Goi's Fitness Forum

Hormonal responses to three training protocols in rowing

The aim of this study was to examine the acute responses of serum growth hormone, testosterone, and cortisol to three training protocols in rowing. Six young rowers, members of the national team, carried out three frequently used protocols in rowing, i.e., an endurance, a moderate interval, and a resistance protocol, on separate days in a counterbalanced design. Blood samples were collected before, immediately after, and 4 h after exercise for the determination of growth hormone, testosterone, cortisol, and creatine kinase. All three protocols caused marked increases in growth hormone, the most spectacular being that immediately after the endurance protocol. The change in testosterone concentration immediately after the endurance protocol was significantly higher than the changes after the other two protocols. Cortisol concentration was significantly higher immediately after the endurance protocol than after the other two protocols, but remained relatively low in all cases, suggesting that these protocols did not considerably promote catabolism in muscle tissue. Based on these data, endurance training caused greater responses of the three hormones studied compared to interval or resistance training. In fact, resistance training (at intensities above 85% of 1RM) did not cause any significant changes in the three hormones. We therefore propose that evaluation of training programmes designed for elite athletes should include measurements of hormonal changes in order to ascertain that the programmes do cause the expected adaptations.

Interesting, although unfortunately there's no definition of the protocols they used for endurance and moderate interval. I checked the free preview but sadly no joy.

Considering how rowing works out though (say endurance is 25-30 strokes per min, e.g. you are squatting ~1/2 to 2/3 of BW, 30 times a min through a full ATG ROM), I would consider a typical endurance rowing workout to be moderate interval compared to say cycling at very light weights with a much higher cadence (75-95 RPM, so e.g. squatting not even with own body weight, 75+times/min), or running at a slow pace (80+RPM, although with much higher BW impact, albeit with musculature at strongest positions).

True, however rowing can't really be compared to squatting, different force curve, different movement, no eccentric, etc.

I was just surprised the "endurance" protocol elicited the most hormonal response.

I'm surprised too, so my postulate is that endurance in rowing is different in musculature modality to endurance in cycling, running etc, even thought the response from the energy systems may be similar (but not the same?).

*shrug*

Yeah, full body movements, much greater ROM might cause it to produce a greater hormonal response compared to running/cycling. However, it doesn't doesn't explain why the "endurance rowing" protocol beat the "interval rowing" protocol. Both are rowing. Weird...wish I had the full paper to see what's going on.