The hormonal response to free/machine resistance exercise

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galapogos
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The hormonal response to free/machine resistance exercise

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The acute hormonal response to free weight and machine weight resistance exercise

Resistance exercise can acutely increase concentrations of circulating neuroendocrine factors, but the effect of mode on this response is not established. The purpose of this study was to examine the effect of resistance exercise selection on the acute hormonal response using similar lower-body multi-joint movement free weight and machine weight exercises. Ten resistance trained men (25±3 yr, 179±7 cm, 84.2±10.5 kg) completed 6 sets of 10 repetitions of squat or leg press at the same relative intensity separated by one week. Blood samples were collected before (PRE), immediately after (IP), and 15 (P15) and 30 min (P30) after exercise and analyzed for testosterone (T), growth hormone (GH), and cortisol (C) concentrations. Exercise increased (p<0.05) T and GH at IP but the concentrations at IP were greater for the squat (T: 31.4±10.3 nmol•L; GH: 9.5±7.3 μg•L) than for the leg press (T: 26.9±7.8 nmol•L; GH: 2.8±3.2 μg•L). At P15 and P30, GH was greater for the squat (P15: 12.3±8.9 μg•L; P30: 12.0±8.9 μg•L) than for the leg press (P15: 4.8±3.4 μg•L; P30: 5.4±4.1 μg•L). C was increased after exercise and was greater for the squat than for the leg press. Although total work (external load and body mass moved) was greater for the squat than for the leg press, rating of perceived exertion did not differ between modes. Free weight exercises appear to induce greater hormonal responses to resistance exercise than machine weight exercises utilizing similar lower-body multi-joint movements and primary movers.

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