在怀孕期间,心输出量(Q$\\dot{Q}$)和血容量(BV)增加,以支持胎儿生长。在慢性耐力运动训练和有益表现过程中,也会增加Q♪$\\dot{Q}$和BV。我们调查了产后早期进行的sprint间歇训练(SIT)是否能维持升高的怀孕和BV和BV。参与者,一个有竞争力的曲棍球运动员和前自行车手,在妊娠2周(基线)和产后前访问了我们的实验室,干预中和干预后(PPpre,PPmid和PPpost)。分娩并不复杂,她觉得准备在产后5周开始SIT计划。用惰性气体再呼吸测量运动峰值Q$\\dot{Q}$(Q$\\dot{Q}$峰值);VO2峰值${{\\dot{V}}_{{{{{{\\mathrm{O}}}_{\\\mathrm{2}}}}{\\\mathrm{峰值}}}}}$用血18个SIT会话从4到8个冲刺进行到130%的V²O2峰值${{\\dot{V}}_{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{峰值}}}}$峰值功率输出。在所有产后时间点,Q﹤$\\dot{Q}$峰值从基线增加(基线16.2与PPpre的17.5、16.8和17.2L/min,PPmid和PPpost,分别)。在所有产后测量结果中,相对V^O2峰值${{\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{峰值}}}}$保持低于基线值(基线44.9与PPpre为41.0、42.3和42.5mL/kg/min,PPmid和PPpost,分别),而绝对V♪O2峰值${\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\\mathrm{峰值}}}$迅速达到基线值(基线3.19与在PPpre下3.12、3.23和3.18L/min,PPmid和PPpost,分别)。产后BV(PPpre为5257、4271和5214mL,PPmid和PPpost,分别)和Hbmass(PPpre为654、525和641g,PPmid和PPpost,分别)在PPpre和PPpost之间相似,但在PPmid时随着Q$\\dot{Q}$峰值下降。到干预结束时,峰值功率恢复到孕前值(302vs.303W,基线vs.PPpost)。这些发现表明,产后早期进行SIT可以保护升高的怀孕Q_$\\dot{Q}$峰值,并迅速将绝对V_O2峰值${\\dot{V}}_{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\\mathrm{峰值}}}}$和峰值功率恢复到基线水平。重点:这项研究的中心问题是什么?产后早期进行的剧烈运动训练可以维持妊娠心输出量的增加。主要发现及其重要性是什么?绝对耗氧量的基线值,在产后6周的间歇冲刺训练后,峰值功率输出和峰值运动心输出量可以迅速恢复或超过。Sprint间歇训练可用于经过训练的女性安全地在产后早期恢复训练,允许快速有效地返回到基线健身水平。
During pregnancy an increased cardiac output ( Q ̇ $\\dot{Q}$ ) and blood volume (BV) occur to support fetal growth. Increased Q ̇ $\\dot{Q}$ and BV also occur during chronic endurance exercise training and benefit performance. We investigated if sprint interval training (SIT) undertaken early postpartum maintains the elevated Q ̇ $\\dot{Q}$ and BV of pregnancy and benefits performance. The participant, a competitive field hockey player and former cyclist, visited our laboratory at 2 weeks of gestation (baseline) and postpartum pre-, mid- and post-intervention (PPpre, PPmid and PPpost). Delivery was uncomplicated and she felt ready to start the SIT programme 5 weeks postpartum. Inert gas rebreathing was used to measure peak exercise Q ̇ $\\dot{Q}$ ( Q ̇ $\\dot{Q}$ peak); V ̇ O 2 peak ${{\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{peak}}}}$ was measured with a metabolic cart; and postpartum haematological values were measured with carbon monoxide rebreathing. The 18 SIT sessions progressed from four to eight sprints at 130% of V ̇ O 2 peak ${{\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{peak}}}}$ peak power output. Q ̇ $\\dot{Q}$ peak increased from baseline at all postpartum time points (baseline 16.2 vs. 17.5, 16.8 and 17.2 L/min at PPpre, PPmid and PPpost, respectively). Relative V ̇ O 2 peak ${{\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{peak}}}}$ remained below baseline values at all postpartum measurements (baseline 44.9 vs. 41.0, 42.3 and 42.5 mL/kg/min at PPpre, PPmid and PPpost, respectively) whereas absolute V ̇ O 2 peak ${{\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{peak}}}}$ rapidly reached baseline values postpartum (baseline 3.19 vs. 3.12, 3.23 and 3.18 L/min at PPpre, PPmid and PPpost, respectively). Postpartum BV (5257, 4271 and 5214 mL at PPpre, PPmid and PPpost, respectively) and Hbmass (654, 525 and 641 g at PPpre, PPmid and PPpost, respectively) were similar between PPpre and PPpost but decreased alongside Q ̇ $\\dot{Q}$ peak at PPmid. Peak power was returned to pre-pregnancy values by intervention end (302 vs. 303 W, baseline vs. PPpost). These findings show that SIT undertaken early postpartum defends the elevated Q ̇ $\\dot{Q}$ peak of pregnancy and rapidly returns absolute V ̇ O 2 peak ${{\\dot{V}}_{{{{\\mathrm{O}}}_{\\mathrm{2}}}{\\mathrm{peak}}}}$ and peak power to baseline levels. HIGHLIGHTS: What is the central question of this study? Can the enhanced cardiac output of pregnancy be maintained with strenous exercise training undertaken early postpartum. What is the main finding and its importance? Baseline values of absolute oxygen consumption, peak power output and peak exercise cardiac output can be regained rapidly or surpassed following 6 weeks of sprint interval training postpartum. Sprint interval training can be used by endurance trained females to safely resume training early postpartum, allowing a rapid and efficient return to baseline fitness levels.