Physiological Responses to Interval Training Sessions at Velocities Associated With &amp;Vdot;o2max

Rozenek, Ralph; Funato, Kazuo; Kubo, Junjiro; Hoshikawa, Masako; Matsuo, Akifumi

doi:10.1519/r-19325.1

Cited by 28 publications

(38 citation statements)

References 14 publications

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“…In intermittent protocols, as the work-to-rest ratio decreased, the VO 2 decreased as well, while the La − increased. In contrast, previous studies that investigated the effect of work-to-rest ratio manipulation on physiological responses [11], [24]–[26] did not reveal an opposite trend in VO 2 and La − responses (high VO 2 – low La − and viceversa). In fact, Ballor and Volovsek [24] compared three INT protocols with the same work and rest durations to those adopted in our study, with the difference that both the absolute work intensity and the total duration of exercise were fixed.…”

Section: Discussioncontrasting

confidence: 88%

“…On an “isoeffort” and “isotime” basis, the higher total work found in CON compared to INT indicates that in order to ensure similar between-protocol overall effort, the total work should be different in the two exercise modes. In addition, when manipulating the work-to-rest ratio with this approach we obtained a complex physiological picture that differs from the responses reported in literature with traditional methods of comparison [11], [24]–[26]. Within this physiological framework, similar between-protocol responses of respiratory frequency, as well as a nearly perfect relationship with RPE in all the experimental protocols indicate that, during INT exercise, respiratory frequency reflects physiological strain better than the physiological parameters traditionally used.…”

Section: Discussionmentioning

confidence: 70%

“…On an “isoeffort” and “isotime” basis, the work-to-rest ratio manipulation affects physiological responses in a different way from what previous studies with traditional methods of comparison report [11], [24]–[26]. Despite a complex physiological framework, ventilatory parameters showed similar between-protocol responses.…”

Section: Discussionmentioning

confidence: 80%

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Comparing Continuous and Intermittent Exercise: An “Isoeffort” and “Isotime” Approach

et al. 2014

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The present study proposes an alternative way of comparing performance and acute physiological responses to continuous exercise with those of intermittent exercise, ensuring similar between-protocol overall effort (isoeffort) and the same total duration of exercise (isotime). This approach was expected to overcome some drawbacks of traditional methods of comparison. Fourteen competitive cyclists (20±3 yrs) performed a preliminary incremental test and four experimental 30-min self-paced protocols, i.e. one continuous and three passive-recovery intermittent exercise protocols with different work-to-rest ratios (2 = 40∶20s, 1 = 30∶30s and 0.5 = 20∶40s). A “maximal session effort” prescription was adopted for this experimental design. As expected, a robust perceived exertion template was observed irrespective of exercise protocol. Similar between-protocol pacing strategies further support the use of the proposed approach in competitive cyclists. Total work, oxygen uptake and heart rate mean values were significantly higher (P<0.05) in the continuous compared to intermittent protocols, while lactate values were lower. Manipulating the work-to-rest ratio in intermittent exercise, total work, oxygen uptake and heart rate mean values decreased with the decrease in the work-to-rest ratio, while lactate values increased. Despite this complex physiological picture, all protocols showed similar ventilatory responses and a nearly perfect relationship between respiratory frequency and perceived exertion. In conclusion, our data indicate that overall effort and total duration of exercise are two critical parameters that should both be controlled when comparing continuous with intermittent exercise. On an isoeffort and isotime basis, the work-to-rest ratio manipulation affects physiological responses in a different way from what has been reported in literature with traditional methods of comparison. Finally, our data suggest that during intermittent exercise respiratory frequency reflects physiological strain better than oxygen uptake, heart rate and blood lactate.

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Section: Discussioncontrasting

confidence: 88%

Section: Discussionmentioning

confidence: 70%

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Comparing Continuous and Intermittent Exercise: An “Isoeffort” and “Isotime” Approach

et al. 2014

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“…The SI protocol used by Helgerud et al 15 was designed as 15-second work periods alternated by 15-seconds active recovery periods and it has been observed that time above 90% of V O 2max is higher during a SI session when the duration of the work periods is 30 seconds, as in the present study. 6,30 Furthermore, it has been indicated that a work:recovery ratio of 1:1 induces less time spent above 90% of V O 2max than the 2:1 ratio applied in the present study. 6 Based on these rationales, it might be suggested that the training stimulus, defined as time above 90% of V O 2max , was larger in the present SI protocol and thus larger adaptations might be expected.…”

Section: Discussionmentioning

confidence: 50%

“…4 Different work:recovery ratios have been used, but 2:1 or 1:1 ratios are frequently used. 5,6 Both short intervals [7][8][9] and long intervals [10][11][12] have been demonstrated to improve endurance performance or performance-related parameters in already endurance-trained participants. The few studies that have compared the training effects of shorter and longer intervals in endurance-trained participants usually report similar performance improvements.…”

Section: Introductionmentioning

confidence: 99%

Superior performance improvements in elite cyclists following short‐interval vs effort‐matched long‐interval training

Rønnestad

Hansen

Nygaard

et al. 2020

Scandinavian Med Sci Sports

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The purpose of this study was to compare the effects of 3 weeks with three weekly sessions (ie, nine sessions in total) of short intervals (SI; n = 9; 3 series with 13 × 30‐second work intervals interspersed with 15‐second recovery and 3‐minutes recovery between series) against effort‐matched (rate of perceived effort based) long intervals (LI; n = 9; 4 series of 5‐minute work intervals with 2.5‐minutes recovery between series) on performance parameters in elite cyclists (trueV˙normalO2max 73 ± 4 mL min−1 kg−1). There were no differences between groups in total volume and intensity distribution of training during the intervention period. SI achieved a larger (P < .05) relative improvement in peak aerobic power output than LI (3.7 ± 4.3% vs −0.3 ± 2.8%, respectively), fractional utilization of trueV˙normalO2max at 4 mmol L−1 [La−] (3.0 ± 5.8 percent points vs −3.5 ± 2.7 percent points, respectively), and larger relative increase in power output at 4 mmol L−1 [La−] (2.0 ± 6.7% vs −2.8 ± 3.4, respectively), while there was no group difference in change of trueV˙normalO2max. Improvements in performance measured as mean power output during 20‐minute cycling test were greater (P < .01) in SI compared with LI (4.7 ± 4.4% vs −1.4 ± 2.2%, respectively). Mean effect size of the improvement in the above variables revealed a small to large effect of SI training vs LI training. The data thus demonstrate that the present SI protocol induces superior training adaptations compared with the present LI protocol in elite cyclists.

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High-intensity decreasing interval training (HIDIT) increases time above 90% $$\dot{V}$$O2peak

2020

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Purpose Training near $$\dot{V}$$ V ˙ O2max is considered to be the most effective way to enhance $$\dot{V}$$ V ˙ O2max. High-intensity interval training (HIIT) is a well-known time-efficient training method for improving cardiorespiratory and metabolic function and $$\dot{V}$$ V ˙ O2max. While long HIIT bouts allow $$\dot{V}$$ V ˙ O2max to be achieved quickly, short HIIT bouts improve time to exhaustion (Tlim). The aim of this study was to evaluate the time spent above 90% $$\dot{V}$$ V ˙ O2peak (T > 90% $$\dot{V}$$ V ˙ O2peak) during three different HIIT protocols. Methods Twelve cyclists performed three HIIT sessions. Each protocol had the same work and recovery power and ratio of work·recovery−1. The protocols consisted of long-interval HIIT (LIHIIT, 3 min work—2 min recovery), short-interval HIIT (SIHIIT, 30 s work—20 s recovery), and high-intensity decreasing interval training (HIDIT, work from 3 min to 30 s and recovery from 2 min to 20 s). T > 90% $$\dot{V}$$ V ˙ O2peak, Tlim, blood lactate [La], and rate of perceived exertion (RPE) were measured at Tlim. Results T > 90% $$\dot{V}$$ V ˙ O2peak was greater in HIDIT (312 ± 207 s) than in SIHIIT (182 ± 225 s; P = 0.036) or LIHIIT (179 ± 145 s; P = 0.027). Tlim was not significantly different (P > 0.05) between HIDIT (798 ± 185 s), SIHIIT (714 ± 265 s), and LIHIIT (664 ± 282). At Tlim, no differences in [La] and RPE were found between protocols (P > 0.05). Conclusion HIDIT showed the highest T > 90% $$\dot{V}$$ V ˙ O2peak, suggesting that it may be a good strategy to increase time close to $$\dot{V}$$ V ˙ O2peak, despite similar Tlim, [La], and RPE at Tlim.

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Physiological Responses to Interval Training Sessions at Velocities Associated With &Vdot;o2max

Cited by 28 publications

References 14 publications

Comparing Continuous and Intermittent Exercise: An “Isoeffort” and “Isotime” Approach

Comparing Continuous and Intermittent Exercise: An “Isoeffort” and “Isotime” Approach

Superior performance improvements in elite cyclists following short‐interval vs effort‐matched long‐interval training

High-intensity decreasing interval training (HIDIT) increases time above 90% $$\dot{V}$$O2peak

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