INTRODUCTION Long-duration dives on consecutive days reduces muscular performance, potentially affecting military personnel. However, a paucity of data exists on how breathing gases affect endurance performance. This study examined the influence of long-duration diving with different breathing gases on aerobic endurance and handgrip performance. METHODS Twenty-three military divers completed a single 6-h dive (single dive [SD]) and five 6-h dives over consecutive days (dive week [DW]) with 30-min cycling intervals using air (AIR, n = 13) or 100% oxygen (OXY, n = 10). Before and after SD and DW, subjects completed a maximum handgrip strength test, a handgrip endurance test at 40% maximal strength, and a time to exhaustion run. RESULTS Handgrip endurance decreased after DW in OXY (SD, 1.9 ± 0.0 vs 1.4 ± 0.3 min) compared with AIR (1.8 ± 0.0 vs 1.8 ± 0.2 min) ( P < 0.001). Run time decreased after SD (Pre, 20.7 ± 10.4 min; Post, 16.6 ± 7.6 min; P = 0.039) and DW (Pre, 21.6 ± 9.0 min; Post, 11.2 ± 4.0 min; P < 0.001) in OXY and after overall diving in AIR (Pre, 26.5 ± 10.2 min; Post, 22.3 ± 7.5 min; P = 0.025). V̇O 2 decreased after diving only in AIR (Pre, 42.6 ± 3.4 mL·kg -1 ⋅min -1 ; Post, 40.4 ± 3.7 mL·kg -1 ⋅min -1 ; P = 0.010). There were no other significant effects. CONCLUSIONS Breathing 100% oxygen during long-duration dives on consecutive days may exacerbate decreases in aerobic endurance and impairs handgrip endurance compared with air. Additional research is needed to elucidate mechanisms of action and possible mitigation strategies.

中文翻译：

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与空气相比，呼吸 100% 氧气时，在 1.35 ATA 下潜水 6 小时后，耐力运动表现会降低。


简介 连续几天长时间潜水会降低肌肉性能，可能会影响军事人员。然而，关于呼吸气体如何影响耐力表现的数据很少。本研究探讨了使用不同呼吸气体的长时间潜水对有氧耐力和握力性能的影响。方法 23 名军事潜水员使用空气完成了一次 6 小时潜水（单次潜水 [SD]）和连续几天（潜水周 [DW]）的五次 6 小时潜水，间隔 30 分钟循环使用空气（AIR，n = 13） ) 或 100% 氧气 (OXY, n = 10)。在SD和DW之前和之后，受试者完成了最大握力测试、40%最大力量的握力耐力测试以及力竭跑时间。结果 与 AIR 相比（1.8 ± 0.0 vs 1.8 ± 0.2 min），OXY DW 后握力耐力下降（SD，1.9 ± 0.0 vs 1.4 ± 0.3 min）（P < 0.001）。在 OXY 中和总体后，SD（前，20.7 ± 10.4 分钟；后，16.6 ± 7.6 分钟；P = 0.039）和 DW（前，21.6 ± 9.0 分钟；后，11.2 ± 4.0 分钟；P < 0.001）后运行时间减少在空气中潜水（前，26.5 ± 10.2 分钟；后，22.3 ± 7.5 分钟；P = 0.025）。仅在空气中潜水后 V̇O 2 下降（前，42.6 ± 3.4 mL·kg -1 ⋅min -1 ；后，40.4 ± 3.7 mL·kg -1 ⋅min -1 ；P = 0.010）。没有其他显着影响。结论 与空气相比，连续几天长时间潜水时呼吸 100% 氧气可能会加剧有氧耐力的下降，并损害握力耐力。需要进行更多研究来阐明作用机制和可能的缓解策略。