Key result
Sudden strenuous exercise without warm-up fails to alter LV dimensions or function versus warm-up.
Why the study?
Does sudden strenuous exercise without warm-up reduce left ventricular function compared to exercise with warm-up in healthy untrained males?
Does sudden strenuous exercise without warm-up reduce left ventricular function compared to exercise with warm-up in healthy untrained males?
Sudden strenuous exercise without warm-up does not cause transient global left ventricular dysfunction in healthy untrained males, contradicting previous findings.
Answers are grounded in this paper and cite their sources.
No indication warm-up prevents LV changes during sudden exercise in untrained males; hypothesis-generating and requires confirmation in broader populations.
We studied the response in left ventricular (LV) internal dimensions and posterior wall thickness during the performance of sudden strenuous exercise without warm-up (SSE) and sudden strenuous exercise with warm-up (SSEw) in 15 healthy, untrained college-aged males (26 +/- 5.0 yr). Measurements of left ventricular end-diastolic dimension (LVEDD), left ventricular end-systolic dimension (LVESD), stroke dimension (SD = LVEDD-LVESD), fractional shortening (FS = SD/EDD) and posterior wall thickness (PWT) were obtained from continuous 2-D targeted on M-mode echocardiography. Continuous EKG and blood pressure were obtained at rest and during the final 10 s of SSE (30 s of upright leg cycle ergometry of 400 W at 80 rpm). SSEw was preceded by warm-up exercise (6 min of graded leg cycle exercise of 2-min stages initial load 30 W, increasing in 30-W increments at 60 rpm, followed immediately by SSE). Our findings revealed that there were no significant differences in the LV internal dimensions (LVEDD, LVESD, FS, PWT), HR max, RPP max, ECG, and MAP max between SSE and SSEw. Sudden strenuous exercise without warm-up is not associated with a reduced LV function. The results of this study are contradictory to previous findings that have suggested that SSE is associated with transient global left ventricular (LV) dysfunction.
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Chesler et al. (1997) studied Healthy (n=15). Sudden strenuous exercise without warm-up (SSE) vs. Sudden strenuous exercise with warm-up (SSEw) was evaluated on Left ventricular internal dimensions (LVEDD, LVESD, FS, PWT), HR max, RPP max, ECG, and MAP max. Sudden strenuous exercise without warm-up did not significantly alter left ventricular internal dimensions or function compared to exercise with warm-up.
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