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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/*
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* Copyright (c) 2009 Sean C. Rhea (srhea@srhea.net)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "RideMetric.h"
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#include <QObject>
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#define tr(s) QObject::tr(s)
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// This metric computes aerobic decoupling percentage as described
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// by Joe Friel:
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//
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// http://www.trainingbible.com/pdf/AeT_Training.pdf
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//
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// Aerobic decoupling is a measure of how much heart rate rises or
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// how much power falls off during the course of a long ride. Joe suggests
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// that a rise of more than 5% in the heart rate to power ratio between the
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// two halfs of a long ride indicates that the ride was performed above the
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// aerobic threshold.
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//
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// How you actually compute these things over messy data isn't always
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// straightforward. For this implementation, I cut the set of data points in
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// half and compute the average power and heart rate over all the points in
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// either half that have a non-zero heart rate. I then calculate the change
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// in heart rate to power ratio as described by Friel.
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class AerobicDecoupling : public RideMetric {
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double percent;
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public:
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AerobicDecoupling() : percent(0.0)
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{
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setSymbol("aerobic_decoupling");
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setName(tr("Aerobic Decoupling"));
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setType(RideMetric::Average);
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setMetricUnits(tr("%"));
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setImperialUnits(tr("%"));
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setPrecision(2);
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}
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void compute(const RideFile *ride, const Zones *, int,
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const QHash<QString,RideMetric*> &) {
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double firstHalfPower = 0.0, secondHalfPower = 0.0;
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double firstHalfHR = 0.0, secondHalfHR = 0.0;
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int halfway = ride->dataPoints().size() / 2;
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int count = 0;
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int firstHalfCount = 0;
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int secondHalfCount = 0;
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percent = 0;
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foreach(const RideFilePoint *point, ride->dataPoints()) {
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if (count++ < halfway) {
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if (point->hr > 0) {
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firstHalfPower += point->watts;
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firstHalfHR += point->hr;
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++firstHalfCount;
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}
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}
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else {
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if (point->hr > 0) {
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secondHalfPower += point->watts;
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secondHalfHR += point->hr;
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++secondHalfCount;
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}
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}
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}
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if ((firstHalfPower > 0) && (secondHalfPower > 0)) {
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firstHalfPower /= firstHalfCount;
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secondHalfPower /= secondHalfCount;
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firstHalfHR /= firstHalfCount;
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secondHalfHR /= secondHalfCount;
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double firstHalfRatio = firstHalfHR / firstHalfPower;
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double secondHalfRatio = secondHalfHR / secondHalfPower;
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percent = 100.0 * (secondHalfRatio - firstHalfRatio) / firstHalfRatio;
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}
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setValue(percent);
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}
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RideMetric *clone() const { return new AerobicDecoupling(*this); }
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};
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static bool add() {
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RideMetricFactory::instance().addMetric(AerobicDecoupling());
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return true;
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}
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static bool added = add();
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