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@gbj_tester
See http://help.trainingpeaks.com/entries/22985260-Training-Stress-Scores-Explained
If there is power data, it's based on just power data.
If you're at altitude and not fully acclimatised, it's unsurprising that your cardiopulmonary system is struggling to keep up, and your power output is down. Your heart and lungs are getting the same workout as usual, but your legs are getting something different, due to the lower load.