The following is from my stationary cycle trainer workout today. After a
10 minute warm-up I start the clock and crank up to 300 watts (power tap
measurement accurate to within 1%). The heart rate response is still
slow but at least I can complete the workout. My perceived level of
exertion is constant throughout (fairly hard).
HR Mile Time (min)
128 1 2.5
130 2 5.0
131 3 7.5
132 4 10
138 5 12.5
140 6 15
141 7 17.5
143 8 20
147 9 22.5
147 10 25
6 months ago I would [censored] out at about the 4 mile level with a HR of
128. The above workout is done at a level loading of 300 watts ( this
would solicit a time trial speed of ~26mph). At the time, after a few
visits to the Cardiologist and the usual testing, the chronotropic
incompetence tendency was never satisfactorily diagnosed but my bicuspid
aortic valve was. Blood ejection velocity 2m/s and 5mm delta p across
the valve. Since then I feel a lot better and most of my pre-incident
performance has returned. Comments welcomed (especially what is
happening physiologically at the 4 to 5 mile mark). My previous max HR
had been 160 for the last 10 years or so and I think this is slowly
coming back.
Phil Holman