How can i make this script reduce stamina when sprinting?

Like the title asked.

UserInputService.InputBegan:connect(function(input, event)
    if event then return end
    if event then return end
    if input.KeyCode == Enum.KeyCode.W then
        if not start then
            start = tick()
        else
            if tick() - start < 0.2 then
                start = false
                if Running == false then
                    print("Running")
                    Running = true

                    game.ReplicatedStorage.RemoteEvents.StartRunEvent:FireServer()
                    current:Play()

                    local RandomNumber = math.random(0, 1)
                    if RandomNumber == 1 then
                        Player.Data.AgilityEXP.Value = Player.Data.AgilityEXP.Value+math.random(5, 8)

                    Player.Backpack.PlayerSetup.CombatSystem.Disabled = true

                    end
                end
            else

                start = tick() --reset counter
            end
        end
    end     
end)

UserInputService.InputEnded:connect(function(input, event)
    if input.KeyCode ~= Enum.KeyCode.W then return end;
    if Running == true then
        print("Walking")
        Running = false
        game.ReplicatedStorage.RemoteEvents.StopRunEvent:FireServer()
        current:Stop()
        Player.Backpack.PlayerSetup.CombatSystem.Disabled = false
    end
end)

Is there also a way i can make it where a stamina bar goes down when the player is sprinting with this script?