GLPs and endurance cardio?

I push through by dragging myself to the gym even when I fade after forty-five minutes, down from ninety before. Strength stays the same but I get shaky sooner, especially training fasted. Endurance feels cut by nearly half. I try to load extra carbs into the evening meal around five or six.

I play league hockey and notice muscles feel weak and tired rather than winded. On game days I eat more and sip small sports drinks, including one on the bench, which makes a noticeable difference though not back to prior levels.

I do long climbs and century rides. While pushing hard on one medication I stopped chasing power numbers, rode for enjoyment, and switched to an e-bike for a few months. After reaching goal weight I moved to low-dose tirzepatide for maintenance and tried a couple peptides. One raised my functional threshold noticeably. Nutrition on the bike needs more planning because digestion slows.

From what I feel, the low-energy state comes from missing carbs and the peptide seems to tap fat stores instead, giving a different kind of reserve that lets me go beyond usual limits. It feels like an extra tank rather than the usual glucose crash. This is just my own sense of it.

After the first few weeks any tiredness passed and my mountain bike rides in the ninety-minute range feel the same or slightly better. I make sure to add carbs before and during rides. It may just be the common startup dip or not eating enough for the effort.

Dropping from long rides to struggling with short runs sounds tough. Hopefully the carb adjustments get your legs moving again.

Fifty-four, on the stronger medication, and track endurance metrics. Peak oxygen uptake hit fifty-four this summer before a recovery period. I felt strong on the mountain bike and wonder if the medication helped access fat stores for fuel. Could be individual or coincidence. Either way, solid nutrition and enough total calories seem necessary to keep energy available.