Purpose:
The goal of the present study was to assess the effects of fatigue on throwing and Upper Quarter Y Balance Test (YBT-UQ) performance in male adolescent handball players. We hypothesized that throwing and YBT-UQ performance will be decreased in response to an upper-body fatigue-protocol.
Method:
All male participants (
N
= 24, age: 14.8 ± 0.7 yrs) were handball players of a regional youth selection team. A radar gun was used for the assessment of throwing velocity. The YBT-UQ was executed assessing medial, inferolateral and superolateral reach directions normalized to the upper limb length together with a composite score. Immediately following a fatigue protocol of different sets of push-ups until failure (i.e., not being able to perform 60% of the initial maximal amount of push-ups), throwing and YBT-UQ performance were assessed again.
Results:
Fatigue resulted in a significant decrease in throwing velocity (−3%,
p
= 0.022,
d
= 0.32). Concerning YBT-UQ, the fatigue protocol produced significant decreases for the superolateral reach direction (throwing arm reach: −5%,
p
= 0.017,
d
= 0.39; non-throwing arm reach: −10%,
p
< 0.001,
d
= 0.87) and the composite score (throwing arm reach: −2%,
p
= 0.026,
d
= 0.31; non-throwing arm reach: −4%,
p
= 0.001,
d
= 0.52) but not for the medial and the inferolateral reach directions.
Conclusions:
Fatigue was found to be an impairing factor for throwing performance and shoulder mobility and stability. Therefore, a lower level of fatigue and/or a higher tolerance of fatigue is desirable. Strength-endurance and mobility exercises especially for the shoulder girdle may be a valuable addition for the training routine of youth handball players.