■最大摄氧量(VO2max)是耐力性能的重要决定因素。热适应/适应(HA/HAz)引起耐久性能的改善。热暴露减少后,间歇性热训练(IHT)可以缓解HA/HAz适应衰减;然而,相应的VO2max响应未知。
■HAz/HA后保持VO2max;IHT减轻HAz/HA后有氧功率的下降。
■介入研究。
■3级。
■总共27名男性耐力运动员(平均值±SD;年龄,36±12岁;体重,73.03±8.97kg;高度,178.81±6.39cm)在5个时间点完成了VO2max测试;基线,后HAZ,后HA,以及IHT的第4周和第8周(IHT4,IHT8)。基线测试后,参与者完成HAZ,之前是5天的HA涉及运动,以在高温下诱导高温60分钟(环境温度,39.13±1.37°C;相对湿度,51.08±8.42%)。参与者被随机分配到3个IHT组中的1个:每周一次,每周两次,或者没有IHT。VO2max的差异,VO2max(vVO2)时的速度,和最大心率(HRmax)在所有5个时间点使用重复测量方差分析和Bonferroni校正后进行分析。
■基线之间未观察到明显的VO2max或vVO2差异,后HAZ,或后HA(分别为P=0.36和P=0.09)。在HA后,VO2max或vVO2没有发现显著的组或时间效应,IHT4和IHT8(分别为P=0.67和P=0.21)。在基线和后HA测试之间观察到显著的HRmax差异(P<0.01)。HA后无显著组或时间HRmax差异,IHT4和IHT8(P=0.59)。
■在HA/HAz和IHT后,耐力跑步者的VO2max并未降低,这可能是由于参与者的类似有氧训练状态和高有氧健身水平。
■HAz/HA和IHT保持耐力跑步者的有氧力量,HAZ/HA降低了HRmax。
UNASSIGNED: Maximal oxygen uptake (VO2max) is an important determinant of endurance performance. Heat acclimation/acclimatization (HA/HAz) elicits improvements in endurance performance. Upon heat exposure reduction, intermittent heat training (IHT) may alleviate HA/HAz adaptation
decay; however, corresponding VO2max responses are unknown.
UNASSIGNED: VO2max is maintained after HAz/HA; IHT mitigates decrements in aerobic power after HAz/HA.
UNASSIGNED: Interventional study.
UNASSIGNED: Level 3.
UNASSIGNED: A total of 27 male endurance runners (mean ± SD; age, 36 ± 12 years; body mass, 73.03 ± 8.97 kg; height, 178.81 ± 6.39 cm) completed VO2max testing at 5 timepoints; baseline, post-HAz, post-HA, and weeks 4 and 8 of IHT (IHT4, IHT8). After baseline testing, participants completed HAz, preceded by 5 days of HA involving exercise to induce hyperthermia for 60 minutes in the heat (ambient temperature, 39.13 ± 1.37°C; relative humidity, 51.08 ± 8.42%). Participants were assigned randomly to 1 of 3 IHT groups: once-weekly, twice-weekly, or no IHT. Differences in VO2max, velocity at VO2max (vVO2), and maximal heart rate (HRmax) at all 5 timepoints were analyzed using repeated-measure analyses of variance with Bonferroni corrections post hoc.
UNASSIGNED: No significant VO2max or vVO2 differences were observed between baseline, post-HAz, or post-HA (P = 0.36 and P = 0.09, respectively). No significant group or time effects were identified for VO2max or vVO2 at post-HA, IHT4, and IHT8 (P = 0.67 and P = 0.21, respectively). Significant HRmax differences were observed between baseline and post-HA tests (P < 0.01). No significant group or time HRmax differences shown for post-HA, IHT4, and IHT8 (P = 0.59).
UNASSIGNED: VO2max was not reduced among endurance runners after HA/HAz and IHT potentially due to participants\' similar aerobic training status and high aerobic fitness levels.
UNASSIGNED: HAz/HA and IHT maintain aerobic power in endurance runners, with HAz/HA procuring reductions in HRmax.