 = new Chart(hourlyCtx, {
          type: "line",
          data: {
            labels: [],
            datasets: [
              {
                label: "Heart Rate (Last 3 Hours)",
                data: [],
                borderColor: "rgb(75, 192, 192)",
                backgroundColor: "rgba(75, 192, 192, 0.2)",
                tension: 0.4,
                fill: true,
                spanGaps: true,
              },
            ],
          },
          options: {
            ...defaultOptions,
     