PTCase ReportJournal of physical therapy science2017

Effects of 2-week intermittent training in hypobaric hypoxia on the aerobic energy metabolism and performance of cycling athletes with disabilities.

Sang-Hoon Kim, Ho-Jung An, Jung-Hyun Choi and 1 others

PMID 28626339

WHAT IT FOUND

Three athletes with physical disabilities shortened 14-km time trials and reached higher loads after 12 hypoxic training sessions, but peak oxygen measures did not clearly improve.

Training, hypoxia, coaching, and iron supplements were given together. Only three cases.

Key findings

01All three athletes shortened their 14-km time trials after 12 sessions: A by 1′41″ (5.1%), B by 8′54″ (16.0%), and C by 1′07″ (4.4%).

02All three athletes increased all-out time by 2′09″ (13.1%), 2′43″ (18.7%), and 1′22″ (7.4%), and increased exercise load during all-out time by 13 W (8.0%), 12 W (16%), and 25 W (9.1%).

03Relative VO2 max and HRmax showed no noticeable changes after training except for B athlete, and no inferential statistical analysis was performed because there were only three participants.

STILL TO COME

How it was doneWhat they foundWhat it means for PTs

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What it does not show

Only three athletes were studied, and no inferential statistical analysis was performed, so these are individual case records rather than evidence that the training works. There was no control group, so the athletes could not be compared with athletes who did not receive the program. The athletes received hypobaric hypoxia, complex roller-type cycling training, individualized coaching, heart-rate and workload monitoring, and recommended iron supplements together, so the contribution of any single component cannot be separated. The participants were national team cyclists with specific disabilities, so the findings may not apply to less trained patients or other disability groups. The outcomes were exercise and sport performance measures, not everyday function, participation, pain, or clinical goals. The authors state that the 2-week program may have been too short to change maximal exercise capacity.

The easy way to misread this

Do not read the faster time trials as proof that hypobaric hypoxia training works. The study included only three athletes, had no control group, and did not use inferential statistics. The athletes also received complex roller-type cycling training, individualized coaching, heart-rate and workload monitoring, and recommended iron supplements, so the contribution of any single component cannot be separated.

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