HRmax Calculator

This is an RStudio shiny application developed as a part of final project in the Developing Data Products course in the Coursera Data Science Specialization track.

The application calculates your maximum heart rate and the target heart rate zones for the chosen age.

The application includes:

• Its build with shinydashboardPlus library
• Tab menus
• Slider inputs for age, minimum and maximum intensiy
• A short documentation

This app is hosted at https://jletteboer.shinyapps.io/calculate_maximum_heartrate/

The code can be found at https://github.com/jletteboer/Coursera/tree/master/09%20Developing%20Data%20Products

This application uses the listed widgets below.

• widgetUserBox, This box is where the author is mentioned
• gradientBox, These boxes contains the sliderInputs for age, minimum and maximum intensity
• sliderInput, Used for 3 inputs, for age (years), minimum (%) and maximum (%) intensity
• valueBoxOutput, Output bix for showing the results

What is happening inside the app, here is a simple example.

Calculation of maximum heart rate

input_age <- 45
hrmax <- 220 - input_age
hrmax

[1] 175

Calculation of Target HR Zone

input_age <- 45
input_minimum_intensity <- 50
input_maximum_intensity <- 70
minimum_intensity <- 220 - input_age * input_minimum_intensity/100
maximum_intensity <- 220 - input_age * input_maximum_intensity/100
paste0("Target HR Zone of ", input_minimum_intensity, "-", 
       input_maximum_intensity, "% is between ", minimum_intensity, " and ",
       maximum_intensity, " for ", input_age, " years old.")

[1] "Target HR Zone of 50-70% is between 197.5 and 188.5 for 45 years old."

There is adocumentation area in the app. It can be accessed via the menu.

Usage

Fill in your age, minimum and maximum intensity with the sliders and see what your maximum and target heart rates are.