Abstract
Background: The aim of the study was to compare acute physiological, biochemical, and perceptual responses during sprint interval exercise (SIE) with breathing through a device increasing added respiratory dead space volume (ARDSV) and without the device. Methods: The study involved 11 healthy, physically active men (mean maximal oxygen uptake: 52.6 ± 8.2 mL∙kg1∙min−1). During four visits to a laboratory with a minimum interval of 72 h, they participated in (1) an incremental test on a cycle ergometer; (2) a familiarization session; (3) and (4) cross-over SIE sessions. SIE consisted of 6 × 10-s all-out bouts with 4-min active recovery. During one of the sessions the participants breathed through a 1200-mL ARDSv (SIEARDS). Results: The work performed was significantly higher by 4.4% during SIEARDS, with no differences in the fatigue index. The mean respiratory ventilation was significantly higher by 13.2%, and the mean oxygen uptake was higher by 31.3% during SIEARDS. Respiratory muscle strength did not change after the two SIE sessions. In SIEARDS, the mean pH turned out significantly lower (7.26 vs. 7.29), and the mean HCO3– concentration was higher by 7.6%. Average La− and rating of perceived exertion (RPE) did not differ between the sessions. Conclusions: Using ARDSV during SIE provokes respiratory acidosis, causes stronger acute physiological responses, and does not increase RPE.
Highlights
Interval training can be described as intermittent high-intensity exercises divided by periods of incomplete recovery [1]
The aim of this research was to determine the physiological and biochemical responses and rating of perceived exertion (RPE) during a single sprint interval exercise (SIE) session consisting of 6 × 10-s bouts with an active 4-min rest interval with 1200-mL added respiratory dead space volume (ARDSV) breathing, as well as to compare the responses with those obtained during a session performed under standard conditions without breathing impediments
We examined the effect of ARDSV breathing during a single SIE session and compared it with the results obtained during a session without ARDSV
Summary
Interval training can be described as intermittent high-intensity exercises divided by periods of incomplete recovery (e.g., lower-intensity work) [1]. With reference to the generally recommended moderate-intensity continuous training, SIT is considered an effective and time-efficient strategy for improving general physical capacity and cardiorespiratory capacity (e.g., maximal oxygen uptake (VO2 max)), as well as lowering the risk of cardiometabolic diseases in the healthy population [4]. A study by Hazell et al [5] based on a 2-week training program revealed that 10-s efforts (with 4-min recovery) efficiently improved cardiorespiratory capacity as compared with the “classic” SIT protocol, involving 4–6 × 30-s efforts with 4-min rest. The aim of the study was to compare acute physiological, biochemical, and perceptual responses during sprint interval exercise (SIE) with breathing through a device increasing added respiratory dead space volume (ARDSV ) and without the device. Results: The work performed was significantly higher by 4.4% during
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