin Sensitive Adolescents with Obesity

“…However, in the present study, we observed that the IS group, even in a short period of intervention, showed an improvement in VO2peak (increased by 10.99%), data that corroborate those presented by Gibala et al [ 42 ], who after a short HIT program, observed an improvement in cardiorespiratory fitness associated, according to them, with peripheral adaptations, such as increased mitochondrial biogenesis and improved muscle buffering capacity. Marquezi et al [ 13 ] verified that after six sessions of HIT on a treadmill ergometer there is a stimulus for mitochondrial biogenesis due to the increase in PGC-1α protein content, an adaptation similar to that observed after a single HIT session [ 43 ].…”

“…However, lack of time, difficulty accessing specific facilities, and low motivation are some of the barriers to low adherence, i.e., failure to engage in regular exercise [ 10 ]. In this context, high-intensity interval training (HIT) is available, characterized by short bouts of vigorous activity interspersed with rest or low-intensity exercise [ 11 ], with the advantage of improving cardiorespiratory fitness and energy substrate oxidation in adults in six sessions [ 12 , 13 ]. Moreover, HIT when compared to traditional endurance training or moderate-intensity continuous exercise (MICT), invariably related to ventilatory anaerobic thresholds (VATs), can produce similar and even superior changes in physiological and physical performance and health-related outcomes, but with a sustainably reduced duration and volume of exercise [ 14 ].…”

Effect of Menstrual Cycle Phase on Fuel Oxidation Post HIT in Women Reproductive Age: A Pilot Study

“…Vpeak corresponded to the highest speed reached during the tests. The VATs were determined according to Marquezi et al [ 21 ].…”

“…The treadmill HIT protocol consisted of two initial warm-up periods of 2 min each at 25% and 50% V peak , followed by eight sets of 60 s at 100% V peak for 75 s of passive recovery, plus two cool-down periods of 2 min each, at 50% and 25% of V peak . Ventilatory parameters and heart rate (HR) were measured in each training session to determine the relative intensity of effort [ 21 ]. The training sessions were held between 12 p.m. and 7 p.m. to meet the availability of the participants.…”

Training Mode Comparisons on Cardiorespiratory, Body Composition and Metabolic Profile Adaptations in Reproductive Age Women: A Systemic Review and Meta-Analysis

“…In addition, other research groups used total supramaximal intervals (SIT) to describe >100% VO 2 max in studies with healthy individuals [4,5] and high intensity interval training (HIIT) for low volume training, with ~30 s short intervals and with a lower 95% intensity maximum oxygen consumption (VO 2 max), or for training between 80-100% of maximum heart rate [5][6][7][8]. However, despite the widespread use of the term "HIIT" in the media, several research groups have been using the abbreviation of the term "high-intensity interval training" (with a hyphen) as "HIT" [9][10][11][12], the same terminology used in this study.…”