TY - JOUR AU - BALCI, Gorkem Aybars PY - 2018/11/19 Y2 - 2024/03/29 TI - Effects of high intensity continuous and intermittent training strategies used for endurance development on cardio-vascular responses JF - Journal of Science and Cycling JA - J Sci Cycling VL - 7 IS - 2 SE - DO - UR - https://jsc-journal.com/index.php/JSC/article/view/410 SP - 28 AB - <p>Purpose of the present study was to examine the potential effects of five high intensity training (HIT) models on central and peripheral components of VO<sub>2max</sub>. We analysed O<sub>2</sub> consumption (VO<sub>2</sub>), cardiac output (Q), stroke volume (SV), heart rate (HR) and arteriovenous O<sub>2</sub> difference (a-vO<sub>2diff</sub>) in different regimes of HIT during loading and recovery periods. Eight well-trained male competitive cyclists take part in the study (age: 22.1±3.1 years; body mass: 66.2±8.5 kg; height: 175.4±5.2 cm; body fat: 7.2%±1.1%; O<sub>2max</sub>: 64±5.61 mL∙min<sup>-1</sup>∙kg<sup>-1</sup>). Following familiarization sessions, VO<sub>2max</sub> was determined, and then, maximal SV, HR, Q and a-vO<sub>2diff</sub> (SV<sub>max</sub>), (HR<sub>max</sub>), (Q<sub>max</sub>), (a-vO<sub>2diff_max</sub>) were evaluated individually using exercise intensities corresponding to 40 to 110% of VO<sub>2max</sub> separately, by nitrous-oxide re-breathing (N<sub>2</sub>O<sub>RB</sub>) method. Thereafter, training models were performed as; HIT<sub>1</sub>:<sub> </sub>16 repetitions with power at ~110% of VO<sub>2max</sub> for 45-sec (16×45-sec, p@~110%VO<sub>2max</sub>) with 1:1 work and recovery (w/r) ratio; HIT<sub>2</sub>: 4×3-min at p@~93%VO<sub>2max</sub> with 1:1 w/r ratio; HIT<sub>3</sub>: alternating the power between VO<sub>2max</sub> (1-min) and anaerobic threshold (4-min) × 5 repetitions; HIT<sub>4</sub>: 25-min constant-load, HIT<sub>5</sub>: 6×30-sec at 7,5% body weight with 1:7 w/r ratio. All participants reached exhaustion at all tested HIT models. After the repeated-measures analyses, possible significant differences were investigated by post-hoc LSD/Wilcoxon. T<sub>spent</sub> above 95% of VO<sub>2max</sub> was higher in HIT<sub>2</sub> session than other exercise modalities (p&lt;0.05). However, amongst all protocols T<sub>spent</sub> above 90% of VO<sub>2max</sub> were not statistically different amongst exercise modalities, except HIT<sub>5</sub> (p&gt;0.05); T<sub>spent</sub> at VO<sub>2max</sub> was lowest in HIT<sub>5</sub> (p&lt;0.05). T<sub>spent</sub> at Q<sub>max</sub> was higher in HIT<sub>2</sub> and HIT<sub>3 </sub>sessions than HIT<sub>1</sub>, HIT<sub>2</sub> and HIT<sub>5</sub> (p&lt;0.05). T<sub>spent</sub> at SV<sub>max</sub> was higher in HIT<sub>3</sub> and HIT<sub>4</sub> modalities than HIT<sub>1 </sub>and HIT<sub>2</sub>. T<sub>spent</sub> at 95% of HR<sub>max</sub> was higher in HIT<sub>2</sub> session than other exercise modalities (p&lt;0.05). T<sub>spent</sub> at a-vO<sub>2diff_max</sub> was higher in HIT<sub>1</sub> and HIT<sub>2</sub> than HIT<sub>3</sub>, HIT<sub>4</sub> and HIT<sub>5</sub> (p&lt;0.05). These results show that different exercise modalities reaching similar VO<sub>2max</sub> levels may be effective in the development of central or peripheral components associated with VO<sub>2max</sub>. It may be said that continuous HIT modalities seems to have a higher potential to improve central part of VO<sub>2max</sub>, while intermittent HIT modalities seems better for peripheral one.</p> ER -