/**
* Inverse calculation
*
* Calculation is done for HR in [bpm] and time is transformed from [s] to [min].
*
* @param int $bpm [bpm]
* @param int $trimp value to reach
*/
protected function calculate($bpm, $trimp)
{
$Factor = new Factor($this->Athlete->gender());
$max = $this->Athlete->knowsMaximalHeartRate() ? $this->Athlete->maximalHR() : Calculator::DEFAULT_HR_MAX;
$rest = $this->Athlete->knowsRestingHeartRate() ? $this->Athlete->restingHR() : Calculator::DEFAULT_HR_REST;
$hr = max(0, ($bpm - $rest) / ($max - $rest));
$sum = $trimp / ($hr * exp($Factor->B() * $hr));
$this->value = 1 / $Factor->A() * $sum * 60;
}
/**
* Calculate
*
* Calculation is done for HR in [bpm] and time is transformed from [s] to [min].
*/
protected function calculate()
{
$Factor = new Factor($this->Athlete->gender());
$max = $this->Athlete->knowsMaximalHeartRate() ? $this->Athlete->maximalHR() : self::DEFAULT_HR_MAX;
$rest = $this->Athlete->knowsRestingHeartRate() ? $this->Athlete->restingHR() : self::DEFAULT_HR_REST;
$sum = 0;
$B = $Factor->B();
foreach ($this->Data as $bpm => $t) {
$hr = max(0, ($bpm - $rest) / ($max - $rest));
$sum += $t / 60 * $hr * exp($B * $hr);
}
$this->value = $Factor->A() * $sum;
}
