Oxygen uptake during the last bouts of exercise incorporated into high-intensity intermittent cross-exercise exceeds the V˙ O2max of the same exercise mode

IF 2.3 Q2 SPORT SCIENCES Sports Medicine and Health Science Pub Date : 2024-03-01 DOI:10.1016/j.smhs.2024.01.002
Yuzhong Xu, Xin Liu, Katsunori Tsuji, Takafumi Hamaoka, Izumi Tabata
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Abstract

Oxygen uptake (V˙ O2) was measured during a non-exhaustive high-intensity intermittent cross-exercise (HIICE) protocol consisting of four alternating bouts of 20 ​s running (R) and three bouts of bicycle exercise (BE) at ∼160% and ∼170% maximal oxygen uptake (V˙ O2max), respectively, with 10 ​s between-bout rests (sequence R-BE-R-BE-R-BE-R). The V˙ O2 during the last BE ([52.2 ​± ​5.0] mL·kg−1·min−1) was significantly higher than the V˙ O2max of the BE ([48.0 ​± ​5.4] mL·kg−1·min−1, n ​= ​30) and similar to that of running. For clarifying the underlying mechanisms, a corresponding HIICE-protocol with BE and arm cranking ergometer exercise (AC) was used (sequence AC-AC-BE-AC-BE-AC-AC-BE). In some experiments, thigh blood flow was occluded by a cuff around the upper thigh. Without occlusion, the V˙ O2 during the AC ([39.2 ​± ​7.1] mL·kg−1·min−1 [6th bout]) was significantly higher than the V˙ O2max of AC ([30.2 ​± ​4.4] mL·kg−1·min−1, n ​= ​7). With occlusion, the corresponding V˙ O2 ([29.8 ​± ​3.9] mL·kg−1·min−1) was reduced to that of the V˙ O2max of AC and significantly less than the V˙ O2 without occlusion. These findings suggest that during the last bouts of HIICE may exceed the of the specific exercise, probably because it is a summation of the V˙ O2 for the ongoing exercise plus excess post-oxygen consumption (EPOC) produced by the previous exercise with a higher V˙ O2max.

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在高强度间歇性交叉运动的最后一轮运动中,摄氧量超过了相同运动模式下的В˙ O2max。
在非消耗性高强度间歇交叉运动(HIICE)方案中测量了摄氧量(V˙ O2),该方案包括四次交替进行的 20 秒跑步(R)和三次自行车运动(BE),最大摄氧量(V˙ O2max)分别为∼160%和∼170%,两次运动之间休息 10 秒(序列 R-BE-R-BE-R-BE-R)。最后一次BE时的V˙ O2([52.2 ± 5.0] mL-kg-1-min-1)明显高于BE时的V˙ O2max([48.0 ± 5.4] mL-kg-1-min-1,n = 30),与跑步时相似。为阐明其基本机制,采用了相应的 HIICE 方案,即 BE 和曲臂测力计运动(AC)(序列为 AC-AC-BE-AC-BE-AC-AC-BE)。在一些实验中,大腿血流被大腿上部的袖带阻断。在没有闭塞的情况下,交流时的 V ˙ O2([39.2 ± 7.1] mL-kg-1-min-1 [第 6 次])明显高于交流的 V ˙ O2max([30.2 ± 4.4] mL-kg-1-min-1,n = 7)。闭塞时,相应的 V˙ O2([29.8 ± 3.9] mL-kg-1-min-1)降低到 AC 的 V˙ O2max,明显低于未闭塞时的 V˙ O2。这些研究结果表明,在 HIICE 的最后一次运动中,V˙ O2max 可能会超过特定运动的 V˙O2max,这可能是因为它是正在进行的运动的 V˙ O2max 加上之前运动产生的过量氧消耗(EPOC)的总和,而之前运动的 V˙ O2max 较高。
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来源期刊
Sports Medicine and Health Science
Sports Medicine and Health Science Health Professions-Physical Therapy, Sports Therapy and Rehabilitation
CiteScore
5.50
自引率
0.00%
发文量
36
审稿时长
55 days
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