The message <[email hidden]>
from Dave Fawthrop <[email hidden]> contains these words:
Quoted message said:Using the rule of thumb that 1000ft ascent = one mile on the level the
suggested route is 28 miles.
I have several times in the past quoted from research carried out by a
Gordon Waddell on energy expenditure when walking (undertaken in the
early 60s). He came up with the formula:
E = 100(10 + R +2C + 4H) for total energy expenditure over a 24 hour period.
Where R = road miles, C = cross country miles, H = height gained in
1000s of feet and E is in Kilocalories.
On that basis a road mile is equivalent to just 250 feet of ascent and a
cross country mile just 500.
I am not altogether convinced that much of what we do off road could
reasonably be called cross country but it usually requires more effort
than road walking so perhaps an extra term halfway between the 2 is
called for for path walking. Say 100(10 + R + 3P/2 +2C + 4H).
Anyway using the original formula my recent epic (taken as 6 road miles,
12 cross country miles and 5000 feet of ascent with no extra for
Striding Edge) gives 6000 kcals, the Buttermere Round of 15 miles and
6000 feet (mentioned elsewhere in this thread) gives 6400 kcals and the
projected walk of 21 miles and 8000 feet 8400 kcals. By contrast my
target walks (15 + 4 max) are a wimpish 5400 kcals.
Waddells take on energy bands is:
4000 - 6000 kcals - a long tiring day's walk but within the capabilities
of most reasonably fit and experienced people over about 16 years of
age.
6000 - 8000 kcals - a full, strenuous day only suitable for it
experienced people who are in training and willing to spend 12/18 hours
on the move.
8000 - 10000 kcals - an extremely strenuous day necessitating being on
the move for most of the 24 hours; only to be undertaken after several
months of training by fit, experienced people and probably the upper
limit for most mountaineers.
Over 10000 kcals - (the equation is not proven for this range) - only
for exceptional people after very strict training.
Quoted message said:Long ago when I was young and fit I did 35 miles in a day, so it should be
possible to the young and very fit.
Some popular walks (approximate lengths)
Yorkshire 3 Peaks (4 +20, 5) 7400 kcals
Lyke Wake Walk (40, 5) 11000 kcals
Welsh 3000s (peak to peak) (23 - 10) 9600 kcals
Welsh 3000s (bottom to bottom) (27, 13) 11600 kcaIs
Lakes 3000s (10 + 35, 10) 13000 kcals
I have listed the above walks in what I consider the order of difficulty
which lends some credence to my notion that we usually avoid real cross
country walking. The excessively large figures are also not in keeping
with Waddells range guide. Substituting 1.5P for 2C in the formula would
reduce these figures to 6400, 9000, 8450, 10250 and 11250. That still
puts the Lyke Wake Walk ahead of the Welsh 3000s (peak to Peak) but as I
have never done that in isolation it could well be correct but I would
dispute the notion that the LWW was almost as tough as the W3000s
overall. Perhaps 1.25P would be even more appropriate. And on the basis
of the range guide 11250 seems too high for a walk that must be done by
hundreds of walkers every year.
--
Roger Chapman so far this year 34 summits
New - 15 (Marilyns 4, Sweats 1, Outlying Fells 10)
Repeats - 19 (Marilyns 5, Sweats 10, Wainwrights 12, Outlying Fells 0)