Abstract
This study aimed to analyze the acute mechanical, metabolic and EMG response to
five resistance exercise protocols (REP) in the full squat (SQ) exercise
performed with two velocity conditions: maximal intended velocity (MaxV) vs.
half-maximal velocity (HalfV). Eleven resistance-trained men performed 10 REP (5
with each velocity conditions) in random order (72–96 h apart).
The REP consisted of three sets of 8–3 repetitions against
45–65% 1RM. The percent change in countermovement jump (CMJ)
height, velocity attained with the load that elicited a
~1.00 m·s−1 (V1-load), surface
EMG variables and blood lactate concentration were assessed pre- vs.
post-exercise protocols. MaxV resulted in greater percent changes (Δ:
12–25%) and intra-condition effect sizes (ES: 0.76–4.84)
in loss of V1-load and CMJ height compared to HalfV (Δ:
10–16%; ES: 0.65–3.90) following all REP. In addition,
MaxV showed higher post-exercise lactate concentration than HalfV (ES:
0.46–0.83; p<0.05). For EMG variables, only the Dimitrov index
resulted in relevant changes after each REP, with MaxV showing greater magnitude
of changes (23–38%) than HalfV (12–25%) across
all REP. These results suggest that voluntary movement velocity is a key aspect
to consider since it clearly determines the overall training intensity during
resistance exercise.
Key words
maximal intended velocity - resistance training - degree of fatigue - metabolic stress
- neural response
