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Corrigendum for Spanjaard et al., J Appl Physiol 102 (4) 1618-1623.
J Appl Physiol 104: 1857-1859, 2008; doi:10.1152/japplphysiol.zdg-7985-corr.2008
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CORRIGENDUM

Corrigendum

Vol. 102, April 2007Spanjaard M, Reeves ND, van Dieën JH, Baltzopoulos V, Maganaris CN. Gastrocnemius muscle fascicle behavior during stair negotiation in humans. J Appl Physiol 102: 1618–1623, 2007. First published December 21, 2006; doi:10.1152/japplphysiol.00353.2006. An error occurred in the calculation of the musculotendon complex (MTC) length change for both stair ascent and descent presented in Figs. 3 and 4 and in Tables 1 and 2. As a consequence, the calculated tendon length change is also incorrect. The error does not change the discussion and the conclusions made, except for one point: The energy stored in the tendon after the touch-down during stair descent is not all absorbed by the lengthening fascicles (as was originally concluded). Some of the energy appears to be used for plantarflexing the ankle joint during lift-off. The corrected figures and tables are shown below.


Figure 3
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  		Fig. 3. A: mean changes in GM muscle fascicle length (thin line), musculotendon complex length (dashed line), and tendon length (thick line) during ascent (n = 10). SD of the changes in GM muscle fascicle length is shown by error bars. Values are relative to the reference position (standing still). Percentage of stride length is shown on the x-axis, beginning with touch-down of the left (analyzed) leg. B: mean ankle (thin line) and knee (thick line) joint angles during the same stride cycle (n = 10). C: mean ankle (thin line) and knee (thick line) power values during the same stride cycle (n = 10). D: mean ankle (thin line) and knee (thick line) moment values during the same stride cycle (n = 10). E: mean EMG of the GM muscle (n = 9) during the same stride cycle, normalized to the maximum value (EMGmax) reached during this stride cycle. EMG data from 1 subject are missing because offline analysis showed that the acquisition system failed during that trial. For clarity, error bars are pointing in 1 direction.

 

Figure 4
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  		Fig. 4. A: mean changes in GM muscle fascicle length (thin line), musculotendon complex length (dashed line), and tendon length (thick line) during descent. SD of the changes in GM muscle fascicle length is shown by error bars. Values are relative to the reference position (standing still). Percentage of stride length is shown on the x-axis, beginning with touch-down of the left (analyzed) leg. B: mean ankle (thin line) and knee (thick line) joint angles during the same stride cycle. C: mean ankle (thin line) and knee (thick line) power values during the same stride cycle. D: mean ankle (thin line) and knee (thick line) moment values during the same stride cycle. E: mean EMG of the GM muscle during the same stride cycle, normalized to the maximum value (EMGmax) reached during this stride cycle. For clarity, error bars are pointing in 1 direction (n = 10).

 

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  		Table 1. Gastrocnemius muscle fascicle length during stair ascent

 

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  		Table 2. Gastrocnemius muscle fascicle length during stair descent

 





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