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Kinematics of swimming and thrust production during powerstroking bouts of the swim frenzy in green turtle hatchlings.

Booth DT - Biol Open (2014)

Bottom Line: Instead differences in swimming speed were caused by a combination of varying flipper amplitude and the proportion of time spent powerstroking.Two distinct thrust production patterns were identified, monophasic in which a single peak in thrust was recorded during the later stages of the downstroke, and biphasic in which a small peak in thrust was recorded at the very end of the upstroke and this followed by a large peak in thrust during the later stages of the downstroke.The biphasic cycle occurs in ∼20% of hatchlings when they first started swimming, but disappeared after one to two hours of swimming.

View Article: PubMed Central - PubMed

Affiliation: School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia d.booth@uq.edu.au.

No MeSH data available.


Related in: MedlinePlus

Plots of relationships between front flipper amplitude and peak force and angular velocity and peak force production during the downstroke phase of a powerstroke in green turtle hatchlings.(A) Monophasic flipper amplitude y  =  4.63x − 265, R2  =  0.71, n  =  37, P < 0.001. (B) Monophasic flipper angular velocity y  =  0.58x − 91.8, R2  =  0.72, n  =  37, P < 0.001. (C) Biphasic flipper amplitude y  =  2.71x − 44.1, R2  =  0.71, n  =  40, P < 0.001. (D) Biphasic flipper angular velocity y  =  0.45x + 16.7, R2  =  0.72, n  =  40, P < 0.001.
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f06: Plots of relationships between front flipper amplitude and peak force and angular velocity and peak force production during the downstroke phase of a powerstroke in green turtle hatchlings.(A) Monophasic flipper amplitude y  =  4.63x − 265, R2  =  0.71, n  =  37, P < 0.001. (B) Monophasic flipper angular velocity y  =  0.58x − 91.8, R2  =  0.72, n  =  37, P < 0.001. (C) Biphasic flipper amplitude y  =  2.71x − 44.1, R2  =  0.71, n  =  40, P < 0.001. (D) Biphasic flipper angular velocity y  =  0.45x + 16.7, R2  =  0.72, n  =  40, P < 0.001.

Mentions: For the hatchling exhibiting monophasic force production, the downstroke time was shorter than the upstroke time during the 1 min and 2 h swimming period, but downstroke and upstroke times were similar during the 16 h swimming period (Table 1). For the hatchling exhibiting biphasic force production, the downstroke time was shorter than the upstroke time during the 1 min swimming period, but downstroke and upstroke times were similar during the 1 h and 16 h swimming periods (Table 1). There was a strong correlation between the force produced during the downstroke and both the amplitude and angular velocity of the flippers during the downstroke in the hatchling exhibiting monophasic and biphasic force production (Fig. 6). Peak force production (Figs 3, 4), flipper amplitude and flipper angular velocity (Fig. 6) decreased as swim time increased.


Kinematics of swimming and thrust production during powerstroking bouts of the swim frenzy in green turtle hatchlings.

Booth DT - Biol Open (2014)

Plots of relationships between front flipper amplitude and peak force and angular velocity and peak force production during the downstroke phase of a powerstroke in green turtle hatchlings.(A) Monophasic flipper amplitude y  =  4.63x − 265, R2  =  0.71, n  =  37, P < 0.001. (B) Monophasic flipper angular velocity y  =  0.58x − 91.8, R2  =  0.72, n  =  37, P < 0.001. (C) Biphasic flipper amplitude y  =  2.71x − 44.1, R2  =  0.71, n  =  40, P < 0.001. (D) Biphasic flipper angular velocity y  =  0.45x + 16.7, R2  =  0.72, n  =  40, P < 0.001.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4197437&req=5

f06: Plots of relationships between front flipper amplitude and peak force and angular velocity and peak force production during the downstroke phase of a powerstroke in green turtle hatchlings.(A) Monophasic flipper amplitude y  =  4.63x − 265, R2  =  0.71, n  =  37, P < 0.001. (B) Monophasic flipper angular velocity y  =  0.58x − 91.8, R2  =  0.72, n  =  37, P < 0.001. (C) Biphasic flipper amplitude y  =  2.71x − 44.1, R2  =  0.71, n  =  40, P < 0.001. (D) Biphasic flipper angular velocity y  =  0.45x + 16.7, R2  =  0.72, n  =  40, P < 0.001.
Mentions: For the hatchling exhibiting monophasic force production, the downstroke time was shorter than the upstroke time during the 1 min and 2 h swimming period, but downstroke and upstroke times were similar during the 16 h swimming period (Table 1). For the hatchling exhibiting biphasic force production, the downstroke time was shorter than the upstroke time during the 1 min swimming period, but downstroke and upstroke times were similar during the 1 h and 16 h swimming periods (Table 1). There was a strong correlation between the force produced during the downstroke and both the amplitude and angular velocity of the flippers during the downstroke in the hatchling exhibiting monophasic and biphasic force production (Fig. 6). Peak force production (Figs 3, 4), flipper amplitude and flipper angular velocity (Fig. 6) decreased as swim time increased.

Bottom Line: Instead differences in swimming speed were caused by a combination of varying flipper amplitude and the proportion of time spent powerstroking.Two distinct thrust production patterns were identified, monophasic in which a single peak in thrust was recorded during the later stages of the downstroke, and biphasic in which a small peak in thrust was recorded at the very end of the upstroke and this followed by a large peak in thrust during the later stages of the downstroke.The biphasic cycle occurs in ∼20% of hatchlings when they first started swimming, but disappeared after one to two hours of swimming.

View Article: PubMed Central - PubMed

Affiliation: School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia d.booth@uq.edu.au.

No MeSH data available.


Related in: MedlinePlus