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Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men

SpringerPlus (2013) 2(1) 1-10
DOI: 10.1186/2193-1801-2-532
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Abstract

Purpose: The objectives of this study were to examine the effect of 4-week moderate- and high-intensity interval training (MIIT and HIIT) on fat oxidation and the responses of blood lactate (BLa) and rating of perceived exertion (RPE). Methods: Ten overweight/obese men (age = 29 ±3.7 years, BMI = 30.7 ±3.4 kg/m2) participated in a cross-over study of 4-week MIIT and HIIT training. The MIIT training sessions consisted of 5-min cycling stages at mechanical workloads 20% above and 20% below 45%VO2peak The HIIT sessions consisted of intervals of 30-s work at 90% VO2peak and 30-s rest. Pre- and post-training assessments included VO2max using a graded exercise test (GXT) and fat oxidation using a 45-min constant-load test at 45%VO2max. BLa and RPE were also measured during the constantload exercise test. Results: There were no significant changes in body composition with either intervention. There were significant increases in fat oxidation after MIIT and HIIT (p ≤ 0.01), with no effect of intensity. BLa during the constant-load exercise test significantly decreased after MIIT and HIIT (p ≤ 0.01), and the difference between MIIT and HIIT was not significant (p = 0.09). RPE significantly decreased after HIIT greater than MIIT (p ≤ 0.05). Conclusion: Interval training can increase fat oxidation with no effect of exercise intensity, but BLa and RPE decreased after HIIT to greater extent than MIIT. © 2013 Alkahtani et al.

Figures

  • Table 1 Body composition and VO2peak at weeks 0 and 4 in MIIT and HIIT
  • Figure 1 Rate of fat oxidation during the constant-load exercise test at week 0 (solid line) and week 4 (dotted line) in MIIT (square) and HIIT (circle); data represented as mean ± SD. The effect of time on fat oxidation was significant (p ≤ 0.001). MIIT: moderate-intensity interval training; HIIT: high-intensity interval training.
  • Figure 2 Concentration of blood lactate during the constant-load exercise test at week 0 (solid line) and week 4 (dotted line) in MIIT (square) and HIIT (circle); data represented as mean ± SEM. There was a significant effect of time (p ≤ 0.05). The interaction between intensity and time was not significant (P = 0.09). MIIT: moderate-intensity interval training; HIIT: high-intensity interval training.
  • Figure 3 Rate of perceived exertion (RPE) during the constant-load exercise test at week 0 (solid line) and week 4 (dotted line) in MIIT (square) and HIIT (circle); data represented as mean ± SEM. There was a significant effect of time (p ≤ 0.001). The interaction between time and intensity was significant (p ≤ 0.05). MIIT: moderate-intensity interval training; HIIT: high-intensity interval training.
  • Figure 4 The concentration of blood lactate (BLa) during 4-week training of MIIT (a) and HIIT (b); data collected in the first exercise session of every week; data represented as mean ± SEM. Note: workload at 30 mins of MIIT was lower than workload at 5 and 15 mins of MIIT. There was a significant effect of training period (weeks) (p ≤ 0.001). MIIT-1-4: moderate-intensity interval training at weeks 1, 2, 3 and 4; HIIT-1-4: high-intensity interval training at week 1, 2, 3 and 4.
  • Figure 5 The rate of perceived exertion (RPE) during 4-week training of MIIT (a) and HIIT (b); data collected in the first exercise session of every week; data represented as mean ± SEM. Note: workload at 30 mins of MIIT was lower than workload at 5 and 15 mins of MIIT. There was a significant effect of training period (weeks) (p≤ 0.001), and an interaction between intensity and training period (weeks) on RPE (p ≤ 0.05). MIIT-1-4: moderate-intensity interval training at weeks 1, 2, 3 and 4; HIIT-1-4: high-intensity interval training at week 1, 2, 3 and 4.

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APA

Alkahtani, S. A., King, N. A., Hills, A. P., & Byrne, N. M. (2013). Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men. SpringerPlus, 2(1), 1–10. https://doi.org/10.1186/2193-1801-2-532

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