Well-preserved bones recovered from an English shipwreck are shedding light on what life was like for the crew of the ill-fated Mary Rose 鈥 and offering surprising insights about changes in bone chemistry that could benefit modern medical research.
The Mary Rose was one of the largest warships of the Tudor navy during King Henry VIII鈥檚 reign until it sank on July 19, 1545, during a battle against the French. Hundreds of men were trapped on board when the ship sank in the Solent, a strait between the Isle of Wight and mainland Great Britain.
In 1982, the hull of the ship, its artifacts and the bones of 179 crew members were excavated from the Solent and brought to the surface. The hull and its collection of 19,000 items are on display at the in Portsmouth, England, and research is underway on the remains to uncover aspects of the identities and lifestyles of the crew members.
Researchers have analyzed the collarbones from 12 men between the ages of 13 and 40 who died on the Mary Rose to see how their tasks on the ship may have shaped the chemistry of their bones. The team also looked for telltale signs of aging and evidence of handedness, or which hand the crew members naturally favoured.
The results of the study were published Wednesday in the journal , and the findings could contribute to a better understanding of age-related changes in our bones.
鈥淎dvancing our knowledge of bone chemistry is crucial for understanding how our skeletons age and how medical conditions effect the bones,鈥 said lead study author Dr. Sheona Shankland, a research associate at the Lancaster Medical School at the U.K.鈥檚 Lancaster University.
鈥淯nderstanding these changes could allow us to be more informed about fracture risk and on the causes of conditions like osteoporosis and osteoarthritis, which are commonly experienced with aging.鈥
In 1510, one year after ascending the throne, Henry VIII signed off on a request for two new ships to be added to the royal fleet. The Mary Rose was one of them, and the flagship became the king鈥檚 favourite.
The ship saw action against the French in Brest, France, in 1512, and succumbed in its final battle during a large invasion by the French fleet in 1545. Despite the wealth of research conducted since the ship鈥檚 recovery, questions remain about what caused the vessel to sink.
鈥淩egardless of the cause, she rolled on to her starboard side and water entered through the open gunports,鈥 said study coauthor Dr. Alex Hildred, head of research and curator of ordnance at the Mary Rose Museum.
鈥淲ith few access points between decks, and a heavy net spread across the open upper deck, the 500 men were trapped on board,鈥 Hildred said. 鈥淭hose stationed on the uppermost decks within the bow and stern castles, or in the rigging, were the only survivors.鈥
Hildred helped supervise the underwater excavation, including recovering the largest concentration of human remains from the wreck, and she has facilitated research about the bones ever since.
Despite being underwater for hundreds of years, the remains were remarkably well-preserved because a layer of sediment that settled over the ship created an oxygen-free environment, said Shankland, who will begin as a lecturer at the University of Glasgow in Scotland in November.
鈥淭he nature of this environment means the remains of the sailors have not degraded the same way that would be expected in most archaeological discoveries, allowing us to reliably investigate the bone chemistry,鈥 she said.
Shankland was interested in the idea of studying clavicles, or collarbones, from the shipwreck because the bones showcase unique characteristics related to age, development and growth.
The S-shaped bones are some of the first to form in the human body but the last to fuse fully 鈥 typically between ages 22 to 25 in humans. They play a critical role in attaching upper limbs to the body, and clavicles are some of the most commonly fractured bones, said study coauthor Dr. Adam Taylor, director of the Clinical Anatomy Learning Centre and professor in anatomy at Lancaster University.
The research team used Raman spectroscopy, a non-destructive method that preserves valuable samples, to study the bones, Shankland said.
The method involves using light to uncover the chemistry of a sample. The team analyzed how light reacted with molecules within the bones, and changes in the colour of the light allowed the researchers to identify specific substances.
Bones are composed of a balance of minerals and proteins. The minerals provide bones with resistance, strength and rigidity, while protein gives them flexibility and resistance to fracture, Shankland said.
The analysis showed that the balance of protein and minerals changes with aging. The mineral content of the bones increases with age, and protein content decreases. The changes were most noticeable in the right collarbones, indicating that the crew members favored their right hands 鈥 but they may not have had a choice.
鈥淎s individuals from this time would have been forced to be right handed, as left handedness had negative associations in medieval England, we could assume this difference in the right side was due to handedness,鈥 Shankland said by email.
At the time, left-handedness was associated with witchcraft, so crew members would have relied on their right hands and put more stress on their right sides during repetitive tasks on the ship, Shankland said.
Understanding the relationship between handedness and impacts to the clavicle is crucial. When people fall, they usually put out their dominant hand to break the fall 鈥 which is one of the most common ways to fracture the clavicle, Shankland said.
鈥淭his suggests that handedness influences clavicle bone chemistry, offering an important modern consideration for fracture risk,鈥 Shankland said. 鈥淭hese results enhance our understanding of the lives of Tudor sailors, but also contribute to modern scientific investigation in the drive for a clearer understanding of changes in bone chemistry and potential links to aging-related skeletal diseases such as osteoarthritis.鈥
The study provides a new facet of information about the crew members of the Mary Rose and how their occupations in Tudor England shaped their bodies and bones, said Richard Madgwick, a professor in the School of History, Archeology and Religion at the U.K.鈥檚 Cardiff University. Madgwick was not involved in the current study but previously researched other aspects of the remains.
鈥淏iomechanical aspects of these strenuous, repeated tasks have long been understood, but the chemical variation and contrasting changes in mineral and protein components are much more poorly understood,鈥 Madgwick said by email. 鈥淭he study has ramifications well beyond the Mary Rose 鈥 its novel, high resolution method provides a new approach for gaining insights into human lifeways, occupations and the stresses endured in the past, crucially, without any destruction of the invaluable archeological remains.鈥
Each time researchers study the remains of the crew, they glean new insights, such as the of some of the crew members.
鈥淭he fact that this research has tangible benefits today, nearly 500 years after the ship sank, is both remarkable and humbling,鈥 Hildred said.
Next, Shankland wants to study the remains of the archers aboard the ship to see whether their spines bear any of the signs of the unique motions they performed. The archers used long bows, which required a huge amount of rotation of the spine when pulling back on the bowstring.
鈥淭his means one side of the spine is under more repeated stress in a predictable motion, so the changes across the spine wouldn鈥檛 be symmetrical,鈥 Shankland said. 鈥淚nvestigating the impact of this on the spine would further our understanding of bone chemistry changes with age, but also with stress from activity.鈥
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