Effects of 2 weeks of low-intensity cycle training with different pedaling rates on the work rate at lactate threshold.
Effects of 2 weeks of low-intensity cycle training with different pedaling rates on the work rate at lactate threshold.
复制标题
2周不同踩踏速率的低强度自行车训练对乳酸阈值工作率的影响。
DOI：
10.1007/s00421-014-3081-9
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Kiyonaga A.
中科院分区：
文献类型：
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作者：
Hirano M;Shindo M;Mishima S;Morimura K;Higuchi Y;Yamada Y;Higaki Y;Kiyonaga A.
目的本研究检验了 (1) 不同蹬踏速率的单次运动对生理反应、踏板力和肌肉氧合的影响，以及 (2) 不同蹬踏速率训练 2 周对乳酸阈值 (WorkLT) 工作速率 (WorkLT) 的影响。方法 16 名健康男性参与了这项研究。进行增量运动测试，包括以 50 rpm 的速度踩踏自行车测力计，以评估最大耗氧量和 WorkLT。参与者在 WorkLTintensity 中以三种不同的踩踏速率（35、50 和 75 rpm）进行恒定负荷、次最大运动测试。测量运动过程中的耗氧量（O2）、血压、心率（HR）、血乳酸和踏板力，并通过近红外光谱监测股外侧肌氧合血红蛋白/肌红蛋白浓度（OxyHb/Mb）。然后，参与者被随机分配到 WorkLT 的低频或高频踩踏频率（LFTr，35 rpm 或 HFTr，75 rpm）组进行自行车运动训练。每个 60 分钟的训练课程每周进行五次。结果尽管保持相同的工作速率，但 35 rpm 转速下的 O2 和 HR 明显低于 75 rpm 转速下的氧气和心率。相反，35 rpm 时的综合踏板力明显高于 75 rpm。 35 rpm 时的外周血氧血红蛋白 (OxyHb/Mb) 显着低于 75 rpm。训练 2 周后，LFTr 组中按体重归一化的 WorkLT 显着增加，但 HFTr 组则没有。结论 骑行运动期间的踩踏频率以及相应的踏板力和外周氧合会影响 LT 训练对 WorkLT 的影响。
PurposeThis study examined (1) the effects of a single bout of exercise at different pedaling rates on physiological responses, pedal force, and muscle oxygenation, and (2) the effects of 2 weeks of training with different pedaling rates on work rate at lactate threshold (WorkLT).MethodsSixteen healthy men participated in the study. An incremental exercise test involving pedaling a cycling ergometer at 50 rpm was conducted to assess maximal oxygen consumption and WorkLT. The participants performed constant workload, submaximal exercise tests at WorkLTintensity with three different pedaling rates (35, 50, and 75 rpm). Oxygen consumption (O2), blood pressure, heart rate (HR), blood lactate, and pedal force were measured and oxy-hemoglobin/myoglobin concentration (OxyHb/Mb) at vastus lateralis was monitored by near-infrared spectroscopy during exercise. The participants were then randomly assigned to cycling exercise training at WorkLTin either the low or high frequency pedaling rate (LFTr, 35 rpm or HFTr, 75 rpm) group. Each 60-min training session was performed five times/week.ResultsDespite maintaining the same work rate,O2and HR were significantly lower at 35 than 75 rpm. Conversely, integrated pedal force was significantly higher at 35 than 75 rpm. Peripheral OxyHb/Mb was significantly lower at 35 than 75 rpm. After 2 weeks of training, WorkLTnormalized to body mass significantly increased in the LFTr, but not the HFTr group.ConclusionsPedaling rate and the corresponding pedal force and peripheral oxygenation during cycling exercise influence the effect of training at LT on WorkLT.