Skip Navigation LinksHome > March 2014 - Volume 46 - Issue 3 > Hemodynamic Response to Upright Resistance Exercise: Effect...
Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0b013e3182a7980f
Basic Sciences

Hemodynamic Response to Upright Resistance Exercise: Effect of Load and Repetition

PERRY, BLAKE G.1; SCHLADER, ZACHARY J.1; BARNES, MATTHEW J.1; COCHRANE, DARRYL J.1; LUCAS, SAMUEL J. E.2,3; MüNDEL, TOBY1

Collapse Box

Abstract

Introduction/Purpose: Upright resistance exercise causes large transient fluctuations in blood pressure during and immediately after the performance. We examined the effect of resistance load and the number of repetitions on the middle cerebral artery blood flow velocity (MCAv) response during and after upright squatting exercise.

Methods: Healthy males (n = 12; mean ± SD: 26 ± 5 yr) completed 30%, 60%, and 90% of their six-repetition maximum load, completing two and six repetitions of these loads during two visits (order randomized). Beat-to-beat MCAv, blood pressure, and continuous end-tidal PCO2 during exercise, at nadir, and during recovery are reported as the change from preexercise standing baseline.

Results: During exercise, MCAvmean increased 31% ± 16% (P < 0.001) across all loads (P = 0.74) and repetitions (P = 0.89), whereas mean arterial pressure (MAP) increased (all P < 0.05) as load and repetitions increased (e.g., 122 ± 9 (two repetitions) vs 135 ± 11 mm Hg (six repetitions) and 128 ± 13 vs 143 ± 14 mm Hg, at 30% and 60%, respectively). Within the six-repetition sets, peak MCAvmean remained unchanged across the set (P = 0.61), whereas MAP increased (P = 0.003). The 90% load produced the lowest MCAvmean nadir (pooled means, −18 ± 6 vs −10 ± 7 cm·s−1, P < 0.001 vs 30%) and MAP nadir (−34 ± 7 and −43 ± 5 mm Hg, for two and six repetitions, respectively; P < 0.001) after exercise. Postexercise MCAvmean reductions occurred via a selective, load-dependent (P < 0.001) decrease in diastolic MCAv. MCAvmean remained below baseline for the longest period after the 90% six-repetition set (10 s postexercise, P < 0.01) and took the longest to recover (14.8 ± 6.9 s, P = 0.002).

Conclusion: These data indicate that higher relative loads produce a greater postexercise hypotension and result in a proportionate reduction in MCAvmean.

© 2014 American College of Sports Medicine

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us