Sieta Posthumus (born 22 April 1936) is a retired Dutch freestyle swimmer who participated in the

1960 Summer Olympics The 1960 Summer Olympics ( it, Giochi Olimpici estivi del 1960), officially known as the Games of the XVII Olympiad ( it, Giochi della XVII Olimpiade) and commonly known as Rome 1960 ( it, Roma 1960), were an international multi-sport event held ...

in the 4×100 m freestyle relay. Her team was expected to compete for medals, but was disqualified in the preliminary round because she jumped in water while her team mate, Jopie Troost, had not yet completed her leg. During the warm up, Posthumus hit the wall of the pool with her head, and it was revealed later that she suffered a

concussion A concussion, also known as a mild traumatic brain injury (mTBI), is a head injury that temporarily affects brain functioning. Symptoms may include loss of consciousness (LOC); memory loss; headaches; difficulty with thinking, concentration, ...

. She retired from swimming six months after the Games.

References

1936 births Living people Swimmers at the 1960 Summer Olympics Olympic swimmers of the Netherlands Dutch female freestyle swimmers Sportspeople from Leeuwarden {{Netherlands-swimming-bio-stub