ロープウエーによる急激な高度上昇が登山時の心拍応答に及ぼす影響

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  • Effect of a rapid aerial tramway ascent to a higher altitude on heart rate response during mountain hiking
  • ロープウエー ニ ヨル キュウゲキ ナ コウド ジョウショウ ガ トザンジ ノ シンパク オウトウ ニ オヨボス エイキョウ

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<p>  The aim of this study was to examine the effect of rapid ascent by aerial tramway, without physical exertion, to moderately high altitude on heart rate response during mountain hiking. Twenty-three healthy volunteers (27.9 ± 11 yr) arrived at the aerial tramway Base station (1,308 m) at midnight. After a few hours sleep they were transported by aerial tramway to the Top station (2,156 m) within 7 min. Then, they hiked 1.7 km to mountain Lodge (2,385 m). Heart rate (HR) was continuously measured during the hiking and HR from a section of steep slope was analyzed (815 m, 2,140-2,360 m, 31.2% incline). Anaerobic threshold (AT) was determined in 10 of the 23 subjects at sea level. HR increased with ascent to the altitude from Base to Lodge at rest. Change of HR between Top and Base was 112 ± 11% at rest (HRTop/Base). HRTop/Base positively correlated with blood lactate at TOP (LATop). No significant change was observed in blood pressure at the higher altitude. Mean HR response during exercise was 156 ± 17 beats/min on the steep slope, equivalent to 68.3% of their HR reserve (%HRR). The %HRR positively correlated with HRTop/Base and with LATop. Relative response of HR during steep slope (%ATHR) was 108 ± 18% which correlated with HRTop/Base and with LATop. Rapid ascent results in increased HR response during mountain hiking. This study suggests that rapid ascent to a higher altitude can cause marked cardio-respiratory responses during mountain hiking, even in moderately high altitude mountains.</p>

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