We examined cross-country skiing-related strain in 10 less experienced postinfarction patients, performing a skiing test, covering a distance of approximately 7 km in 90 min. Heart rates, cardiac arrhythmia, lactic acid levels and catecholamine excretions were determined as strain indicators. The patients' exercise capacity, estimated during graded ergometric cycling, was 2.1 +/- 0.4 watts.kg-1, indicating a nearly age-appropriate submaximum performance ability. They had suffered myocardial infarction 2.8 +/- 0.7 years previously, participated regularly in a rehabilitation program for at least one year, and they did not show coronary insufficiency or significant cardiac dysrhythmias during laboratory testing under their usual medications. They went cross-country skiing during a 4-day instruction period and subsequently performed a cross-country skiing test on the 5th day. Mean skiing-related heart rates (124 +/- 9 bpm) and adrenaline excretions (124 +/- 88 pmol.min-1) corresponded on average to an exercise level of 1.85-2.0 watts.kg-1 during laboratory testing, and mean noradrenaline excretions (586-343 pmol.kg-1) and lactate concentrations (3.83 +/- 2.18 mmol.l-1) to a level of 1.48-1.73 watts.kg-1. Cardiac dysrhythmias were observed in a moderate number of 6-8 SVES, 9 to 12 VES and 4 to 7 couplets of VES per 1000 beats during cross-country skiing. The present results point to a comparatively high cardiovascular strain in less experienced postinfarction patients during a cross-country skiing test at an intensity level thought to be moderate.

译文

我们在10名经验较少的梗塞后患者中检查了越野滑雪相关的菌株,并进行了滑雪测试,在90分钟内覆盖了约7千米的距离。心率,心律不齐,乳酸水平和儿茶酚胺排泄物被确定为应变指标。在分级的测功循环过程中估计的患者运动能力为2.1/- 0.4瓦.kg-1,表明几乎适合年龄的次最大表现能力。他们在2.8 +/- 0.7年前患有心肌梗塞,定期参加康复计划至少一年,并且在常规药物的实验室测试中没有显示冠状动脉供血不足或明显的心律不齐。他们在为期4天的指导期间进行了越野滑雪,随后在第5天进行了越野滑雪测试。滑雪相关的平均心率 (124 +/- 9 bpm) 和肾上腺素排泄物 (124 +/- 88 pmol.min-1) 在实验室测试期间平均对应于1.85-2.0瓦.kg-1的运动水平,和平均去甲肾上腺素排泄物 (586-343 pmol.kg-1) 和乳酸浓度 (3.83 +/- 2.18 mmol.l-1) 至1.48-1.73瓦.kg-1的水平。在越野滑雪期间,每1000搏动中观察到中等数量的6-8个svs,9至12个VES和4至7对VES。目前的结果表明,在越野滑雪测试中,经验较少的梗死后患者的心血管压力较高,强度被认为是中等的。

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