Hensen, A.H.R. (2016) Differences between synchronous versus asynchronous submaximal handcycling in mechanical efficiency and force characteristics. thesis, Human Movement Sciences.
Full text available on request.Abstract
Objective: The aim of the study is to determine the mechanical efficiency of synchronous (SYNC) and asynchronous (ASYNC) handcycling. Additionally, characteristics of the forces applied to the handgrip between the two modes of propulsion will be studied. It is hypothesized that submaximal SYNC handcycling shows higher mechanical efficiency. No differences were expected in the mean mediolateral forces between SYNC and ASYNC. Methods: Twelve able-bodied males performed on both SYNC and ASYNC a pre-test, 3 intervention tests, and a post-test of each 3x4 min. handcycling on a motor-driven treadmill at a velocity of 1.94 ms-1 without additional resistance (+0W). Gear settings (0.632, 0.741 and 0.843) and additional resistance (+0W, +10W, +20W) were changed during the exercise intervention in a counter-balanced order. Half of the participants started in the SYNC mode, the others in the ASYNC mode. Three dimensional forces at the handle bar, oxygen consumption and mechanical efficiency (ME) were measured. Differences in these parameters between the two modes were determined by a paired sample t-test. Results: It was found that the ME in ASYNC was significantly lower than in SYNC handcycling. Radial forces in ASYNC handcycling were significantly higher than in SYNC handcycling. No differences between the two modes was found in mediolateral forces. Radial forces were found to be higher in asynchronous handcycling than in synchronous handcycling. Conclusion: As was hypothesized, lower ME values were found in ASYNC handcycling than in SYNC handcycling. No differences between the two modes was found in mediolateral forces. It is suggested that the higher radial forces are a result from the steering requirements and alternating character of the asynchronous movement.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Vegter, dr. R.J.K. and Woude, prof. dr. L.H.V. van der |
| Faculty: | Medical Sciences |
| Date Deposited: | 22 Apr 2022 12:28 |
| Last Modified: | 22 Apr 2022 12:28 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3145 |
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