Acute hemodynamic and cardiovascular responses following resistance exercise to voluntary exhaustion. Effects of different loadings and exercise durations.
BACKGROUND
The aim of this study was to compare the acute hemodynamic and cardiovascular responses of high load/low repetition resistance training (RT) to low load/high repetition RT.


METHODS
Thirteen healthy men performed four sets of 4 repetition maximum (RM) and 20RM leg-extensions without breath-holding. The RT was conducted in a randomized order and with 48 hours between bouts. Non-invasive beat-to-beat systolic and diastolic blood-pressure (SBP/DBP) was measured on the finger, while non-invasive cardiac output (CO) was assessed beat-to-beat by impedance-cardiography.


RESULTS
Mean±SD resting SBP/DBP and CO were 126±14/73±9 mmHg and 5.6±9 L min-1, respectively. Exercise SBP/DBP values increased to 154±22/99 ±18 and 203±33/126±19 mmHg following 4RM and 20RM RT, respectively (compared to rest, all; P<0.001), and 20RM SBP/DBP values were higher than 4RM values (both, P<0.001). The SBP increased from the first to the fourth set of exercise following the 20RM load (P<0.01), but not so for the 4RM load. Exercise SBP/DBP values following the 4th rep of 20RM exercise (154±18/91±14), was similar to the 4RM values, but different to the 20th rep of the 20 RM loading (both; P<0.001). CO increased to 10.8±2.6 and 13.9±2.2 L min-1, following 4RM and 20RM RT, respectively (compared to rest, both; P<0.001) and 20RM CO was higher than 4RM CO (P<0.01).


CONCLUSIONS
20RM RT resulted in higher blood-pressure than 4RM RT when performed to voluntary exhaustion. Differences in hemodynamic responses seems to be related to training duration and not to difference in loading.
Department of Occupational Therapy, Prosthetics and Orthotics, Faculty of Health Sciences, Oslo and Akershus University College, Oslo, Norway - terje.gjovaag@hioa.no.
Terje
T
Gjovaag
Asmund K
AK
Hjelmeland
Jonas B
JB
Oygard
Harald
H
Vikne
Peyman
P
Mirtaheri
D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology*; D015444:Exercise / Q000502:physiology; D005221:Fatigue; D006339:Heart Rate / Q000502:physiology*; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D006973:Hypertension; D008297:Male; D055070:Resistance Training / Q000379:methods*; D012146:Rest / Q000502:physiology; D013599:Systole