WarrenG said:
The study did one effort for 3-5' and then took one measurement up to 60 seconds later. A usual ramp test will use 3-5' PER STEP in power or running speed, and a normal ramp lactate test will usually include a half dozen steps and measurements along the way to around 4mmol/l, and probably one step beyond that to see how the lactate behaves above 4mmol/l.
You need to read the abstract again, Warren. They did
five 2000 m efforts, which took from 3-5 min each, with the fastest one being a maximal effort that undoubtly resulted in very high lactate levels. Blood for lactate measurements was obtained during the "off" lap, which took <60 s to complete. IOW, they basically replicated what you might do when testing somebody on a treadmill or cycle ergometer, only did it at the rink instead.
WarrenG said:
The study used their single measurement to predict performance at 4mmol/l.
No, it (they) did not. What they attempted to do was predict whether or not lactate would be constant, rising, or falling during a subsequent training session that entailed skating 5 laps "hot", 1 lap easy, a total of nine times. They were able to do so for 16 out of the 20 subjects, which, when you consider the day-to-day variability in blood lactate levels, the fact that they didn't measure maximal lactate steady state but only predicted it from the initial multi-speed test, etc., is actually pretty good.
WarrenG said:
If they had done the test with a more usual protocol for a ramp lactate test
There's nothing at all about the protocol that would lead to different results than what would be obtained in the laboratory.
WarrenG said:
they would have measured the power at, or near their performance at 4mmol/l, which of course would have been near 100% accurate, not 81% accurate like in the study.
Unlikely, since the power corresponding to maximal lactate steady state can be either below or above (usually above, at least in cyclists) the power corresponding to OBLA (i.e., 4 mmol/L).
WarrenG said:
The other problem with the measurement protocol in the study (or more correctly, your extrapolations about the study results) is they weren't gathering the blood samples on the way to 4mmol/l so they miss out on the information that could be obtained from those intermediate measurements.
You're wrong:
"...speed skaters (N = 20) performed HLa-P consisting of 5 x 2000 m/400 m at incremental velocities ranging from very slow to maximal (time = 3.0-5.0 min). Blood lactate measured during a 60-s interval following each repetition was used to construct HLa-P..."
WarrenG said:
You know all of what I've said so I question why you play games about it.
About all that you've said (written) here seems to prove is that you don't know how to read.