High-Intensity Interval Training in Normobaric Hypoxia Improves Cardiorespiratory Fitness in Overweight Chinese Young Women

Kong, Zhaowei; Shi, Qingde; Nie, Jinlei; Tong, Tiejun; Song, Lili; Liu, Yi; Hu, Yang

doi:10.3389/fphys.2017.00175

Cited by 29 publications

(41 citation statements)

References 47 publications

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“…Nevertheless, it remains unclear how HIE under hypoxia affects cognitive function. As the commonly used hypoxic level to develop cardiorespiratory fitness in athletes [26,27] and to improve cardiometabolic risk factors in sedentary populations [17,18] is around the inspired fraction of oxygen (FIO 2 ) level of 0.154, an integrated understanding of the effect of moderate hypoxia at FIO 2 of 0.154 (equivalent to an elevation of 2500 m) and exercise on cognition might be more practical than other hypoxic levels.…”

Section: Introductionmentioning

confidence: 99%

The Effects of High-Intensity Interval Exercise and Hypoxia on Cognition in Sedentary Young Adults

et al. 2019

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Background and Objectives: Limited research has evaluated the effects of acute exercise on cognition under different conditions of inspired oxygenation. Thus, the purpose of this study was to examine the effects of high-intensity interval exercise (HIE) under normoxia (inspired fraction of oxygen (FIO2): 0.209) and moderate hypoxia (FIO2: 0.154) on cognitive function. Design: A single-blinded cross-over design was used to observe the main effects of exercise and oxygen level, and interaction effects on cognitive task performance. Methods: Twenty inactive adults (10 males and 10 females, 19–27 years old) performed a cognitive task (i.e., the Go/No-Go task) before and immediately after an acute bout of HIE under normoxic and hypoxic conditions. The HIE comprised 10 repetitions of 6 s high-intensity cycling against 7.5% body weight interspersed with 30 s passive recovery. Heart rate, peripheral oxygen saturation (SpO2) and rating of perceived exertion were monitored. Results: The acute bout of HIE did not affect the reaction time (p = 0.204, η2 = 0.083) but the accuracy rate decreased significantly after HIE under both normoxic and hypoxic conditions (p = 0.001, η2 = 0.467). Moreover, moderate hypoxia had no influence either on reaction time (p = 0.782, η2 = 0.004) or response accuracy (p = 0.972, η2 < 0.001). Conclusions: These results indicate that an acute session of HIE may impair response accuracy immediately post-HIE, without sacrificing reaction time. Meanwhile moderate hypoxia was found to have no adverse effect on cognitive function in inactive young adults, at least in the present study.

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Section: Introductionmentioning

confidence: 99%

The Effects of High-Intensity Interval Exercise and Hypoxia on Cognition in Sedentary Young Adults

et al. 2019

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“…After 60 min of aerobic running on 3 days per week for 4 weeks without dietary behavior intervention, no significant change and similar reductions of body weight (<2.0%) were observed in both hypoxic group and normoxic group but there was an added decrease of body FM content [19,39]. Normal diet plus HIIT on 4 days per week for 5 weeks under moderate normobaric hypoxia did not show an additive effect on body weight or body FM but improved more VO 2peak [40]. Keeping a usual living lifestyle combined with twice 90 min 65-70% HRmax exercise per week for 8 months, no additive weight loss (∼3.0%) or body FM loss under hypoxic exposure was found [41].…”

Section: Discussionmentioning

confidence: 75%

“…Among healthy subjects, 3 sessions per week for 4 weeks of intermittent hypoxic training did not show additive effects on blood TC, LDL-C, or HDL-C compared with training under normoxia [54]. Most previous publications addressing overweight or obesity reported that training under hypoxia has not additive benefits to the serum lipid profiles compared with training under normoxia [19,20,40]. After 10 days of moderate-altitude walking, the TC and LDL-C of metabolic syndrome subjects decreased significantly but with almost the same change as that of the low-altitude control group [55].…”

Section: Discussionmentioning

confidence: 83%

Effects of Living High‐Training Low and High on Body Composition and Metabolic Risk Markers in Overweight and Obese Females

Gao

Zhang

et al. 2020

BioMed Research International

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This study examined the effects of 4 weeks of living high-training low and high (LHTLH) under moderate hypoxia on body weight, body composition, and metabolic risk markers of overweight and obese females. Nineteen healthy overweight or obese females participated in this study. Participants were assigned to the normoxic training group (NG) or the LHTLH group (HG). The NG participants lived and trained at sea level. The HG participants stayed for approximately 10 hours in a simulated 2300 m normobaric state of hypoxia for six days a week and trained for 2 hours 3 times a week under the same simulated hypoxia. The interventions lasted for 4 weeks. All groups underwent dietary restriction based on resting metabolic rate. The heart rate of the participants was monitored every ten minutes during exercise to ensure that the intensity was in the aerobic range. Compared with the preintervention values, body weight decreased significantly in both the NG and the HG (−8.81 ± 2.09% and −9.09 ± 1.15%, respectively). The fat mass of the arm, leg, trunk, and whole body showed significant reductions in both the NG and the HG, but no significant interaction effect was observed. The percentage of lean soft tissue mass loss in the total body weight loss tended to be lower in the HG (27.61% versus 15.94%, P=0.085). Between the NG and the HG, significant interaction effects of serum total cholesterol (−12.66 ± 9.09% versus −0.05 ± 13.36%,) and apolipoprotein A1 (−13.66 ± 3.61% versus −5.32 ± 11.07%, P=0.042) were observed. A slight increase in serum high-density lipoprotein cholesterol (HDL-C) was observed in the HG (1.12 ± 12.34%) but a decrease was observed in the NG (−11.36 ± 18.91%). The interaction effect of HDL-C between NG and HG exhibited a significant trend (P=0.055). No added effects on serum triglycerides (TGs), low-density lipoprotein cholesterol (LDL-C), or APO-B were observed after 4 weeks of LHTLH. In conclusion, 4 weeks of LHTLH combined with dietary restriction could effectively reduce the body weight and body fat mass of overweight and obese females. Compared with training and sleeping under normoxia, no additive benefit of LHTLH on the loss of body weight and body fat mass was exhibited. However, LHTLH may help to relieve the loss of lean soft tissue mass and serum HDL-C.

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“…15 However, in some cases, these results are contradictory. 13,16,17 A recent study 18 indicated that 5 weeks of HIIT in moderate hypoxia improve cardiorespiratory fitness, but it does not have an additive effect to enhance body composition or the lipid profile. Additionally, both protocols evaluated in the current study have been reported to be effective at improving total and trunk fat mass immediately following a program.…”

Section: Introductionmentioning

confidence: 99%

Detraining effect on overweight/obese women after high‐intensity interval training in hypoxia

Camacho-Cardeñosa

Olcina

et al. 2019

Scandinavian Med Sci Sports

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Purpose Promising benefits on fat mass and biochemical components may be reported after applying programs of cyclic hypoxia and HIIT. Aim To investigate the effect of a month of detraining on cardiometabolic risk markers after active hypoxia exposure. Methods Participants included 59 overweight/obese women, who started a 12‐week program of 36 sessions, and were randomly divided into four groups: (a) aerobic interval training in hypoxia (AitH; FiO2 = 17.2%; n = 13), (b) aerobic interval training in normoxia (AitN; n = 15), (c) sprint interval training in hypoxia (SitH; FiO2 = 17.2%; n = 15), and (d) sprint interval training in normoxia (SitN; n = 18). Body composition, anthropometric, and biochemical parameters were assessed at baseline (A), after 36 training sessions (B) and after 4 weeks of detraining (C). Results Hypoxia conditions showed a significant positive effect on waist circumference (P = 0.01), WHR (P = 0.04), and percentage of trunk fat mass (P < 0.001). The percentage of trunk fat continued to decrease significantly after training cessation in both AitH and SitH groups. Conclusion After 4 weeks of detraining with a previous 12 weeks of high‐intensity interval training under cyclic normobaric hypoxia, the percentage of fat mass located in the trunk decreases significantly and this effect was not observed in the normoxia groups.

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High-Intensity Interval Training in Normobaric Hypoxia Improves Cardiorespiratory Fitness in Overweight Chinese Young Women

Cited by 29 publications

References 47 publications

The Effects of High-Intensity Interval Exercise and Hypoxia on Cognition in Sedentary Young Adults

The Effects of High-Intensity Interval Exercise and Hypoxia on Cognition in Sedentary Young Adults

Effects of Living High‐Training Low and High on Body Composition and Metabolic Risk Markers in Overweight and Obese Females

Detraining effect on overweight/obese women after high‐intensity interval training in hypoxia

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