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• W2808043255 abstract "Many strength and conditioning programs incorporate high power speed squats as part of the training regimen. The training specificity principle suggests that high power speed squats contribute to high power performance during sports performance, most likely due to the recruitment strategies required. What are not clear are the acute endocrine responses that result from this type of exercise. PURPOSE: To determine the acute endocrine responses to maximal velocity barbell squats at three different external loads. METHODS: Seven healthy recreationally weight trained men (X ± SE; age = 21.4 ± 0.6 yrs, hgt. = 1.83 ± 0.02 m, wgt. = 92.0 ± 3.7 kg, squat 1 RM = 152.7 ± 13.4 kg) completed each of three speed squat protocols in randomized order on non-consecutive days. The three lifting protocols were as follows; 5 × 3 at 90% 1 RM (heavy), 5 × 5 at 70% 1 RM (medium) and 5 × 10 at 30% 1 RM (light). Blood samples obtained from an antecubital vein pre-exercise (Pre) and 5 min. post-exercise (Post) were analyzed for lactate (HLa), total testosterone (Tes), cortisol (Cort) and immunoreactive growth hormone (GH). Data were analyzed using 2 x 3 (time × load) or 1 × 3 (3 loads) repeated measures ANOVAs (*p<0.05 vs. pre, †p<0.05 vs. light load). Data are reported as X ± SE. RESULTS: Mean power for all repetitions at each load were; heavy = 1,071.7 ± 57.6 W†, medium = 1,244.2 ± 91.0 W and light = 1,472.5 ± 68.3 W. Mean volume-loads (reps x wgt.) for each protocol were; heavy = 2,061.6 kg, medium = 2,670.6 kg and light = 2293.2 kg. Discussion: Cort and GH exhibited a significant increase due to lifting at all loads, although the increases were modest. Increases in Tes have been associated with high relative intensity resistance exercise, but this was not apparent in the present study. When compared to previously reported acute endocrine responses to resistance exercise, it is likely that the volume-load for any of these protocols was not high enough to elicit much of an increase. The small increases in HLa indicate the modest metabolic stress these lifting protocols imposed. Although this protocol was not a long-term training study, these data suggest that performance responses and adaptations to high velocity squats using volume-loads < 2,700 kg such as used in this study are only modestly manifested via the endocrine system. Practical Applications: Small volumes of high velocity squats at any relative intensity exhibit only modest or no increases in several anabolic-catabolic hormones, and may not be optimal for creating an anabolic endocrine response. This project funded by NFGRF #2302180." @default.
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• W2808043255 date "2011-03-01" @default.
• W2808043255 modified "2023-10-16" @default.
• W2808043255 title "Acute Endocrine Responses to Maximal Velocity Barbell Squats with Three Different Loads" @default.
• W2808043255 doi "https://doi.org/10.1097/01.jsc.0000395724.29988.94" @default.
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