Rowing Zone Pace Tool for Irish Crews

UT2: steady aerobic, the volume floor

Sits 12 to 16 seconds outside your 2k pace per 500, rated 18 to 20, heart rate around 65 to 75 percent of max. Conversational by design: if you cannot finish a sentence with the rower next to you on Lough Ree, the boat is going too hard. Every serious Irish programme parks the bulk of its mileage here, because UT2 is the band that builds the mitochondrial machinery the other zones run on. A weekend long piece of 75 to 90 minutes continuous, or 4 by 20 minutes on the erg with two minutes easy between, is the standard winter shape. The split should not tighten across reps. If it does, the next session is also compromised.

UT1: firm aerobic, the next gear

Sits 6 to 10 seconds outside the 2k at 22 to 24, heart rate 75 to 83 percent of max. Conversation contracts to short phrases. This is the band Rowing Ireland coach education leans into during the build phase ahead of Irish Champs, and it is the practical fallback for masters athletes at Commercial or Garda whose work week will not stretch to 90 minute UT2 blocks. Sessions like 4 by 10 minutes with two minutes rest, 3 by 20 with three rest, or 2 by 30 with four rest sit cleanly here. The point of UT1 is folding UT2-equivalent stimulus into a shorter window without tipping into threshold.

AT: anaerobic threshold, the rate-limiting gear

Sits 3 to 5 seconds outside the 2k at 26 to 28, heart rate 85 to 90 percent of max, blood lactate hovering at the inflection point. The honesty test for AT is whether rep six holds the same split as rep one. If it does not, the prescription was too sharp. Sessions like 4 by 10 minutes with four minutes rest, 6 by 4 minutes with two minutes rest, and 8 by 4 minutes with two minutes rest are the bread and butter. AT is the most underdosed zone in Irish club rowing: athletes who plateau on 2k usually need more AT volume, not more TR or AN, because the threshold gear is what shifts the whole pace curve down rather than just sharpening the top end.

TR: transport, the race pace itself

Olympic 2k pace, 30 to 34 strokes per minute, heart rate above 90 percent of max from rep two onwards. Sessions sit at race distance fractions: 6 by 500m with four minutes rest, 4 by 750m with five rest, 3 by 1000m with six rest, 2 by 1500m with eight rest. The rest interval is part of the prescription, not a footnote. Too short and rep three degrades and you finish the session below race pace, training the wrong physiology. Too long and the system you recruit shifts toward creatine-phosphate recovery rather than 2k-specific lactate tolerance. Treat the rest spec as load-bearing.

AN: anaerobic, the sharpening band

Sits 3 to 5 seconds inside the 2k at 36 plus, used in small, sharp doses. Sessions like 8 by 250m with three minutes rest, 10 by one minute with two minutes rest, or 16 rounds of 30 seconds on with 30 seconds off. AN is fragile. If the central nervous system is fatigued from a heavy AT block earlier in the week, the AN session will not produce the intended adaptation and the session is wasted gym time. Race-prep blocks for Inniscarra typically taper AN volume in the final fortnight rather than ramping it up, because freshness matters more than fitness gains by that point.

How a working week stitches together

A typical base-phase week for a senior Irish club rower or IURC athlete might split roughly 60 percent UT2, 25 percent UT1, 10 percent AT and 5 percent TR or AN. Race blocks in the four weeks before Irish Champs shift weight toward UT1, AT and TR with UT2 still owning the weekend long piece. Junior 16 and Junior 18 squads almost always run heavier UT2, often 70 to 80 percent, because the aerobic engine in younger athletes scales most reliably with patient low-intensity volume. The data-driven training guide walks through how a coach can track zone distribution across a season rather than guess at it in March.