TY - JOUR
T1 - The effect of countermovement on force production capacity depends on extension velocity: A study of alpine skiers and sprinters
AU - Cross, M.R.
AU - Riviere, J.R.
AU - Van Hooren, B.
AU - Coulmy, N.
AU - Jimenez-Reyes, P.
AU - Morin, J.B.
AU - Samozino, P.
PY - 2021/8/18
Y1 - 2021/8/18
N2 - In jumping, countermovement increases net propulsive force and improves performance. We aimed to test whether this countermovement effect is velocity specific and examine the degree to which this varies between athletes, sports or performance levels. Force-velocity profiles were compiled in high-level skiers (N= 23) and sprinters (N= 30), with their performance represented in their overall world ranking and season-best 100 m time, respectively. Different ratios between force-velocity variables were computed from squat and countermovement jumps (smaller = less effect): jump height (CRh ), maximum power (CRP ), force (CRF ), and velocity (CRv ). Countermovement effect differed per velocity (inverse relationship between CRF and CRv, r(s) = -0.74, p< .001), and variation force-velocity profiles with countermovement. Skiers exhibited smaller CRF (r(rb) = -0.675, p< .001), sprinters smaller CRv (r(rb) = 0.426, p= .008), and "moderate" velocity conditions did not differentiate groups (CRP or CRh, p> .05). 33% of the variance in skiers' performance level was explained by greater maximum force and a lower CRF (i.e., high explosiveness at low-velocities without countermovement), without an association for sprinters. Countermovement effect appears specific to movement velocity, sport and athlete level. Consequently, we advise sports-specific assessment, and potentially training to reduce the countermovement effect per the relevant velocity.
AB - In jumping, countermovement increases net propulsive force and improves performance. We aimed to test whether this countermovement effect is velocity specific and examine the degree to which this varies between athletes, sports or performance levels. Force-velocity profiles were compiled in high-level skiers (N= 23) and sprinters (N= 30), with their performance represented in their overall world ranking and season-best 100 m time, respectively. Different ratios between force-velocity variables were computed from squat and countermovement jumps (smaller = less effect): jump height (CRh ), maximum power (CRP ), force (CRF ), and velocity (CRv ). Countermovement effect differed per velocity (inverse relationship between CRF and CRv, r(s) = -0.74, p< .001), and variation force-velocity profiles with countermovement. Skiers exhibited smaller CRF (r(rb) = -0.675, p< .001), sprinters smaller CRv (r(rb) = 0.426, p= .008), and "moderate" velocity conditions did not differentiate groups (CRP or CRh, p> .05). 33% of the variance in skiers' performance level was explained by greater maximum force and a lower CRF (i.e., high explosiveness at low-velocities without countermovement), without an association for sprinters. Countermovement effect appears specific to movement velocity, sport and athlete level. Consequently, we advise sports-specific assessment, and potentially training to reduce the countermovement effect per the relevant velocity.
KW - Power
KW - jumping
KW - force-velocity
KW - neuromuscular
KW - alpine skiing
U2 - 10.1080/02640414.2021.1906523
DO - 10.1080/02640414.2021.1906523
M3 - Article
C2 - 33792497
SN - 0264-0414
VL - 39
SP - 1882
EP - 1892
JO - Journal of Sports Sciences
JF - Journal of Sports Sciences
IS - 16
ER -