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. 2017 Jul;33(4):410–419. doi: 10.6515/ACS20161104A

Table 2. Exercise characteristics after exercise according to thalassemia major and iron deficiency anemia group.

Characteristics (mean ± SD or median 25th-75th %) Iron deficiency group (n = 46) Thalassemia group (n = 56) p
HR Stage 1, bpm 107 (±11) 121 (±14) < 0.001
HR Stage 2, bpm 121 (±14) 138 (±16) < 0.001
HR Stage 3, bpm 142 (±16) 159 (±16) < 0.001
HR Stage 4, bpm 173 (±16) 171 (±10) 0.48
RPP Stage 1 146 (±31) 156 (±31) 0.10
RPP Stage 2 178 (±40) 187 (±39) 0.25
RPP Stage 3 204 (±28) 217 (±46) 0.17
RPP Recovery 154 (±32) 141 (±25) 0.03
Peak HR, bpm 181 (±15) 170 (±13) < 0.001
HR reserve 111 (±17) 107 (±11) 0.29
Chronotropic index 84 (±11) 76 (±11) 0.001
Exercise capacity (METs) 13.1 (±1.8) 10.1 (±1.8) < 0.001
Exercise time, minute 11.1 (±1.5) 8.4 (±1.7) < 0.001
1-min HRR 34 (28-51) 31 (24-36) 0.004
2-min HRR 59 (52-70) 50 (40.3-61) 0.002
3-min HRR 64 (59-71) 55 (47.3-68) 0.003
4-min HRR 68 (63-77) 59 (50.5-70.8) 0.001
5-min HRR 68 (60-79) 60 (51-72) 0.002

Values are expressed as mean ± standard deviation or median 25th-75th%. p < 0.05 value is significant. HR, heart rate; METs, metabolic equivalents; RPP, rate pressure product; SD, standard deviation. (Rate Pressure Product = Heart Rate * Systolic Blood Pressure), One way analysis of variance, Independent samples t-test, Mann-Whitney U-test.