Research into cycling pedaling techniques suggests that common assumptions about optimal form may be counterproductive. Studies indicate that cyclists who rely more on hip extension rather than knee extension, and who reduce pressure on the handlebars, exhibit higher lactate thresholds and greater metabolic efficiency. This approach appears to engage a larger muscle mass, distributing the workload and reducing stress on individual muscle fibers, leading to improved performance and endurance.

Introduction to Cycling Groups and Pedaling Techniques

Two groups of cyclists with equivalent lactate thresholds during uphill treadmill running exhibited differing lactate thresholds when cycling. The group with a higher cycling lactate threshold utilized their hips more extensively, while the other group relied more on knee extension. Professor Jim Martin, from the University of Utah's neuromuscular function lab, uses cycling as a model for investigations, focusing on the underlying physiological mechanisms rather than the sport of cycling itself.

Biomechanics and Muscle Physiology in Cycling

Research in cycling biomechanics and muscle physiology offers the freedom to explore unconventional study designs. These investigations often yield significant insights relevant to cycling performance. The speaker, a former competitive cyclist, achieved national and state sprint championships, though now views his past performance as passionate rather than elite.

Pedaling technique is a central area of study within cycling. Numerous articles address this topic, suggesting a broad interest in optimizing how cyclists apply force to the pedals.

Research on Pedaling Technique and Biomechanics

Studies indicate that cyclists can alter their pedaling technique when given specific instructions. Research by Tom Corf at Brunell University in London and by Morno in France, both published concurrently, investigated this phenomenon. In both studies, cyclists were able to modify their pedaling actions according to instructions. However, this change resulted in decreased metabolic efficiency, characterized by higher heart rates, increased breathing, and greater oxygen consumption. This outcome contradicts the common assumption that these modified techniques are more effective. The likely reason for this reduced efficiency is the complex interplay of the neuromuscular system, with the spinal cord playing a significant role in regulating pedaling.

The Role of the Spinal Cord in Pedaling

The spinal cord normally controls pedaling. Attempts to improve pedaling technique beyond this natural control may not yield further improvements. Two studies, building upon the work of Corf and Morno, explore this area.

Study by Herszog in Canada

Herszog conducted a study in Canada involving participants performing maximum isometric contractions while seated on a stationary bicycle. Participants held the crank stationary and exerted maximal force at various crank angles. The study measured the force applied, noting that some of this force was perpendicular to the crank, thus causing rotation.

Maximum Effort Pedaling

When cyclists push as hard as possible, directing their force perpendicular to the crank is the assumed optimal technique. However, research indicates that cyclists produce more force when they simply push, rather than when they attempt to direct that force. This finding is counterintuitive, as one would expect directing force to result in greater torque. Instead, cyclists generated more perpendicular force when they focused solely on pushing. This suggests the complexity of the leg's biomechanics during pedaling.

Hip Extension Action in Pedaling

The hip extension action in pedaling involves multiple joints and muscles. Muscles such as the hamstrings span both the hip and knee joints, while the gastrocnemius spans the ankle and knee. This complexity contributes to the inefficiency of certain pedaling techniques.

Reactions to Research Findings

Some individuals expressed that while they could perform the instructed pedaling techniques, they lacked the practice to do so efficiently. They suggested that with extended training periods, such as one to six months or even five years, their performance and efficiency would significantly improve. This feedback highlights the limitation of acute laboratory studies where participants perform novel techniques for a short duration.

Case Study: Femoral Amputee with Bone Cancer

A subject with a femoral amputation due to bone cancer, lacking a residual limb, was studied. This individual demonstrated high fitness levels and significant speed. The subject was invited to a laboratory setting to analyze their metabolic cost during cycling.

Efficiency in Cycling

A seven-year post-amputation subject, who had presumably mastered his pedaling technique, demonstrated low efficiency. When tested, his efficiency was nearly identical to cyclists instructed to pull up during their pedal stroke. This finding suggests that the pedaling technique itself, rather than adaptation to amputation, may be a significant factor in efficiency.

Practical Application of Cycling Techniques

Research in a laboratory setting using single-leg cycling with a counterweight on the opposite crank demonstrated that cyclists' hip flexors fatigue quickly without assistance. When this counterweight was applied, one subject's cycling efficiency increased by approximately 11%. This increase mirrored the decrease in efficiency observed in cyclists instructed to actively pull up on the pedals. When pedaling normally, this subject achieved efficiency comparable to other cyclists. However, when mimicking the instructed pulling motion, their efficiency became comparable to those who were less efficient. This suggests that providing instructions on how to pedal can negatively impact efficiency.

Local Cycling Insights

A local cycling course was observed to teach efficient pedaling techniques. Participants in this course frequently experienced issues such as Achilles tendon pain and calf cramps.

Inherent Qualities of Cycling

The concept of a "perfect pedal stroke" may be inherently flawed. Analysis of cyclists, such as during a helicopter shot at a competition like the World Championships or the Tour of Lombardy, can reveal insights into pedaling mechanics on inclines.

Demi Volerin and Cycling Myths

Demi Volerin reportedly exhibited an exceptionally fluid pedal stroke. This observation raises the question of whether certain pedal stroke characteristics inherently signify greater efficiency. Research conducted approximately 20 years prior to the current discussion had already challenged the notion of a single, universally more efficient pedal stroke. Despite these earlier findings, articles continue to be published that seek to identify a "perfect" pedal stroke.

The Persistence of Cultural Myths

Cultural myths are resistant to change. This observation sets the stage for discussing seemingly unrelated topics. Brian Liry completed his PhD under Ed Coyle at the University of Texas and is now affiliated with the medical school there.

Research from the University of West Virginia

A study conducted at the University of West Virginia identified two groups of cyclists. Both groups demonstrated the same lactate threshold when running uphill on a treadmill.

Similarities to General Cycling Actions

Biomechanical analysis revealed that cyclists with a higher lactate threshold exhibited differences in their pedaling technique compared to those with a lower threshold, despite having similar overall fitness levels. This suggests that variations in pedaling mechanics contribute to differences in metabolic cost and lactate threshold.

The Role of Hip Extension in Cycling

One group of cyclists utilized hip extension more effectively during pedaling, while another group relied more on knee extension. This difference suggests a shift from quad-dominant effort to hip-dominant recruitment. This approach likely contributes to a lower metabolic stress and an increased lactate threshold. The underlying mechanism is the recruitment of a larger muscle mass, distributing the workload more broadly. Consequently, individual muscle fibers experience less stress.

Hypothetical Scenarios in Cycling Mechanics

Cyclists who engaged their hips in the pedaling motion experienced a higher lactate threshold. This suggests that incorporating more muscle mass into the action, similar to a whole-body activity like rowing, leads to greater efficiency. This observation aligns with the principle that a broader muscular engagement can support a higher lactate threshold.

Efficiency vs. Work Distribution

Distributing work across multiple muscles can lead to a less stressful experience for any single muscle group. This distribution may allow for more muscles to buffer lactate.

Spreading the Workload in Cycling

Distributing pedaling effort across more muscle mass reduces the stress on any single muscle fiber. This distribution also leads to lower lactate production. Cyclists should not be instructed on how to pedal, but rather encouraged to adopt techniques that improve their performance.

Data from Ernie

Ernie's dissertation data was presented. A demonstration involved holding a phone with two forces, resting on thumbs, to represent a torso.

Supporting the Pedaling Action

When a torque is applied to lift the torso, this same torque extends the hip and thigh. This occurs because muscles span the joint, creating torque on both sides. Ernie's study involved bringing cyclists in to measure their biomechanics during normal pedaling.

Measuring Power Output (Watts)

Researchers measured the power output of cyclists in watts. During these measurements, discussions of pedaling technique were explicitly forbidden. This approach allowed for the assessment of self-selected pedaling techniques without external influence.

Comparing Normal Pedaling to Experimental Conditions

Researchers instructed participants to reduce the weight they applied to the handlebars during pedaling. This modification was implemented to compare this experimental condition against normal pedaling mechanics.

Pelvic Rotation in Pedaling

Research indicates that cyclists can improve their hip extension power by unweighting the handlebars. This action allows for a slight rotation of the pelvis. When cyclists successfully unweighted the bars, they dramatically improved the percentage of power generated by hip extension.

Power Generated by Hip Extension

The hip extension action produces power. By unweighting the hands, cyclists are encouraged to pedal more with their hips. This approach was applied to subjects with a high lactate threshold, as studied by Brian Liry.

Decision Making in Research

Researchers chose not to measure lactate threshold during testing. This decision was based on the confidence that participants unfamiliar with specific training techniques would not be able to sustain the required effort for the 15-minute duration of the test. Instead, the study proceeded with alternative measurements. The results presented show riders' self-selected pedaling techniques, indicated by black squares. The x-axis of the data represents the proportion of rider weight.

Support During the Pedaling Stroke

Researchers measured the amount of work contributed by hip extension during the pedaling stroke. This analysis focused on how cyclists supported themselves on the handlebars. The data indicated the proportion of total work derived from hip extension.

Understanding R-squared Values

The R-squared value indicates the proportion of variance in the dependent variable that is predictable from the independent variable(s). In this context, it quantifies how much of the "noise" or variability in the data is explained by the other measured variable. Specifically, it was stated that 61% of the hip work performed is accounted for by the independent variable.

Influence of Body Lean on Pedaling

The degree to which a cyclist leans on the handlebars influences their self-selected pedaling technique. This observation is based on data where black dots represent an unweighted condition.

Correlation and Self-Selection

The amount of hip work performed during pedaling is correlated with the force applied to the handlebars. This correlation holds true whether cyclists are pedaling normally or when asked to unweight their bodies. In self-selected pedaling, this relationship is particularly strong.

Data indicates that the weight applied to the handlebars accounts for approximately 72% of the variance in pedaling mechanics. This suggests that the distribution of effort between the legs and upper body, influenced by handlebar pressure, is a significant factor in pedaling technique. Researchers hypothesize that this self-selection of effort distribution may explain findings in other studies, such as those differentiating between high and low lactate threshold groups.

Relative Work and Technique

The amount of relative work performed by the hip joint is a key factor in pedaling technique. While detailed biomechanics data may seem esoteric, it informs understanding of cycling actions. It is hypothesized that when cyclists unweight their hands, they are utilizing spinal cord level motor programs, which can be understood as natural coordination.

Muscular Engagement

Using the hip joint during pedaling increases muscular engagement. This technique can be elicited without explicit instruction on pedaling mechanics. The plural of anecdote is not data, but anecdotal evidence can still be informative.

Riding Stories

Recent personal records on Strava were achieved this year by adopting a riding technique characterized by "floppy elbows." This approach involves placing minimal weight on the handlebars, allowing the elbows to remain relaxed. This observation was made early in the spring riding season.

Riding Habits and Intuition

The speaker recounts an experience of riding without extensive prior practice. This approach resulted in faster ascents and a notable absence of thigh burning, which is typically experienced. An exception occurred on a steep incline where, upon intuitively standing, immediate thigh discomfort was felt. This anecdote illustrates a personal observation regarding pedaling technique and physical sensation.

Group Rides and Performance

A cyclist who previously risked being dropped on climbs now maintains position at the front of the group. This improvement is associated with adopting a pedaling technique that includes "floppy elbows." When this technique is employed, the cyclist is no longer dropped on climbs.

Age and Racing

A 60-year-old cyclist is still competing in Open Cat 3 races and winning. This individual, who is part of a high lactate threshold (LT) group, claims his hands have never gone numb while cycling. While this is an anecdote and not scientific data, it suggests a potential correlation between specific pedaling techniques and comfort during prolonged cycling.

Group Dynamics

Research findings suggest that techniques identified by Liry can effectively support pedaling. In personal experience, these techniques represent a significant improvement.

Favorite Climbs

The technique of riding with "floppy elbows" can make it easier to unweight the handlebars. This technique may also engage more muscle mass, potentially improving performance. Heavy squats performed during winter training can strengthen the hip extension action, which may help cyclists maintain this technique for longer durations.

This approach could be particularly beneficial for time trialists using time trial bars. In one study, participants using time trial bars produced most of their power through knee extension when leaning heavily. When they unweighted their arms, they utilized hip extension more. Anecdotal evidence suggests that maintaining 250 watts was difficult with heavily weighted elbows, and also challenging with unweighted elbows, indicating a potential difficulty in adjusting power output in these positions.

Cyclists can test this technique by intentionally riding with relaxed elbows on their favorite climbs. This approach may reduce stress and potentially improve performance. A less aggressive front-end bike fit, which prioritizes comfort and sustained riding position over marginal aerodynamic gains, may facilitate the use of floppy elbows and a more relaxed riding posture.

In Ernie's study, all testing was conducted in the drops with shoulders remaining in the same position, only reducing weight support on the arms. A method to normalize arm position involves using moldable plastic to create a consistent elbow position. This would require cyclists to actively engage their core and shift weight to unweight their arms while maintaining the same arm position. This technique emphasizes core engagement rather than a change in pedaling mechanics.

Anecdotal reports suggest that the floppy elbow technique can be maintained for at least 12 minutes without issue, especially for individuals who have incorporated squatting into their training. Further research is planned, potentially with a graduate student who is an avid cyclist and mountain biker. This student has reported positive results with floppy elbows on climbs.