Muscle in Variable Gravity: "I Do Not Know Where I Am, But I Know What to Do"

Publikationen: Beitrag in FachzeitschriftZeitschriftenaufsätzeForschungBegutachtung

Standard

Muscle in Variable Gravity: "I Do Not Know Where I Am, But I Know What to Do". / Monti, Elena; Waldvogel, Janice; Ritzmann, Ramona et al.

in: Frontiers in Physiology, Jahrgang 12, 714655, 04.08.2021, S. 1-19.

Publikationen: Beitrag in FachzeitschriftZeitschriftenaufsätzeForschungBegutachtung

Harvard

Monti, E, Waldvogel, J, Ritzmann, R, Freyler, K, Albracht, K, Helm, M, De Cesare, N, Pavan, P, Reggiani, C, Gollhofer, A & Narici, MV 2021, 'Muscle in Variable Gravity: "I Do Not Know Where I Am, But I Know What to Do"', Frontiers in Physiology, Jg. 12, 714655, S. 1-19. https://doi.org/10.3389/fphys.2021.714655

APA

Monti, E., Waldvogel, J., Ritzmann, R., Freyler, K., Albracht, K., Helm, M., De Cesare, N., Pavan, P., Reggiani, C., Gollhofer, A., & Narici, M. V. (2021). Muscle in Variable Gravity: "I Do Not Know Where I Am, But I Know What to Do". Frontiers in Physiology, 12, 1-19. [714655]. https://doi.org/10.3389/fphys.2021.714655

Vancouver

Bibtex

@article{d7b45d25729f4405b65d71d6f6532992,
title = "Muscle in Variable Gravity: {"}I Do Not Know Where I Am, But I Know What to Do{"}",
abstract = "Purpose: Fascicle and sarcomere lengths are important predictors of muscle mechanical performance. However, their regulation during stretch-shortening cycle (SSC) activities in usual and challenging conditions is poorly understood. In this study, we aimed to investigate muscle fascicle and sarcomere behavior during drop jumps (a common SSC activity) in conditions of variable gravity. Methods: Fifteen volunteers performed repeated drop jumps in 1 g, hypo-gravity (0 to 1 g), and hyper-gravity (1 to 2 g) during a parabolic flight. Gastrocnemius medialis (GM) electromyographic activity and fascicle length (Lf) were measured at drop-off, ground contact (GC), minimum ankle joint angle (MAJ), and push-off. GM sarcomere number was estimated by dividing Lf, measured by ultrasound at rest, by published data on GM sarcomere length, and measured in vivo at the same joint angle. Changes in sarcomere length were estimated by dividing GM Lf in each jump phase by sarcomere number calculated individually. The sarcomere force-generating capacity in each jump phase was estimated from the sarcomere length-tension relationship previously reported in the literature. Results: The results showed that, regardless of the gravity level, GM sarcomeres operated in the ascending portion of their length-tension relationship in all the jump phases. Interestingly, although in hypo-gravity and hyper-gravity during the braking phase (GC-MAJ) GM fascicles and sarcomeres experienced a stretch (as opposed to the quasi-isometric behavior in 1 g), at MAJ they reached similar lengths as in 1 g, allowing sarcomeres to develop about the 70% of their maximum force. Conclusion: The observed fascicle behavior during drop jumping seems useful for anchoring the tendon, enabling storage of elastic energy and its release in the subsequent push-off phase for effectively re-bouncing in all gravity levels, suggesting that an innate neuromuscular wisdom enables to perform SSC movements also in challenging conditions.",
keywords = "parabolic flight, drop jump, hypo-gravity, hyper-gravity, sarcomere operating length",
author = "Elena Monti and Janice Waldvogel and Ramona Ritzmann and Kathrin Freyler and Kirsten Albracht and Michael Helm and {De Cesare}, Niccol{\`o} and Piero Pavan and Carlo Reggiani and Albert Gollhofer and Narici, {Marco Vincenzo}",
note = "Copyright {\textcopyright} 2021 Monti, Waldvogel, Ritzmann, Freyler, Albracht, Helm, De Cesare, Pavan, Reggiani, Gollhofer and Narici.",
year = "2021",
month = aug,
day = "4",
doi = "10.3389/fphys.2021.714655",
language = "English",
volume = "12",
pages = "1--19",
journal = "Frontiers in Physiology",
issn = "1664-042X",
publisher = "Frontiers Media S.A.",

}

RIS

TY - JOUR

T1 - Muscle in Variable Gravity: "I Do Not Know Where I Am, But I Know What to Do"

AU - Monti, Elena

AU - Waldvogel, Janice

AU - Ritzmann, Ramona

AU - Freyler, Kathrin

AU - Albracht, Kirsten

AU - Helm, Michael

AU - De Cesare, Niccolò

AU - Pavan, Piero

AU - Reggiani, Carlo

AU - Gollhofer, Albert

AU - Narici, Marco Vincenzo

N1 - Copyright © 2021 Monti, Waldvogel, Ritzmann, Freyler, Albracht, Helm, De Cesare, Pavan, Reggiani, Gollhofer and Narici.

PY - 2021/8/4

Y1 - 2021/8/4

N2 - Purpose: Fascicle and sarcomere lengths are important predictors of muscle mechanical performance. However, their regulation during stretch-shortening cycle (SSC) activities in usual and challenging conditions is poorly understood. In this study, we aimed to investigate muscle fascicle and sarcomere behavior during drop jumps (a common SSC activity) in conditions of variable gravity. Methods: Fifteen volunteers performed repeated drop jumps in 1 g, hypo-gravity (0 to 1 g), and hyper-gravity (1 to 2 g) during a parabolic flight. Gastrocnemius medialis (GM) electromyographic activity and fascicle length (Lf) were measured at drop-off, ground contact (GC), minimum ankle joint angle (MAJ), and push-off. GM sarcomere number was estimated by dividing Lf, measured by ultrasound at rest, by published data on GM sarcomere length, and measured in vivo at the same joint angle. Changes in sarcomere length were estimated by dividing GM Lf in each jump phase by sarcomere number calculated individually. The sarcomere force-generating capacity in each jump phase was estimated from the sarcomere length-tension relationship previously reported in the literature. Results: The results showed that, regardless of the gravity level, GM sarcomeres operated in the ascending portion of their length-tension relationship in all the jump phases. Interestingly, although in hypo-gravity and hyper-gravity during the braking phase (GC-MAJ) GM fascicles and sarcomeres experienced a stretch (as opposed to the quasi-isometric behavior in 1 g), at MAJ they reached similar lengths as in 1 g, allowing sarcomeres to develop about the 70% of their maximum force. Conclusion: The observed fascicle behavior during drop jumping seems useful for anchoring the tendon, enabling storage of elastic energy and its release in the subsequent push-off phase for effectively re-bouncing in all gravity levels, suggesting that an innate neuromuscular wisdom enables to perform SSC movements also in challenging conditions.

AB - Purpose: Fascicle and sarcomere lengths are important predictors of muscle mechanical performance. However, their regulation during stretch-shortening cycle (SSC) activities in usual and challenging conditions is poorly understood. In this study, we aimed to investigate muscle fascicle and sarcomere behavior during drop jumps (a common SSC activity) in conditions of variable gravity. Methods: Fifteen volunteers performed repeated drop jumps in 1 g, hypo-gravity (0 to 1 g), and hyper-gravity (1 to 2 g) during a parabolic flight. Gastrocnemius medialis (GM) electromyographic activity and fascicle length (Lf) were measured at drop-off, ground contact (GC), minimum ankle joint angle (MAJ), and push-off. GM sarcomere number was estimated by dividing Lf, measured by ultrasound at rest, by published data on GM sarcomere length, and measured in vivo at the same joint angle. Changes in sarcomere length were estimated by dividing GM Lf in each jump phase by sarcomere number calculated individually. The sarcomere force-generating capacity in each jump phase was estimated from the sarcomere length-tension relationship previously reported in the literature. Results: The results showed that, regardless of the gravity level, GM sarcomeres operated in the ascending portion of their length-tension relationship in all the jump phases. Interestingly, although in hypo-gravity and hyper-gravity during the braking phase (GC-MAJ) GM fascicles and sarcomeres experienced a stretch (as opposed to the quasi-isometric behavior in 1 g), at MAJ they reached similar lengths as in 1 g, allowing sarcomeres to develop about the 70% of their maximum force. Conclusion: The observed fascicle behavior during drop jumping seems useful for anchoring the tendon, enabling storage of elastic energy and its release in the subsequent push-off phase for effectively re-bouncing in all gravity levels, suggesting that an innate neuromuscular wisdom enables to perform SSC movements also in challenging conditions.

KW - parabolic flight

KW - drop jump

KW - hypo-gravity

KW - hyper-gravity

KW - sarcomere operating length

UR - https://www.mendeley.com/catalogue/a373ae6e-50a8-36c4-b2e5-a5cd28a01aa5/

U2 - 10.3389/fphys.2021.714655

DO - 10.3389/fphys.2021.714655

M3 - Journal articles

C2 - 34421657

VL - 12

SP - 1

EP - 19

JO - Frontiers in Physiology

JF - Frontiers in Physiology

SN - 1664-042X

M1 - 714655

ER -

ID: 6273760