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High-intensity functional training (HIFT) elicits higher peak heart rate, blood lactate concentrations, and ratings of perceived exertion compared to high-intensity continuous training (HICT), despite similar overall physiological and psychobiological responses. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

November 1, 2023Open Access

Comparison of physiological and psychobiological acute responses between high intensity functional training and high intensity continuous training

DSDouglas de Assis Teles SantosUniversidade do Estado da Bahia NMNaiane Silva MoraisUniversidade Federal de Goiás RVRicardo Borges VianaWestern University

Structured PICO

Does high intensity functional training elicit different physiological and psychobiological responses compared to high intensity continuous training in trained healthy men?

Population

21 trained and healthy men, aged ≥18 years, with over six months experience in high intensity functional training (HIFT). Excluded: contraindications for physical activity, use of anxiolytic drugs, antidepressants, anabolic-androgenic steroids, or stimulants, and having bone, muscle, or joint injury.

Intervention

20-minute session of High Intensity Functional Training (HIFT) consisting of the WOD 'Cindy' AMRAP (5 pull-ups, 10 push-ups, and 15 air squats).

Comparator

20-minute session of High Intensity Continuous Training (HICT) consisting of continuous running on a treadmill at an intensity equivalent to the participant's mean heart rate obtained during the HIFT session.

Outcome

Physiological and psychobiological responses including heart rate, blood lactate concentration, state anxiety, rating of perceived exertion (RPE), perceived discomfort (RPE-D), and affective valence measured during and up to 24 hours after the sessions.surrogate

High intensity functional training elicits similar psychobiological responses to continuous training but results in higher peak heart rates, blood lactate, and perceived exertion, likely due to greater anaerobic glycolytic metabolism.

Abstract

Little is known about the physiological and psychobiological responses that occur during and after high intensity functional training (HIFT). We compared physiological and psychobiological responses during and after a HIFT session with a high intensity continuous training (HICT) session. Twenty-one trained and healthy men were submitted to 20-min session of HIFT and HICT on separate days. The heart rate, blood lactate concentration Lac, levels of state anxiety, rates of perceived exertion (RPE) and perceived discomfort (RPE-D), and affective valence were measured. Exercise intensity of the HICT was adjusted to the mean heart rate obtained in the HIFT session. The highest heart rate in the training sessions was significantly higher in HIFT (mean ± standard deviation SD: 187 ± 9 bpm) than in HICT (mean ± SD: 178 ± 8 bpm, p < 0.001). The Lac was significantly higher immediately after the HIFT (median interquartile range (IQR): 6.8 4.4 mmol/L) than the HICT (median IQR: 3.2 1.9, p = 0.021) and 10 min after (median IQR: HIFT = 6.8 4.9 mmol/L, HICT = 2.9 2.4 mmol/L, p = 0.003). The RPE was also significantly higher in the HIFT (median IQR: HIFT = 20 2, HICT = 15 5, p = 0.009). The physiological and psychobiological responses compared between HIFT and HICT sessions are similar, except for the higher heart rate obtained during the sessions, Lac and RPE. Probably, the results found for the higher heart rate obtained during the sessions, Lac and RPE may be explained by the higher participation of the anaerobic glycolytic metabolism during the HIFT session.

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