نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده علوم ورزشی، دانشگاه خوارزمی، تهران، ایران
2 گروه تربیت بدنی، دانشگاه پیام نور ساوه، ایران
3 گروه آموزش تربیت بدنی، دانشگاه فرهنگیان، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and Purpose: Cooling-down after an intensive exercise has been studied widely, while evidence on the role of hypoxia in optimal cooling-down are rare. Present study aimed to compare the effects of cooling-down through hypoxia-hypercapnia or normoxia on fatigue and blood lactate concentration in elite triathletes and swimmers after an exhaustive swimming activity.
Materials and Methods: Ten elite swimmers (age, 21.4 ± 4.16 years; height, 187.1 ± 6.3 cm; weight, 76.3 ± 6.4 kg) from the triathlon and swimming men’s national team (at least 3 years of experience as a member of national team) performed an exhaustive swimming protocol followed by either hypoxia-hypercapnia or normoxia recovery, in two separate sessions, with one week intervening. The exhaustive swimming protocol included 4×50 meters all-out swimming with 10 s rest between the intervals. Afterward, subjects in hypoxia-hypercapnia grouphad 8 min active recovery in hypoxia-hypercapnia, while, subjects in normoxia group had 8 min active recovery in normoxia condition. Blood lactate level and rate of fatigue (ROF) were measured immediately after, 5 min and 8 min after recovery. ANCOVA was used to analyze the data at p≤ 0.05 significance level.
Results: Cooling-down through hypoxia-hypercapnia resulted in lower blood lactate level 5 and 8 min after recovery compared to normoxia condition (P = 0.02 and P = 0.03, respectively). Moreover, ROF was significantly lower after 8 min in hypoxia-hypercapnia condition than normoxia condition (P = 0.04).
Conclusions: It seems that cooling-down in hypoxia-hypercapnic condition resulting in better recovery after exhaustive swimming than normoxia condition. However, further studies are needed to understand possible mechanisms of this type of recovery.
کلیدواژهها [English]