|If you haven't seen an altitude chamber like this (hypoxico.com) in your gym, you will have a hard time copying the training protocol of the study at hand.|
You are thus probably aware of the purported link between a lack of oxygen in the air you breath and the amount of energy your cells consume. As a regular at the SuppVersity you will also be aware that athletes have used the adaptive response to training in hyopxia (which is like high intensity training for your mitochondria) is highly useful for (endurance) athletes.
During their stays in altitude training camps, researchers observed significant reductions of body mass and fat mass and an increase in insulin sensitivity obesity researchers can hardly ignore. It is thus only logical that scientists from the Osaka Institute of Health conducted a study to examine the effects of exercise training under mild hypoxic conditions on body composition and circulating adiponectin levels in postmenopausal women, which is not only one of the subject groups that is at highest risk of unhealthy weight gain, but also as different from the young, lean, male athlete in the average "altitude training camp"-study.
To assess whether postmenopausal women would benefit to a similar extend from training under (albeit mild) oxygen-deprivation, fourteen postmenopausal women (56 +/- 1 years) were assigned to train either under normoxic (N group) or hypoxic (H group) conditions.
Don't be a fool! Wearing a mask that will make it hard for you to breath is significantly different from training at high altitudes and it is more than unlikely that the stupid masks will produce anywhere similar results to training in a true low oxygen environment, where you breath easy, but simply don't get the normal amount of oxygen with every breath.Both groups performed the same 30-minute aquatic exercise program at only 50% of their individual peak oxygen uptake level four times per week for 8 weeks.
"The subjects were required to perform exercise maintaining approximately the target HR, which was predetermined from a cycling exercise (pretest), at an intensity of 50%VO _ 2peak. To achieve the target HR, instructors also gave movement instructions to individual participants. Water level was set at around the xiphisternal level (water temperature 27–29°C). The N group performed exercise training under normobaric normoxic conditions (749 3–750 0 mmHg). On the other hand, the H group performed exercise training under hypobaric hypoxic conditions corresponding to 2000 m above sea level (600 1–603 8 mmHg) [... Otherwise] Participants in both groups were instructed to main tain their normal diet and to refrain from any other specific exercise training throughout the study period" (Nishiwaki. 2015).In that, it is important to note that the subjects in the H group were exposed to the low oxygen condition which mimicked training at 2000 m above sea level for more than just the 30 minutes of (under normoxic conditions) actually pretty light exercise.
|Figure 1: The sign. reductions in body fat and visceral fat were highly (inversely) correlated to the changes in adiponectin the scientists observed. The inter-group differences are impressive (Nishiwaki. 2015),|
- Katayama, Keisho, et al. "Substrate utilization during exercise and recovery at moderate altitude." Metabolism 59.7 (2010): 959-966.
- Nishiwaki, et al. "The effects of exercise training under mild hypoxic conditions on body composition and circulating adiponectin in postmenopausal women." Clin Physiol Funct Imaging (2015): Accepted article.