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| Date | Meet | Equipment | Squat (kg) | Bench (kg) | Deadlift (kg) | Total (kg) | DOTS |
|---|---|---|---|---|---|---|---|
| 1979-11-02 | Men's World Powerlifting Championships | Single-ply | — | 130 | 200 | — | 454.01 |
| 1980-06-01 | Japanese Nationals | Single-ply | — | 140 | — | — | 494.52 |
| 1980-11-07 | Men's World Powerlifting Championships | Single-ply | 190 | 145.5 | — | — | 496.08 |
| 1981-11-05 | Men's World Powerlifting Championships | Single-ply | 215 | 147.5 | 215 | 577.5 | 516.89 |
| 1985-03-03 | Hawaii Invitational | Single-ply | 210 | 155 | 230 | 595 | 532.56 |
| 1988-11-11 | Men's World Powerlifting Championships | Single-ply | 202.5 | 160 | 225 | 587.5 | 523.61 |
| 1989-11-13 | World Powerlifting Championships | Single-ply | 210 | 160.5 | 230 | 600.5 | 537.48 |
| 1990-06-24 | Japanese Men's Nationals | Single-ply | — | 165 | — | — | 521.37 |
| 1991-03-31 | Japanese Bench Press Championships | Single-ply | — | 165.5 | — | — | 139.27 |
| 1991-11-14 | Men's World Powerlifting Championships | Single-ply | 215 | 157.5 | 230 | 602.5 | 539.27 |
| 1992-11-19 | Men's World Powerlifting Championship | Single-ply | 210 | 137.5 | 217.5 | 565 | 507.31 |
| 1993-11-27 | World Powerlifting Championships | Single-ply | 202.5 | 155 | 225 | 582.5 | 521.37 |
| 1994-11-17 | Men's World Powerlifting Championships | Single-ply | 205 | 162.5 | 225 | 592.5 | 530.32 |
| 1995-11-15 | Men's World Powerlifting Championships | Single-ply | 205 | 160 | 225 | 590 | 530.59 |
| 1997-10-31 | Asian Powerlifting Championships | Single-ply | — | 177.5 | — | — | 523.04 |
| 1999-12-09 | World Bench Press Championships | Single-ply | — | 177.5 | — | — | 150.23 |
| 2000-06-03 | Japanese Bench Press Championships | Single-ply | — | 172.5 | — | — | 147.18 |
| 2000-06-11 | Japanese Master's Nationals | Single-ply | 220 | 170 | 235 | 625 | 527.53 |
| 2001-09-01 | Japanese Bench Press Championships | Single-ply | — | 190 | — | — | 159.4 |
| 2001-11-15 | Men's World Powerlifting Championships | Single-ply | — | 192.5 | — | — | 544.54 |
| 2001-12-07 | World Bench Press Championships | Single-ply | — | 205.5 | — | — | 160.63 |
| 2002-06-01 | Japanese Juniors & Masters Nationals | Single-ply | 225 | 190 | 235 | 650 | 556.47 |
| 2002-07-13 | Japanese Powerlifting Championships | Single-ply | 220 | 190 | 220 | 630 | 536.55 |
| 2002-12-05 | World Bench Press Championships | Single-ply | — | 195 | — | — | 166.38 |
| 2004-06-26 | Japanese Juniors & Masters Powerlifting Championships | Single-ply | 210 | — | — | — | — |
| 2004-07-16 | Japanese Powerlifting Championships | Single-ply | 220 | 200 | 230 | 650 | 550.09 |
| 2004-10-02 | Japanese Bench Press Championships | Single-ply | — | 200 | — | — | 168.85 |
| 2004-11-09 | Men's World Powerlifting Championships | Single-ply | 207.5 | 175 | 222.5 | 605 | 542.19 |
| 2004-12-02 | World Bench Press Championships | Single-ply | — | 182.5 | — | — | 163.35 |
| 2005-01-12 | World Open Bench Press Championships | Single-ply | — | 170 | — | — | 152.52 |
| 2005-04-20 | World Masters Bench Press Championships | Single-ply | — | 200 | — | — | 169.51 |
| 2005-07-14 | World Games | Single-ply | 227.5 | — | — | — | — |
| 2005-10-04 | World Masters Powerlifting Championships | Single-ply | 222.5 | — | 225 | — | — |
| 2005-11-08 | Men's World Powerlifting Championships | Single-ply | 212.5 | 170 | 232.5 | 615 | 550.46 |
| 2006-05-23 | World Bench Press Championships | Single-ply | — | 170 | — | — | 153.13 |
| 2006-10-02 | World Masters Powerlifting Championships | Single-ply | 207.5 | 180 | 235 | 622.5 | 542.9 |
| 2006-11-05 | World Powerlifting Championships | Single-ply | 215 | 170 | 237.5 | 622.5 | 559.38 |
| 2007-05-02 | Asian Powerlifting Championships | Single-ply | 205 | 180 | 225 | 610 | 546.84 |
| 2007-10-14 | World Powerlifting Championships | Single-ply | 220 | 185 | 220 | 625 | 562.97 |
| 2008-09-30 | World Masters Powerlifting Championships | Single-ply | 220 | 177.5 | 225 | 622.5 | 545.33 |
| 2008-10-30 | World Powerlifting Championships | Single-ply | 215 | 172.5 | 225 | 612.5 | 549.78 |
| 2009-11-02 | World Powerlifting Championships | Single-ply | 210 | 167.5 | 215 | 592.5 | 533.01 |
| 2010-11-07 | World Powerlifting Championships | Single-ply | 205 | 162.5 | 215 | 582.5 | 521.37 |
| 2011-11-08 | World Powerlifting Championships | Single-ply | 220 | 175 | 210 | 605 | 527.8 |
| 2011-12-05 | Asian Powerlifting Championships | Single-ply | 227.5 | 175 | 220 | 622.5 | 539.32 |
| 2013-05-31 | Japanese Powerlifting Championships | Single-ply | 232.5 | 165 | 210 | 607.5 | 522.54 |
| 2013-11-04 | World Powerlifting Championships | Single-ply | 210 | 165 | 210 | 585 | 503.91 |
| 2014-06-21 | Japanese Powerlifting Championships | Single-ply | 100 | 145 | 175 | 420 | 365.97 |
| 2014-09-06 | Japanese Masters Classic Powerlifting Championships | Raw | 142.5 | 122.5 | 190 | 455 | 394.26 |
| 2014-11-29 | Japanese Bench Press Championships | Single-ply | — | 157.5 | — | — | 137.4 |
| 2015-06-27 | Japanese Powerlifting Championships | Single-ply | 182.5 | 155 | 177.5 | 515 | 449.48 |
| 2015-09-12 | Japanese Classic Masters Powerlifting Championships | Raw | 135 | 115 | 160 | 410 | 364.12 |
| 2015-10-31 | Japanese Bench Press Championships | Single-ply | — | 150 | — | — | 131.01 |
| 2016-04-19 | World Bench Press Championships | Single-ply | — | 140 | — | — | 123.11 |
| 2016-05-27 | Japanese Powerlifting Championships | Single-ply | 120 | 150 | 120 | 390 | 344.77 |
| 2017-03-11 | Japanese Bench Press Championships | Single-ply | — | 140 | — | — | 122.28 |
| 2017-07-15 | Japanese Powerlifting Championships | Single-ply | 120 | 140 | 120 | 380 | 331.9 |
| 2017-09-16 | Japanese Masters Classic Powerlifting Championships | Raw | 85 | 122.5 | 125 | 332.5 | 287.86 |
| 2017-10-28 | Japanese Classic Bench Press Championships | Raw | — | 120 | — | — | 103.29 |
| 2018-01-27 | Japanese Bench Press Championships | Single-ply | — | 157.5 | — | — | 136.96 |
| 2018-10-13 | Japanese Bench Press Championships | Single-ply | — | 152.5 | — | — | 131.93 |
| 2019-01-19 | Japanese Classic Bench Press Championships | Raw | — | 117.5 | — | — | 101.8 |
| 2019-05-18 | World Bench Press Championships | Single-ply | — | 152.5 | — | — | 131.08 |
| 2019-10-26 | Japanese Bench Press Championships | Single-ply | — | 150 | — | — | 129.39 |
| 2020-11-21 | All Japan Bench Press Championships | Single-ply | — | 152.5 | — | — | 131.65 |
| 2022-02-12 | All Japan Bench Press Championships | Single-ply | — | 145 | — | — | 125.08 |
| 2023-10-08 | World Masters Classic & Equipped Powerlifting Championships | Raw | 75 | 100 | 115 | 290 | 251.07 |
| 2025-07-06 | Asian/Pacific/African Classic & Equipped Championships | Single-ply | 105 | — | 100 | — | — |
Hiroyuki Isagawa's career best to date is 650 kg, set in 2002 at age 48. Their total grew 72.5 kg over 20.6 years between their first meet and that mark (~3.5 kg/year). Career variance was 55% squat-driven.
Career-best meet: Japanese Juniors & Masters Nationals · JPA
vs Single-ply · 60 kg class · masters-2 · drug-tested