Of the few studies examining negative consequences associated with workloads , increases in training load led to increases in injury rates , while longer training duration was associated with a greater incidence of illness .
Conclusion The combined capacity for adolescent males to grow , train and improve physical performance highlights and underscores an exciting responsiveness to training in the football environment .
However , the capacity to train has some established barriers for adolescents experiencing high workloads , which could also result in negative consequences .
Background The expectation that training enhances performance is well explored in professional sport .
However , the additional challenges of physical and cognitive maturation may require careful consideration when determining workloads to enhance performance in adolescents .
Objective The objective of this study was to determine the state of knowledge on the relationship between workloads , physical performance , injury and /or illness in adolescent male football players .
Can we detect non-functional overreaching in young elite soccer players and middle-long distance runners using field performance tests?
Objective To study whether field performance tests can make a valid distinction between non-functionally overreaching ( NFO ) athletes and control athletes . Design Monthly field performance tests were used to determine a performance decrement ( PD ) throughout a season . Athletes with a minimum of 1 month PD were compared with control athletes without a PD on mood characteristics and resting levels of stress hormones . Setting Sporting field and sports medical laboratory . Participants 129 young elite athletes , 77 soccer players and 52 middle-long distance runners were followed prospect ively during the 2006–2007 season . Fifteen of them were invited to the laboratory . Eight athletes showed a performance decrease lasting longer than 1 month , and seven athletes without a performance decrease acted as their controls . Main outcome measures Performance changes over time were measured using field tests .  Profile of Mood States and resting levels of adrenocorticotrophic hormone ( ACTH ) and cortisol in blood were measured in the laboratory . Results PD athletes showed several symptoms typical of the non-functional state of overreaching ( OR ) . The PD group scored higher on depression and anger than controls . They also showed a specific pattern of correlations between negative mood subscales ( tension , fatigue and depression ) , which was absent in controls . ACTH levels at rest were similar , but lower cortisol levels in PD athletes pointed at a blunted cortisol response . Cortisol levels were decoupled from ACTH levels only in PD athletes . Conclusions Implementing performance-related criteria in field tests can help coaches and sports physicians to distinguish NFO athletes from athletes with balanced workload and recovery
Of the few studies examining negative consequences associated with workloads , increases in training load led to increases in injury rates , while longer training duration was associated with a greater incidence of illness .
Conclusion The combined capacity for adolescent males to grow , train and improve physical performance highlights and underscores an exciting responsiveness to training in the football environment .
However , the capacity to train has some established barriers for adolescents experiencing high workloads , which could also result in negative consequences .
Background The expectation that training enhances performance is well explored in professional sport .
However , the additional challenges of physical and cognitive maturation may require careful consideration when determining workloads to enhance performance in adolescents .
Objective The objective of this study was to determine the state of knowledge on the relationship between workloads , physical performance , injury and /or illness in adolescent male football players .